WifiWatchdogStateMachine.java revision edba852930bd2e9ab41f74f340595dafe500c756
1654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy/* 2654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy * Copyright (C) 2011 The Android Open Source Project 3654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy * 4654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy * Licensed under the Apache License, Version 2.0 (the "License"); 5654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy * you may not use this file except in compliance with the License. 6654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy * You may obtain a copy of the License at 7654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy * 8654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy * http://www.apache.org/licenses/LICENSE-2.0 9654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy * 10654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy * Unless required by applicable law or agreed to in writing, software 11654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy * distributed under the License is distributed on an "AS IS" BASIS, 12654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy * See the License for the specific language governing permissions and 14654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy * limitations under the License. 15654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy */ 16654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 17654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levypackage android.net.wifi; 18654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 19654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levyimport android.content.BroadcastReceiver; 20654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levyimport android.content.ContentResolver; 21654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levyimport android.content.Context; 22654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levyimport android.content.Intent; 23654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levyimport android.content.IntentFilter; 24654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levyimport android.database.ContentObserver; 25654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levyimport android.net.ConnectivityManager; 2607573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriffimport android.net.LinkProperties; 27654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levyimport android.net.NetworkInfo; 28f6307820c88e694e102824225b9d8caa6de75a30Yuhao Zhengimport android.net.wifi.RssiPacketCountInfo; 29654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levyimport android.os.Message; 30654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levyimport android.os.SystemClock; 31654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levyimport android.provider.Settings; 32d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levyimport android.provider.Settings.Secure; 339b2886e24301e5d4e7052ec4a6eaff273d3f516cRobert Greenwaltimport android.util.Log; 34b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zhengimport android.util.LruCache; 35654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 366b66e9e4c95b1c866ea63a0122fc199994fd7053Irfan Sheriffimport com.android.internal.R; 3707573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriffimport com.android.internal.util.AsyncChannel; 38654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levyimport com.android.internal.util.Protocol; 39654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levyimport com.android.internal.util.State; 40654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levyimport com.android.internal.util.StateMachine; 41654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 42654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levyimport java.io.PrintWriter; 43b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zhengimport java.text.DecimalFormat; 44654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 45654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy/** 46b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * WifiWatchdogStateMachine monitors the connection to a WiFi network. When WiFi 47b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * connects at L2 layer, the beacons from access point reach the device and it 48b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * can maintain a connection, but the application connectivity can be flaky (due 49b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * to bigger packet size exchange). 50b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 51b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * We now monitor the quality of the last hop on WiFi using packet loss ratio as 52b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * an indicator to decide if the link is good enough to switch to Wi-Fi as the 53b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * uplink. 54b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 55b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * When WiFi is connected, the WiFi watchdog keeps sampling the RSSI and the 56b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * instant packet loss, and record it as per-AP loss-to-rssi statistics. When 57b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * the instant packet loss is higher than a threshold, the WiFi watchdog sends a 58b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * poor link notification to avoid WiFi connection temporarily. 59b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 60b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * While WiFi is being avoided, the WiFi watchdog keep watching the RSSI to 61b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * bring the WiFi connection back. Once the RSSI is high enough to achieve a 62b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * lower packet loss, a good link detection is sent such that the WiFi 63b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * connection become available again. 64b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 65b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * BSSID roaming has been taken into account. When user is moving across 66b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * multiple APs, the WiFi watchdog will detect that and keep watching the 67b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * currently connected AP. 68b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 69b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Power impact should be minimal since much of the measurement relies on 70b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * passive statistics already being tracked at the driver and the polling is 71b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * done when screen is turned on and the RSSI is in a certain range. 72654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy * 73654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy * @hide 74654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy */ 75654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levypublic class WifiWatchdogStateMachine extends StateMachine { 76654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 7707573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff /* STOPSHIP: Keep this configurable for debugging until ship */ 7807573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff private static boolean DBG = false; 797f8a12c75cf2b376fce58fc22b5ecb1b64acf110Irfan Sheriff private static final String TAG = "WifiWatchdogStateMachine"; 80654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 81b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final int BASE = Protocol.BASE_WIFI_WATCHDOG; 82654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 83b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /* Internal events */ 84b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final int EVENT_WATCHDOG_TOGGLED = BASE + 1; 85b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final int EVENT_NETWORK_STATE_CHANGE = BASE + 2; 86b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final int EVENT_RSSI_CHANGE = BASE + 3; 87b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final int EVENT_SUPPLICANT_STATE_CHANGE = BASE + 4; 88b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final int EVENT_WIFI_RADIO_STATE_CHANGE = BASE + 5; 89b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final int EVENT_WATCHDOG_SETTINGS_CHANGE = BASE + 6; 90b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final int EVENT_BSSID_CHANGE = BASE + 7; 91b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final int EVENT_SCREEN_ON = BASE + 8; 92b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final int EVENT_SCREEN_OFF = BASE + 9; 93654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 94b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /* Internal messages */ 95da6da0907b28d4704aabbdb1bbeb4300954670d1Irfan Sheriff private static final int CMD_RSSI_FETCH = BASE + 11; 96654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 97b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /* Notifications from/to WifiStateMachine */ 98b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng static final int POOR_LINK_DETECTED = BASE + 21; 99b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng static final int GOOD_LINK_DETECTED = BASE + 22; 100b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 10117cf1f2bbc3f7d4f367dbbee935d2939957c0ef6Irfan Sheriff public static final boolean DEFAULT_POOR_NETWORK_AVOIDANCE_ENABLED = false; 10217cf1f2bbc3f7d4f367dbbee935d2939957c0ef6Irfan Sheriff 103b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /* 104b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * RSSI levels as used by notification icon 105b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Level 4 -55 <= RSSI 106b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Level 3 -66 <= RSSI < -55 107b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Level 2 -77 <= RSSI < -67 108b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Level 1 -88 <= RSSI < -78 109b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Level 0 RSSI < -88 110b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 111d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy 112b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 113b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * WiFi link statistics is monitored and recorded actively below this threshold. 114b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 115b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Larger threshold is more adaptive but increases sampling cost. 116b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 117f6307820c88e694e102824225b9d8caa6de75a30Yuhao Zheng private static final int LINK_MONITOR_LEVEL_THRESHOLD = WifiManager.RSSI_LEVELS - 1; 118d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy 119b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 120b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Remember packet loss statistics of how many BSSIDs. 121b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 122b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Larger size is usually better but requires more space. 123b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 124b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final int BSSID_STAT_CACHE_SIZE = 20; 125a81ac7c450d9d534c46abc7000cc53779a72c283Irfan Sheriff 126b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 127b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * RSSI range of a BSSID statistics. 128b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Within the range, (RSSI -> packet loss %) mappings are stored. 129b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 130b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Larger range is usually better but requires more space. 131a81ac7c450d9d534c46abc7000cc53779a72c283Irfan Sheriff */ 132b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final int BSSID_STAT_RANGE_LOW_DBM = -105; 133a81ac7c450d9d534c46abc7000cc53779a72c283Irfan Sheriff 134b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 135b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * See {@link #BSSID_STAT_RANGE_LOW_DBM}. 136b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 137b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final int BSSID_STAT_RANGE_HIGH_DBM = -45; 138654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 139654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy /** 140b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * How many consecutive empty data point to trigger a empty-cache detection. 141b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * In this case, a preset/default loss value (function on RSSI) is used. 142b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 143b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * In normal uses, some RSSI values may never be seen due to channel randomness. 144b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * However, the size of such empty RSSI chunk in normal use is generally 1~2. 145654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy */ 146b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final int BSSID_STAT_EMPTY_COUNT = 3; 147654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 148654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy /** 149b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Sample interval for packet loss statistics, in msec. 150b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 151b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Smaller interval is more accurate but increases sampling cost (battery consumption). 152654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy */ 153b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final long LINK_SAMPLING_INTERVAL_MS = 1 * 1000; 154654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 155b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 156b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Coefficients (alpha) for moving average for packet loss tracking. 157b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Must be within (0.0, 1.0). 158b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 159b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Equivalent number of samples: N = 2 / alpha - 1 . 160b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * We want the historic loss to base on more data points to be statistically reliable. 161b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * We want the current instant loss to base on less data points to be responsive. 162b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 163b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final double EXP_COEFFICIENT_RECORD = 0.1; 16407573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff 165b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 166b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * See {@link #EXP_COEFFICIENT_RECORD}. 167b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 168b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final double EXP_COEFFICIENT_MONITOR = 0.5; 169b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 170b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 171b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Thresholds for sending good/poor link notifications, in packet loss %. 172b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Good threshold must be smaller than poor threshold. 173b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Use smaller poor threshold to avoid WiFi more aggressively. 174b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Use smaller good threshold to bring back WiFi more conservatively. 175b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 176b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * When approaching the boundary, loss ratio jumps significantly within a few dBs. 177b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * 50% loss threshold is a good balance between accuracy and reponsiveness. 178b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <=10% good threshold is a safe value to avoid jumping back to WiFi too easily. 179b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 180b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final double POOR_LINK_LOSS_THRESHOLD = 0.5; 181b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 182b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 183b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * See {@link #POOR_LINK_LOSS_THRESHOLD}. 184b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 185b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final double GOOD_LINK_LOSS_THRESHOLD = 0.1; 186b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 187b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 188b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Number of samples to confirm before sending a poor link notification. 189b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Response time = confirm_count * sample_interval . 190b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 191b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * A smaller threshold improves response speed but may suffer from randomness. 192b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * According to experiments, 3~5 are good values to achieve a balance. 193b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * These parameters should be tuned along with {@link #LINK_SAMPLING_INTERVAL_MS}. 194b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 195b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final int POOR_LINK_SAMPLE_COUNT = 3; 196b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 197b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 198b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Minimum volume (converted from pkt/sec) to detect a poor link, to avoid randomness. 199b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 200b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * According to experiments, 1pkt/sec is too sensitive but 3pkt/sec is slightly unresponsive. 201b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 202b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final double POOR_LINK_MIN_VOLUME = 2.0 * LINK_SAMPLING_INTERVAL_MS / 1000.0; 203b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 204b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 205b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * When a poor link is detected, we scan over this range (based on current 206b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * poor link RSSI) for a target RSSI that satisfies a target packet loss. 207b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Refer to {@link #GOOD_LINK_TARGET}. 208b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 209b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * We want range_min not too small to avoid jumping back to WiFi too easily. 210b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 211b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final int GOOD_LINK_RSSI_RANGE_MIN = 3; 212b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 213b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 214b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * See {@link #GOOD_LINK_RSSI_RANGE_MIN}. 215b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 216b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final int GOOD_LINK_RSSI_RANGE_MAX = 20; 217b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 218b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 219b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Adaptive good link target to avoid flapping. 220b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * When a poor link is detected, a good link target is calculated as follows: 221b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 222f6307820c88e694e102824225b9d8caa6de75a30Yuhao Zheng * targetRSSI = min { rssi | loss(rssi) < GOOD_LINK_LOSS_THRESHOLD } + rssi_adj[i], 223f6307820c88e694e102824225b9d8caa6de75a30Yuhao Zheng * where rssi is within the above GOOD_LINK_RSSI_RANGE. 224b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * targetCount = sample_count[i] . 225b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 226b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * While WiFi is being avoided, we keep monitoring its signal strength. 227b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Good link notification is sent when we see current RSSI >= targetRSSI 228b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * for targetCount consecutive times. 229b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 230b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Index i is incremented each time after a poor link detection. 231b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Index i is decreased to at most k if the last poor link was at lease reduce_time[k] ago. 232b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 233b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Intuitively, larger index i makes it more difficult to get back to WiFi, avoiding flapping. 234b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * In experiments, (+9 dB / 30 counts) makes it quite difficult to achieve. 235f6307820c88e694e102824225b9d8caa6de75a30Yuhao Zheng * Avoid using it unless flapping is really bad (say, last poor link is < 1 min ago). 236b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 237b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final GoodLinkTarget[] GOOD_LINK_TARGET = { 238b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /* rssi_adj, sample_count, reduce_time */ 239b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng new GoodLinkTarget( 0, 3, 30 * 60000 ), 240b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng new GoodLinkTarget( 3, 5, 5 * 60000 ), 241b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng new GoodLinkTarget( 6, 10, 1 * 60000 ), 242b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng new GoodLinkTarget( 9, 30, 0 * 60000 ), 243b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng }; 244b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 245b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 246b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * The max time to avoid a BSSID, to prevent avoiding forever. 247b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * If current RSSI is at least min_rssi[i], the max avoidance time is at most max_time[i] 248b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 249b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * It is unusual to experience high packet loss at high RSSI. Something unusual must be 250b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * happening (e.g. strong interference). For higher signal strengths, we set the avoidance 251b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * time to be low to allow for quick turn around from temporary interference. 252b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * <p> 253b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * See {@link BssidStatistics#poorLinkDetected}. 254b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 255b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static final MaxAvoidTime[] MAX_AVOID_TIME = { 256b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /* max_time, min_rssi */ 257b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng new MaxAvoidTime( 30 * 60000, -200 ), 258b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng new MaxAvoidTime( 5 * 60000, -70 ), 259b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng new MaxAvoidTime( 0 * 60000, -55 ), 260b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng }; 261b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 262b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /* Framework related */ 263654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy private Context mContext; 264654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy private ContentResolver mContentResolver; 265654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy private WifiManager mWifiManager; 266654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy private IntentFilter mIntentFilter; 267654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy private BroadcastReceiver mBroadcastReceiver; 268b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private AsyncChannel mWsmChannel = new AsyncChannel(); 269b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private WifiInfo mWifiInfo; 270b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private LinkProperties mLinkProperties; 271b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 272b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /* System settingss related */ 273b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static boolean sWifiOnly = false; 274b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private boolean mPoorNetworkDetectionEnabled; 275b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 276b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /* Poor link detection related */ 277b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private LruCache<String, BssidStatistics> mBssidCache = 278b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng new LruCache<String, BssidStatistics>(BSSID_STAT_CACHE_SIZE); 279b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private int mRssiFetchToken = 0; 280b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private int mCurrentSignalLevel; 281b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private BssidStatistics mCurrentBssid; 282b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private VolumeWeightedEMA mCurrentLoss; 283b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private boolean mIsScreenOn = true; 284b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static double sPresetLoss[]; 285b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 286b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /* WiFi watchdog state machine related */ 287654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy private DefaultState mDefaultState = new DefaultState(); 288654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy private WatchdogDisabledState mWatchdogDisabledState = new WatchdogDisabledState(); 289654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy private WatchdogEnabledState mWatchdogEnabledState = new WatchdogEnabledState(); 290654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy private NotConnectedState mNotConnectedState = new NotConnectedState(); 29107573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff private VerifyingLinkState mVerifyingLinkState = new VerifyingLinkState(); 292654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy private ConnectedState mConnectedState = new ConnectedState(); 293654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy private OnlineWatchState mOnlineWatchState = new OnlineWatchState(); 294b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private LinkMonitoringState mLinkMonitoringState = new LinkMonitoringState(); 29519380daaf46815c80bd89fd9ca3af3c4095952b5Irfan Sheriff private OnlineState mOnlineState = new OnlineState(); 296654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 297654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy /** 298654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy * STATE MAP 299654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy * Default 300654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy * / \ 30107573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff * Disabled Enabled 30207573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff * / \ \ 30307573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff * NotConnected Verifying Connected 30407573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff * /---------\ 30507573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff * (all other states) 306654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy */ 307654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy private WifiWatchdogStateMachine(Context context) { 3087f8a12c75cf2b376fce58fc22b5ecb1b64acf110Irfan Sheriff super(TAG); 309654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy mContext = context; 310654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy mContentResolver = context.getContentResolver(); 311654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE); 31207573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff mWsmChannel.connectSync(mContext, getHandler(), 31307573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff mWifiManager.getWifiStateMachineMessenger()); 314654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 315654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy setupNetworkReceiver(); 316654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 317b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // the content observer to listen needs a handler 318654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy registerForSettingsChanges(); 319d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy registerForWatchdogToggle(); 320654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy addState(mDefaultState); 321654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy addState(mWatchdogDisabledState, mDefaultState); 322654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy addState(mWatchdogEnabledState, mDefaultState); 323654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy addState(mNotConnectedState, mWatchdogEnabledState); 32407573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff addState(mVerifyingLinkState, mWatchdogEnabledState); 325654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy addState(mConnectedState, mWatchdogEnabledState); 326654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy addState(mOnlineWatchState, mConnectedState); 327b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng addState(mLinkMonitoringState, mConnectedState); 32819380daaf46815c80bd89fd9ca3af3c4095952b5Irfan Sheriff addState(mOnlineState, mConnectedState); 329654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 33007573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff if (isWatchdogEnabled()) { 33107573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff setInitialState(mNotConnectedState); 33207573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff } else { 33307573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff setInitialState(mWatchdogDisabledState); 33407573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff } 335d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy updateSettings(); 336654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 337654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 338654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy public static WifiWatchdogStateMachine makeWifiWatchdogStateMachine(Context context) { 3394ad39d6ac16961df0e7a3e4b4e7075aaa5202787Isaac Levy ContentResolver contentResolver = context.getContentResolver(); 3409b2886e24301e5d4e7052ec4a6eaff273d3f516cRobert Greenwalt 3419b2886e24301e5d4e7052ec4a6eaff273d3f516cRobert Greenwalt ConnectivityManager cm = (ConnectivityManager) context.getSystemService( 3429b2886e24301e5d4e7052ec4a6eaff273d3f516cRobert Greenwalt Context.CONNECTIVITY_SERVICE); 3439b2886e24301e5d4e7052ec4a6eaff273d3f516cRobert Greenwalt sWifiOnly = (cm.isNetworkSupported(ConnectivityManager.TYPE_MOBILE) == false); 3449b2886e24301e5d4e7052ec4a6eaff273d3f516cRobert Greenwalt 345da6da0907b28d4704aabbdb1bbeb4300954670d1Irfan Sheriff // Watchdog is always enabled. Poor network detection can be seperately turned on/off 346ae094b27159864cb47015b96d18c5d32ef84fdc1Irfan Sheriff // TODO: Remove this setting & clean up state machine since we always have 347ae094b27159864cb47015b96d18c5d32ef84fdc1Irfan Sheriff // watchdog in an enabled state 348bdfce2ec05a3e9ca6acd6711de6133e06f2446e6Jeff Sharkey putSettingsGlobalBoolean(contentResolver, Settings.Global.WIFI_WATCHDOG_ON, true); 349ae094b27159864cb47015b96d18c5d32ef84fdc1Irfan Sheriff 350654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy WifiWatchdogStateMachine wwsm = new WifiWatchdogStateMachine(context); 351654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy wwsm.start(); 352654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy return wwsm; 353654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 354654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 355654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy private void setupNetworkReceiver() { 356654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy mBroadcastReceiver = new BroadcastReceiver() { 357654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy @Override 358654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy public void onReceive(Context context, Intent intent) { 359654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy String action = intent.getAction(); 360b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (action.equals(WifiManager.RSSI_CHANGED_ACTION)) { 36107573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff obtainMessage(EVENT_RSSI_CHANGE, 36207573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff intent.getIntExtra(WifiManager.EXTRA_NEW_RSSI, -200), 0).sendToTarget(); 363b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } else if (action.equals(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION)) { 364b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng sendMessage(EVENT_SUPPLICANT_STATE_CHANGE, intent); 365b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } else if (action.equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)) { 366b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng sendMessage(EVENT_NETWORK_STATE_CHANGE, intent); 367b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } else if (action.equals(Intent.ACTION_SCREEN_ON)) { 368b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng sendMessage(EVENT_SCREEN_ON); 369b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } else if (action.equals(Intent.ACTION_SCREEN_OFF)) { 370b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng sendMessage(EVENT_SCREEN_OFF); 371654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } else if (action.equals(WifiManager.WIFI_STATE_CHANGED_ACTION)) { 372b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng sendMessage(EVENT_WIFI_RADIO_STATE_CHANGE,intent.getIntExtra( 373b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng WifiManager.EXTRA_WIFI_STATE, WifiManager.WIFI_STATE_UNKNOWN)); 374654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 375654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 376654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy }; 377654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 378654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy mIntentFilter = new IntentFilter(); 379654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy mIntentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION); 380654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy mIntentFilter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION); 381654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy mIntentFilter.addAction(WifiManager.RSSI_CHANGED_ACTION); 382b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mIntentFilter.addAction(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION); 383b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mIntentFilter.addAction(Intent.ACTION_SCREEN_ON); 384b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mIntentFilter.addAction(Intent.ACTION_SCREEN_OFF); 38507573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff mContext.registerReceiver(mBroadcastReceiver, mIntentFilter); 386654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 387654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 388654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy /** 389654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy * Observes the watchdog on/off setting, and takes action when changed. 390654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy */ 391d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy private void registerForWatchdogToggle() { 392654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy ContentObserver contentObserver = new ContentObserver(this.getHandler()) { 393654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy @Override 394654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy public void onChange(boolean selfChange) { 395654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy sendMessage(EVENT_WATCHDOG_TOGGLED); 396654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 397654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy }; 398654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 399654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy mContext.getContentResolver().registerContentObserver( 400bdfce2ec05a3e9ca6acd6711de6133e06f2446e6Jeff Sharkey Settings.Global.getUriFor(Settings.Global.WIFI_WATCHDOG_ON), 401654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy false, contentObserver); 402654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 403654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 404654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy /** 405d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy * Observes watchdogs secure setting changes. 406d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy */ 407d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy private void registerForSettingsChanges() { 408d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy ContentObserver contentObserver = new ContentObserver(this.getHandler()) { 409d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy @Override 410d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy public void onChange(boolean selfChange) { 411d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy sendMessage(EVENT_WATCHDOG_SETTINGS_CHANGE); 412d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy } 413d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy }; 414d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy 415d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy mContext.getContentResolver().registerContentObserver( 416bdfce2ec05a3e9ca6acd6711de6133e06f2446e6Jeff Sharkey Settings.Global.getUriFor(Settings.Global.WIFI_WATCHDOG_POOR_NETWORK_TEST_ENABLED), 417d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy false, contentObserver); 418654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 419654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 420654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy public void dump(PrintWriter pw) { 421654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy pw.print("WatchdogStatus: "); 42207573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff pw.print("State: " + getCurrentState()); 42307573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff pw.println("mWifiInfo: [" + mWifiInfo + "]"); 42407573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff pw.println("mLinkProperties: [" + mLinkProperties + "]"); 42507573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff pw.println("mCurrentSignalLevel: [" + mCurrentSignalLevel + "]"); 42607573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff pw.println("mPoorNetworkDetectionEnabled: [" + mPoorNetworkDetectionEnabled + "]"); 427654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 428654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 429654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy private boolean isWatchdogEnabled() { 430bdfce2ec05a3e9ca6acd6711de6133e06f2446e6Jeff Sharkey boolean ret = getSettingsGlobalBoolean( 431bdfce2ec05a3e9ca6acd6711de6133e06f2446e6Jeff Sharkey mContentResolver, Settings.Global.WIFI_WATCHDOG_ON, true); 432b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd("Watchdog enabled " + ret); 4334c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff return ret; 434654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 435654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 436d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy private void updateSettings() { 437b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd("Updating secure settings"); 438b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 439bbe461b78f9697775281d986bcf3c00904e1e62cIrfan Sheriff // disable poor network avoidance 440bbe461b78f9697775281d986bcf3c00904e1e62cIrfan Sheriff if (sWifiOnly) { 441bbe461b78f9697775281d986bcf3c00904e1e62cIrfan Sheriff logd("Disabling poor network avoidance for wi-fi only device"); 442bbe461b78f9697775281d986bcf3c00904e1e62cIrfan Sheriff mPoorNetworkDetectionEnabled = false; 443bbe461b78f9697775281d986bcf3c00904e1e62cIrfan Sheriff } else { 444bbe461b78f9697775281d986bcf3c00904e1e62cIrfan Sheriff mPoorNetworkDetectionEnabled = getSettingsGlobalBoolean(mContentResolver, 44517cf1f2bbc3f7d4f367dbbee935d2939957c0ef6Irfan Sheriff Settings.Global.WIFI_WATCHDOG_POOR_NETWORK_TEST_ENABLED, 44617cf1f2bbc3f7d4f367dbbee935d2939957c0ef6Irfan Sheriff DEFAULT_POOR_NETWORK_AVOIDANCE_ENABLED); 447bbe461b78f9697775281d986bcf3c00904e1e62cIrfan Sheriff } 4488dc6a1b2823f374a176fb21b8a174664a5f825faIsaac Levy } 4498dc6a1b2823f374a176fb21b8a174664a5f825faIsaac Levy 450b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 451b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Default state, guard for unhandled messages. 452b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 453654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy class DefaultState extends State { 454654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy @Override 4554c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff public void enter() { 456b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd(getName()); 4574c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff } 4584c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff 4594c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff @Override 460654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy public boolean processMessage(Message msg) { 461d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy switch (msg.what) { 462d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy case EVENT_WATCHDOG_SETTINGS_CHANGE: 463d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy updateSettings(); 464b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd("Updating wifi-watchdog secure settings"); 46507573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff break; 46607573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff case EVENT_RSSI_CHANGE: 4674c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff mCurrentSignalLevel = calculateSignalLevel(msg.arg1); 46807573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff break; 46907573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff case EVENT_WIFI_RADIO_STATE_CHANGE: 47007573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff case EVENT_NETWORK_STATE_CHANGE: 471b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng case EVENT_SUPPLICANT_STATE_CHANGE: 472b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng case EVENT_BSSID_CHANGE: 4734c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff case CMD_RSSI_FETCH: 474f6307820c88e694e102824225b9d8caa6de75a30Yuhao Zheng case WifiManager.RSSI_PKTCNT_FETCH_SUCCEEDED: 475f6307820c88e694e102824225b9d8caa6de75a30Yuhao Zheng case WifiManager.RSSI_PKTCNT_FETCH_FAILED: 476b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // ignore 477b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng break; 478b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng case EVENT_SCREEN_ON: 479b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mIsScreenOn = true; 480b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng break; 481b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng case EVENT_SCREEN_OFF: 482b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mIsScreenOn = false; 48307573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff break; 48407573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff default: 485b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng loge("Unhandled message " + msg + " in state " + getCurrentState().getName()); 48607573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff break; 487654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 488654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy return HANDLED; 489654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 490654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 491654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 492b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 493b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * WiFi watchdog is disabled by the setting. 494b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 495654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy class WatchdogDisabledState extends State { 496654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy @Override 4974c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff public void enter() { 498b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd(getName()); 4994c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff } 5004c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff 5014c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff @Override 502654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy public boolean processMessage(Message msg) { 503654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy switch (msg.what) { 504654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy case EVENT_WATCHDOG_TOGGLED: 505654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy if (isWatchdogEnabled()) 506654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy transitionTo(mNotConnectedState); 507654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy return HANDLED; 50807573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff case EVENT_NETWORK_STATE_CHANGE: 50907573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff Intent intent = (Intent) msg.obj; 51007573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff NetworkInfo networkInfo = (NetworkInfo) 51107573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO); 51207573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff 51307573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff switch (networkInfo.getDetailedState()) { 51407573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff case VERIFYING_POOR_LINK: 515b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd("Watchdog disabled, verify link"); 516b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng sendLinkStatusNotification(true); 51707573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff break; 51807573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff default: 51907573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff break; 52007573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff } 52107573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff break; 522654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 523654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy return NOT_HANDLED; 524654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 525654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 526654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 527b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 528b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * WiFi watchdog is enabled by the setting. 529b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 530654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy class WatchdogEnabledState extends State { 531654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy @Override 532654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy public void enter() { 533b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd(getName()); 5344c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff } 535654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 536654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy @Override 537654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy public boolean processMessage(Message msg) { 538b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng Intent intent; 539654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy switch (msg.what) { 540654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy case EVENT_WATCHDOG_TOGGLED: 541654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy if (!isWatchdogEnabled()) 542654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy transitionTo(mWatchdogDisabledState); 54307573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff break; 544b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 545654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy case EVENT_NETWORK_STATE_CHANGE: 546b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng intent = (Intent) msg.obj; 547b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng NetworkInfo networkInfo = 548b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng (NetworkInfo) intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO); 549b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd("Network state change " + networkInfo.getDetailedState()); 55007573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff 551b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mWifiInfo = (WifiInfo) intent.getParcelableExtra(WifiManager.EXTRA_WIFI_INFO); 552b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng updateCurrentBssid(mWifiInfo != null ? mWifiInfo.getBSSID() : null); 5534c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff 55407573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff switch (networkInfo.getDetailedState()) { 55507573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff case VERIFYING_POOR_LINK: 55607573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff mLinkProperties = (LinkProperties) intent.getParcelableExtra( 55707573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff WifiManager.EXTRA_LINK_PROPERTIES); 55819380daaf46815c80bd89fd9ca3af3c4095952b5Irfan Sheriff if (mPoorNetworkDetectionEnabled) { 559edba852930bd2e9ab41f74f340595dafe500c756Irfan Sheriff if (mWifiInfo == null || mCurrentBssid == null) { 560edba852930bd2e9ab41f74f340595dafe500c756Irfan Sheriff loge("Ignore, wifiinfo " + mWifiInfo +" bssid " + mCurrentBssid); 561b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng sendLinkStatusNotification(true); 56207573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff } else { 56307573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff transitionTo(mVerifyingLinkState); 56407573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff } 56519380daaf46815c80bd89fd9ca3af3c4095952b5Irfan Sheriff } else { 566b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng sendLinkStatusNotification(true); 56707573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff } 56807573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff break; 56907573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff case CONNECTED: 570da6da0907b28d4704aabbdb1bbeb4300954670d1Irfan Sheriff transitionTo(mOnlineWatchState); 57132f04e9009046f72242932bf4e820802148e423aIrfan Sheriff break; 57232f04e9009046f72242932bf4e820802148e423aIrfan Sheriff default: 573654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy transitionTo(mNotConnectedState); 57432f04e9009046f72242932bf4e820802148e423aIrfan Sheriff break; 575654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 57607573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff break; 577b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 578b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng case EVENT_SUPPLICANT_STATE_CHANGE: 579b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng intent = (Intent) msg.obj; 580b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng SupplicantState supplicantState = (SupplicantState) intent.getParcelableExtra( 581b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng WifiManager.EXTRA_NEW_STATE); 582b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (supplicantState == SupplicantState.COMPLETED) { 583b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mWifiInfo = mWifiManager.getConnectionInfo(); 584b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng updateCurrentBssid(mWifiInfo.getBSSID()); 585b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 586b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng break; 587b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 588654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy case EVENT_WIFI_RADIO_STATE_CHANGE: 589b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if ((Integer) msg.obj == WifiManager.WIFI_STATE_DISABLING) 590654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy transitionTo(mNotConnectedState); 59107573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff break; 592b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 59307573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff default: 59407573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff return NOT_HANDLED; 595654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 596654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 59707573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff return HANDLED; 598654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 599654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 600654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 601b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 602b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * WiFi is disconnected. 603b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 604654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy class NotConnectedState extends State { 6054c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff @Override 6064c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff public void enter() { 607b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd(getName()); 6084c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff } 609654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 610654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 611b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 612b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * WiFi is connected, but waiting for good link detection message. 613b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 61407573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff class VerifyingLinkState extends State { 615b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 616b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private int mSampleCount; 617b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 61807573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff @Override 61907573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff public void enter() { 620b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd(getName()); 621b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mSampleCount = 0; 622b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mCurrentBssid.newLinkDetected(); 623b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng sendMessage(obtainMessage(CMD_RSSI_FETCH, ++mRssiFetchToken, 0)); 62407573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff } 62507573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff 626654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy @Override 627654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy public boolean processMessage(Message msg) { 628654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy switch (msg.what) { 629d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy case EVENT_WATCHDOG_SETTINGS_CHANGE: 63019380daaf46815c80bd89fd9ca3af3c4095952b5Irfan Sheriff updateSettings(); 63107573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff if (!mPoorNetworkDetectionEnabled) { 632b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng sendLinkStatusNotification(true); 63319380daaf46815c80bd89fd9ca3af3c4095952b5Irfan Sheriff } 63407573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff break; 635b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 636b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng case EVENT_BSSID_CHANGE: 637b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng transitionTo(mVerifyingLinkState); 63807573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff break; 639b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 640b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng case CMD_RSSI_FETCH: 641b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (msg.arg1 == mRssiFetchToken) { 642f6307820c88e694e102824225b9d8caa6de75a30Yuhao Zheng mWsmChannel.sendMessage(WifiManager.RSSI_PKTCNT_FETCH); 643b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng sendMessageDelayed(obtainMessage(CMD_RSSI_FETCH, ++mRssiFetchToken, 0), 644b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng LINK_SAMPLING_INTERVAL_MS); 645b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 646b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng break; 647b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 648f6307820c88e694e102824225b9d8caa6de75a30Yuhao Zheng case WifiManager.RSSI_PKTCNT_FETCH_SUCCEEDED: 649f6307820c88e694e102824225b9d8caa6de75a30Yuhao Zheng RssiPacketCountInfo info = (RssiPacketCountInfo) msg.obj; 650f6307820c88e694e102824225b9d8caa6de75a30Yuhao Zheng int rssi = info.rssi; 651b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd("Fetch RSSI succeed, rssi=" + rssi); 652b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 653b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng long time = mCurrentBssid.mBssidAvoidTimeMax - SystemClock.elapsedRealtime(); 654b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (time <= 0) { 655b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // max avoidance time is met 656b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd("Max avoid time elapsed"); 657b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng sendLinkStatusNotification(true); 658b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } else { 659b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (rssi >= mCurrentBssid.mGoodLinkTargetRssi) { 660b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (++mSampleCount >= mCurrentBssid.mGoodLinkTargetCount) { 661b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // link is good again 662b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd("Good link detected, rssi=" + rssi); 663b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mCurrentBssid.mBssidAvoidTimeMax = 0; 664b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng sendLinkStatusNotification(true); 665b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 66607573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff } else { 667b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mSampleCount = 0; 668b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd("Link is still poor, time left=" + time); 66907573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff } 67007573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff } 67107573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff break; 672b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 673f6307820c88e694e102824225b9d8caa6de75a30Yuhao Zheng case WifiManager.RSSI_PKTCNT_FETCH_FAILED: 674b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd("RSSI_FETCH_FAILED"); 675b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng break; 676b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 67707573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff default: 67807573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff return NOT_HANDLED; 679654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 68007573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff return HANDLED; 681654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 682654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 683654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 684b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 685b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * WiFi is connected and link is verified. 686b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 68707573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff class ConnectedState extends State { 688654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy @Override 689654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy public void enter() { 690b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd(getName()); 691654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 692b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 693654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy @Override 694654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy public boolean processMessage(Message msg) { 69507573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff switch (msg.what) { 69607573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff case EVENT_WATCHDOG_SETTINGS_CHANGE: 69707573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff updateSettings(); 698b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // STOPSHIP: Remove this at ship 699b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng logd("Updated secure settings and turned debug on"); 70007573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff DBG = true; 701654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 70207573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff if (mPoorNetworkDetectionEnabled) { 70307573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff transitionTo(mOnlineWatchState); 70407573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff } else { 70507573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff transitionTo(mOnlineState); 70607573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff } 707654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy return HANDLED; 708654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 70907573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff return NOT_HANDLED; 710654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 711654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 712654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 713b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 714b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * RSSI is high enough and don't need link monitoring. 715b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 716654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy class OnlineWatchState extends State { 717b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng @Override 718654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy public void enter() { 719b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd(getName()); 72007573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff if (mPoorNetworkDetectionEnabled) { 721b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // treat entry as an rssi change 72207573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff handleRssiChange(); 72307573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff } else { 72407573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff transitionTo(mOnlineState); 72507573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff } 72607573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff } 72707573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff 72807573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff private void handleRssiChange() { 729edba852930bd2e9ab41f74f340595dafe500c756Irfan Sheriff if (mCurrentSignalLevel <= LINK_MONITOR_LEVEL_THRESHOLD && mCurrentBssid != null) { 730b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng transitionTo(mLinkMonitoringState); 7314c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff } else { 732b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // stay here 73307573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff } 734654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 735654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 736654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy @Override 737654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy public boolean processMessage(Message msg) { 738654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy switch (msg.what) { 739654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy case EVENT_RSSI_CHANGE: 7404c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff mCurrentSignalLevel = calculateSignalLevel(msg.arg1); 741b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng handleRssiChange(); 7424c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff break; 7434c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff default: 7444c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff return NOT_HANDLED; 7454c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff } 7464c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff return HANDLED; 7474c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff } 7484c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff } 74907573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff 750b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 751b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Keep sampling the link and monitor any poor link situation. 752b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 753b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng class LinkMonitoringState extends State { 754b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 755b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private int mSampleCount; 756b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 757b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private int mLastRssi; 758b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private int mLastTxGood; 759b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private int mLastTxBad; 760b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 761b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng @Override 7624c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff public void enter() { 763b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd(getName()); 764b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mSampleCount = 0; 765b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mCurrentLoss = new VolumeWeightedEMA(EXP_COEFFICIENT_MONITOR); 7664c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff sendMessage(obtainMessage(CMD_RSSI_FETCH, ++mRssiFetchToken, 0)); 7674c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff } 76807573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff 769b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng @Override 7704c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff public boolean processMessage(Message msg) { 7714c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff switch (msg.what) { 7724c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff case EVENT_RSSI_CHANGE: 7734c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff mCurrentSignalLevel = calculateSignalLevel(msg.arg1); 774b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (mCurrentSignalLevel <= LINK_MONITOR_LEVEL_THRESHOLD) { 775b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // stay here; 7764c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff } else { 777b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // we don't need frequent RSSI monitoring any more 7784c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff transitionTo(mOnlineWatchState); 7794c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff } 78007573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff break; 781b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 782b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng case EVENT_BSSID_CHANGE: 783b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng transitionTo(mLinkMonitoringState); 784b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng break; 785b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 7864c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff case CMD_RSSI_FETCH: 787b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (!mIsScreenOn) { 788b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng transitionTo(mOnlineState); 789b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } else if (msg.arg1 == mRssiFetchToken) { 790f6307820c88e694e102824225b9d8caa6de75a30Yuhao Zheng mWsmChannel.sendMessage(WifiManager.RSSI_PKTCNT_FETCH); 7914c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff sendMessageDelayed(obtainMessage(CMD_RSSI_FETCH, ++mRssiFetchToken, 0), 792b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng LINK_SAMPLING_INTERVAL_MS); 7934c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff } 7944c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff break; 795654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 796f6307820c88e694e102824225b9d8caa6de75a30Yuhao Zheng case WifiManager.RSSI_PKTCNT_FETCH_SUCCEEDED: 797f6307820c88e694e102824225b9d8caa6de75a30Yuhao Zheng RssiPacketCountInfo info = (RssiPacketCountInfo) msg.obj; 798f6307820c88e694e102824225b9d8caa6de75a30Yuhao Zheng int rssi = info.rssi; 799b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng int mrssi = (mLastRssi + rssi) / 2; 800f6307820c88e694e102824225b9d8caa6de75a30Yuhao Zheng int txbad = info.txbad; 801f6307820c88e694e102824225b9d8caa6de75a30Yuhao Zheng int txgood = info.txgood; 802b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd("Fetch RSSI succeed, rssi=" + rssi + " mrssi=" + mrssi + " txbad=" 803b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng + txbad + " txgood=" + txgood); 804b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 805b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // skip the first data point as we want incremental values 806b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng long now = SystemClock.elapsedRealtime(); 807b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (now - mCurrentBssid.mLastTimeSample < LINK_SAMPLING_INTERVAL_MS * 2) { 808b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 809b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // update packet loss statistics 810b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng int dbad = txbad - mLastTxBad; 811b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng int dgood = txgood - mLastTxGood; 812b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng int dtotal = dbad + dgood; 813b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 814b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (dtotal > 0) { 815b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // calculate packet loss in the last sampling interval 816b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng double loss = ((double) dbad) / ((double) dtotal); 817b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 818b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mCurrentLoss.update(loss, dtotal); 819b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 820b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) { 821b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng DecimalFormat df = new DecimalFormat("#.##"); 822b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng logd("Incremental loss=" + dbad + "/" + dtotal + " Current loss=" 823b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng + df.format(mCurrentLoss.mValue * 100) + "% volume=" 824b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng + df.format(mCurrentLoss.mVolume)); 825b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 826b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 827b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mCurrentBssid.updateLoss(mrssi, loss, dtotal); 828b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 829b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // check for high packet loss and send poor link notification 830b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (mCurrentLoss.mValue > POOR_LINK_LOSS_THRESHOLD 831b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng && mCurrentLoss.mVolume > POOR_LINK_MIN_VOLUME) { 832b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (++mSampleCount >= POOR_LINK_SAMPLE_COUNT) 833b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (mCurrentBssid.poorLinkDetected(rssi)) { 834b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng sendLinkStatusNotification(false); 835b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng ++mRssiFetchToken; 836b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 837b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } else { 838b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mSampleCount = 0; 839b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 840b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 841654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 842b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 843b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mCurrentBssid.mLastTimeSample = now; 844b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mLastTxBad = txbad; 845b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mLastTxGood = txgood; 846b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mLastRssi = rssi; 84707573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff break; 848b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 849f6307820c88e694e102824225b9d8caa6de75a30Yuhao Zheng case WifiManager.RSSI_PKTCNT_FETCH_FAILED: 850b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // can happen if we are waiting to get a disconnect notification 851b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd("RSSI_FETCH_FAILED"); 8524c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff break; 853b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 85407573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff default: 85507573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff return NOT_HANDLED; 856654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 85707573b32494acbabd21979d8b9584c1ed3f7a6adIrfan Sheriff return HANDLED; 858654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy } 8594c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff } 860654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy 861b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 862b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Child state of ConnectedState indicating that we are online and there is nothing to do. 86319380daaf46815c80bd89fd9ca3af3c4095952b5Irfan Sheriff */ 86419380daaf46815c80bd89fd9ca3af3c4095952b5Irfan Sheriff class OnlineState extends State { 8654c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff @Override 8664c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff public void enter() { 867b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd(getName()); 868b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 869b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 870b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng @Override 871b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng public boolean processMessage(Message msg) { 872b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng switch (msg.what) { 873b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng case EVENT_SCREEN_ON: 874b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mIsScreenOn = true; 875b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (mPoorNetworkDetectionEnabled) 876b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng transitionTo(mOnlineWatchState); 877b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng break; 878b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng default: 879b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng return NOT_HANDLED; 880b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 881b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng return HANDLED; 8824c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff } 88319380daaf46815c80bd89fd9ca3af3c4095952b5Irfan Sheriff } 88419380daaf46815c80bd89fd9ca3af3c4095952b5Irfan Sheriff 885b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private void updateCurrentBssid(String bssid) { 886b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd("Update current BSSID to " + (bssid != null ? bssid : "null")); 887b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 888b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // if currently not connected, then set current BSSID to null 889b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (bssid == null) { 890b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (mCurrentBssid == null) return; 891b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mCurrentBssid = null; 892b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd("BSSID changed"); 893b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng sendMessage(EVENT_BSSID_CHANGE); 894b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng return; 895b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 896b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 897b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // if it is already the current BSSID, then done 898b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (mCurrentBssid != null && bssid.equals(mCurrentBssid.mBssid)) return; 899b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 900b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // search for the new BSSID in the cache, add to cache if not found 901b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mCurrentBssid = mBssidCache.get(bssid); 902b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (mCurrentBssid == null) { 903b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mCurrentBssid = new BssidStatistics(bssid); 904b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mBssidCache.put(bssid, mCurrentBssid); 905b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 906b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 907b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // send BSSID change notification 908b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd("BSSID changed"); 909b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng sendMessage(EVENT_BSSID_CHANGE); 910b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 911b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 9124c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff private int calculateSignalLevel(int rssi) { 913b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng int signalLevel = WifiManager.calculateSignalLevel(rssi, WifiManager.RSSI_LEVELS); 914b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) 915b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng logd("RSSI current: " + mCurrentSignalLevel + " new: " + rssi + ", " + signalLevel); 9164c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff return signalLevel; 9174c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff } 9184c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff 919b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private void sendLinkStatusNotification(boolean isGood) { 920b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd("########################################"); 921b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (isGood) { 922b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mWsmChannel.sendMessage(GOOD_LINK_DETECTED); 923edba852930bd2e9ab41f74f340595dafe500c756Irfan Sheriff if (mCurrentBssid != null) { 924edba852930bd2e9ab41f74f340595dafe500c756Irfan Sheriff mCurrentBssid.mLastTimeGood = SystemClock.elapsedRealtime(); 925edba852930bd2e9ab41f74f340595dafe500c756Irfan Sheriff } 926edba852930bd2e9ab41f74f340595dafe500c756Irfan Sheriff if (DBG) logd("Good link notification is sent"); 92790d57dfac3113247e2d38a2235254fc35d12856aIrfan Sheriff } else { 928b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mWsmChannel.sendMessage(POOR_LINK_DETECTED); 929edba852930bd2e9ab41f74f340595dafe500c756Irfan Sheriff if (mCurrentBssid != null) { 930edba852930bd2e9ab41f74f340595dafe500c756Irfan Sheriff mCurrentBssid.mLastTimePoor = SystemClock.elapsedRealtime(); 931edba852930bd2e9ab41f74f340595dafe500c756Irfan Sheriff } 932b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng logd("Poor link notification is sent"); 93390d57dfac3113247e2d38a2235254fc35d12856aIrfan Sheriff } 9344c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff } 9354c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff 936d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy /** 937b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Convenience function for retrieving a single secure settings value as a 938b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * boolean. Note that internally setting values are always stored as 939b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * strings; this function converts the string to a boolean for you. The 940b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * default value will be returned if the setting is not defined or not a 941b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * valid boolean. 942d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy * 943d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy * @param cr The ContentResolver to access. 944d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy * @param name The name of the setting to retrieve. 945d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy * @param def Value to return if the setting is not defined. 946b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * @return The setting's current value, or 'def' if it is not defined or not 947b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * a valid boolean. 948d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy */ 949bdfce2ec05a3e9ca6acd6711de6133e06f2446e6Jeff Sharkey private static boolean getSettingsGlobalBoolean(ContentResolver cr, String name, boolean def) { 950bdfce2ec05a3e9ca6acd6711de6133e06f2446e6Jeff Sharkey return Settings.Global.getInt(cr, name, def ? 1 : 0) == 1; 951d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy } 952d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy 953d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy /** 954b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Convenience function for updating a single settings value as an integer. 955b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * This will either create a new entry in the table if the given name does 956b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * not exist, or modify the value of the existing row with that name. Note 957b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * that internally setting values are always stored as strings, so this 958b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * function converts the given value to a string before storing it. 959d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy * 960d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy * @param cr The ContentResolver to access. 961d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy * @param name The name of the setting to modify. 962d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy * @param value The new value for the setting. 963d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy * @return true if the value was set, false on database errors 964d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy */ 965bdfce2ec05a3e9ca6acd6711de6133e06f2446e6Jeff Sharkey private static boolean putSettingsGlobalBoolean(ContentResolver cr, String name, boolean value) { 966bdfce2ec05a3e9ca6acd6711de6133e06f2446e6Jeff Sharkey return Settings.Global.putInt(cr, name, value ? 1 : 0); 967d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy } 968d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy 969b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static void logd(String s) { 9707f8a12c75cf2b376fce58fc22b5ecb1b64acf110Irfan Sheriff Log.d(TAG, s); 9717f8a12c75cf2b376fce58fc22b5ecb1b64acf110Irfan Sheriff } 972d7b3e6a39b6b2e155b24ef470023bafb3b9fa35aIsaac Levy 9734c8982ad820007512e4e9cbb7f15925228d70761Irfan Sheriff private static void loge(String s) { 9747f8a12c75cf2b376fce58fc22b5ecb1b64acf110Irfan Sheriff Log.e(TAG, s); 9757f8a12c75cf2b376fce58fc22b5ecb1b64acf110Irfan Sheriff } 976b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 977b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 978b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Bundle of good link count parameters 979b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 980b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static class GoodLinkTarget { 981b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng public final int RSSI_ADJ_DBM; 982b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng public final int SAMPLE_COUNT; 983b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng public final int REDUCE_TIME_MS; 984b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng public GoodLinkTarget(int adj, int count, int time) { 985b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng RSSI_ADJ_DBM = adj; 986b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng SAMPLE_COUNT = count; 987b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng REDUCE_TIME_MS = time; 988b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 989b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 990b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 991b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 992b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Bundle of max avoidance time parameters 993b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 994b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private static class MaxAvoidTime { 995b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng public final int TIME_MS; 996b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng public final int MIN_RSSI_DBM; 997b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng public MaxAvoidTime(int time, int rssi) { 998b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng TIME_MS = time; 999b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng MIN_RSSI_DBM = rssi; 1000b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 1001b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 1002b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1003b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 1004b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Volume-weighted Exponential Moving Average (V-EMA) 1005b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * - volume-weighted: each update has its own weight (number of packets) 1006b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * - exponential: O(1) time and O(1) space for both update and query 1007b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * - moving average: reflect most recent results and expire old ones 1008b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 1009b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private class VolumeWeightedEMA { 1010b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private double mValue; 1011b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private double mVolume; 1012b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private double mProduct; 1013b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private final double mAlpha; 1014b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1015b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng public VolumeWeightedEMA(double coefficient) { 1016b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mValue = 0.0; 1017b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mVolume = 0.0; 1018b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mProduct = 0.0; 1019b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mAlpha = coefficient; 1020b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 1021b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1022b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng public void update(double newValue, int newVolume) { 1023b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (newVolume <= 0) return; 1024b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // core update formulas 1025b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng double newProduct = newValue * newVolume; 1026b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mProduct = mAlpha * newProduct + (1 - mAlpha) * mProduct; 1027b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mVolume = mAlpha * newVolume + (1 - mAlpha) * mVolume; 1028b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mValue = mProduct / mVolume; 1029b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 1030b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 1031b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1032b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 1033b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Record (RSSI -> pakce loss %) mappings of one BSSID 1034b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 1035b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private class BssidStatistics { 1036b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1037b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /* MAC address of this BSSID */ 1038b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private final String mBssid; 1039b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1040b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /* RSSI -> packet loss % mappings */ 1041b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private VolumeWeightedEMA[] mEntries; 1042b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private int mRssiBase; 1043b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private int mEntriesSize; 1044b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1045b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /* Target to send good link notification, set when poor link is detected */ 1046b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private int mGoodLinkTargetRssi; 1047b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private int mGoodLinkTargetCount; 1048b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1049b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /* Index of GOOD_LINK_TARGET array */ 1050b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private int mGoodLinkTargetIndex; 1051b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1052b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /* Timestamps of some last events */ 1053b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private long mLastTimeSample; 1054b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private long mLastTimeGood; 1055b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private long mLastTimePoor; 1056b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1057b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /* Max time to avoid this BSSID */ 1058b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng private long mBssidAvoidTimeMax; 1059b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1060b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 1061b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Constructor 1062b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * 1063b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * @param bssid is the address of this BSSID 1064b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 1065b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng public BssidStatistics(String bssid) { 1066b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng this.mBssid = bssid; 1067b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mRssiBase = BSSID_STAT_RANGE_LOW_DBM; 1068b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mEntriesSize = BSSID_STAT_RANGE_HIGH_DBM - BSSID_STAT_RANGE_LOW_DBM + 1; 1069b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mEntries = new VolumeWeightedEMA[mEntriesSize]; 1070b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng for (int i = 0; i < mEntriesSize; i++) 1071b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mEntries[i] = new VolumeWeightedEMA(EXP_COEFFICIENT_RECORD); 1072b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 1073b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1074b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 1075b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Update this BSSID cache 1076b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * 1077b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * @param rssi is the RSSI 1078b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * @param value is the new instant loss value at this RSSI 1079b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * @param volume is the volume for this single update 1080b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 1081b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng public void updateLoss(int rssi, double value, int volume) { 1082b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (volume <= 0) return; 1083b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng int index = rssi - mRssiBase; 1084b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (index < 0 || index >= mEntriesSize) return; 1085b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mEntries[index].update(value, volume); 1086b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) { 1087b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng DecimalFormat df = new DecimalFormat("#.##"); 1088b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng logd("Cache updated: loss[" + rssi + "]=" + df.format(mEntries[index].mValue * 100) 1089b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng + "% volume=" + df.format(mEntries[index].mVolume)); 1090b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 1091b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 1092b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1093b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 1094b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Get preset loss if the cache has insufficient data, observed from experiments. 1095b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * 1096b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * @param rssi is the input RSSI 1097b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * @return preset loss of the given RSSI 1098b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 1099b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng public double presetLoss(int rssi) { 1100b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (rssi <= -90) return 1.0; 1101b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (rssi > 0) return 0.0; 1102b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1103b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (sPresetLoss == null) { 1104b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // pre-calculate all preset losses only once, then reuse them 1105b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng final int size = 90; 1106b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng sPresetLoss = new double[size]; 1107b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng for (int i = 0; i < size; i++) sPresetLoss[i] = 1.0 / Math.pow(90 - i, 1.5); 1108b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 1109b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng return sPresetLoss[-rssi]; 1110b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 1111b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1112b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 1113b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * A poor link is detected, calculate a target RSSI to bring WiFi back. 1114b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * 1115b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * @param rssi is the current RSSI 1116b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * @return true iff the current BSSID should be avoided 1117b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 1118b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng public boolean poorLinkDetected(int rssi) { 1119b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd("Poor link detected, rssi=" + rssi); 1120b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1121b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng long now = SystemClock.elapsedRealtime(); 1122b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng long lastGood = now - mLastTimeGood; 1123b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng long lastPoor = now - mLastTimePoor; 1124b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1125b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // reduce the difficulty of good link target if last avoidance was long time ago 1126b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng while (mGoodLinkTargetIndex > 0 1127b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng && lastPoor >= GOOD_LINK_TARGET[mGoodLinkTargetIndex - 1].REDUCE_TIME_MS) 1128b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mGoodLinkTargetIndex--; 1129b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mGoodLinkTargetCount = GOOD_LINK_TARGET[mGoodLinkTargetIndex].SAMPLE_COUNT; 1130b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1131b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // scan for a target RSSI at which the link is good 1132b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng int from = rssi + GOOD_LINK_RSSI_RANGE_MIN; 1133b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng int to = rssi + GOOD_LINK_RSSI_RANGE_MAX; 1134b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mGoodLinkTargetRssi = findRssiTarget(from, to, GOOD_LINK_LOSS_THRESHOLD); 1135b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mGoodLinkTargetRssi += GOOD_LINK_TARGET[mGoodLinkTargetIndex].RSSI_ADJ_DBM; 1136b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (mGoodLinkTargetIndex < GOOD_LINK_TARGET.length - 1) mGoodLinkTargetIndex++; 1137b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1138b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // calculate max avoidance time to prevent avoiding forever 1139b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng int p = 0, pmax = MAX_AVOID_TIME.length - 1; 1140b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng while (p < pmax && rssi >= MAX_AVOID_TIME[p + 1].MIN_RSSI_DBM) p++; 1141b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng long avoidMax = MAX_AVOID_TIME[p].TIME_MS; 1142b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1143b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // don't avoid if max avoidance time is 0 (RSSI is super high) 1144b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (avoidMax <= 0) return false; 1145b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1146b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // set max avoidance time, send poor link notification 1147b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mBssidAvoidTimeMax = now + avoidMax; 1148b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1149b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd("goodRssi=" + mGoodLinkTargetRssi + " goodCount=" + mGoodLinkTargetCount 1150b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng + " lastGood=" + lastGood + " lastPoor=" + lastPoor + " avoidMax=" + avoidMax); 1151b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1152b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng return true; 1153b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 1154b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1155b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 1156b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * A new BSSID is connected, recalculate target RSSI threshold 1157b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 1158b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng public void newLinkDetected() { 1159b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // if this BSSID is currently being avoided, the reuse those values 1160b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (mBssidAvoidTimeMax > 0) { 1161b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd("Previous avoidance still in effect, rssi=" + mGoodLinkTargetRssi 1162b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng + " count=" + mGoodLinkTargetCount); 1163b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng return; 1164b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 1165b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1166b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // calculate a new RSSI threshold for new link verifying 1167b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng int from = BSSID_STAT_RANGE_LOW_DBM; 1168b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng int to = BSSID_STAT_RANGE_HIGH_DBM; 1169b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mGoodLinkTargetRssi = findRssiTarget(from, to, GOOD_LINK_LOSS_THRESHOLD); 1170b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mGoodLinkTargetCount = 1; 1171b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng mBssidAvoidTimeMax = SystemClock.elapsedRealtime() + MAX_AVOID_TIME[0].TIME_MS; 1172b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) logd("New link verifying target set, rssi=" + mGoodLinkTargetRssi + " count=" 1173b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng + mGoodLinkTargetCount); 1174b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 1175b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1176b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng /** 1177b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * Return the first RSSI within the range where loss[rssi] < threshold 1178b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * 1179b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * @param from start scanning from this RSSI 1180b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * @param to stop scanning at this RSSI 1181b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * @param threshold target threshold for scanning 1182b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng * @return target RSSI 1183b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng */ 1184b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng public int findRssiTarget(int from, int to, double threshold) { 1185b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng from -= mRssiBase; 1186b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng to -= mRssiBase; 1187b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng int emptyCount = 0; 1188b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng int d = from < to ? 1 : -1; 1189b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng for (int i = from; i != to; i += d) 1190b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // don't use a data point if it volume is too small (statistically unreliable) 1191b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (i >= 0 && i < mEntriesSize && mEntries[i].mVolume > 1.0) { 1192b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng emptyCount = 0; 1193b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (mEntries[i].mValue < threshold) { 1194b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // scan target found 1195b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng int rssi = mRssiBase + i; 1196b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) { 1197b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng DecimalFormat df = new DecimalFormat("#.##"); 1198b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng logd("Scan target found: rssi=" + rssi + " threshold=" 1199b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng + df.format(threshold * 100) + "% value=" 1200b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng + df.format(mEntries[i].mValue * 100) + "% volume=" 1201b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng + df.format(mEntries[i].mVolume)); 1202b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 1203b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng return rssi; 1204b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 1205b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } else if (++emptyCount >= BSSID_STAT_EMPTY_COUNT) { 1206b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng // cache has insufficient data around this RSSI, use preset loss instead 1207b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng int rssi = mRssiBase + i; 1208b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng double lossPreset = presetLoss(rssi); 1209b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (lossPreset < threshold) { 1210b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng if (DBG) { 1211b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng DecimalFormat df = new DecimalFormat("#.##"); 1212b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng logd("Scan target found: rssi=" + rssi + " threshold=" 1213b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng + df.format(threshold * 100) + "% value=" 1214b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng + df.format(lossPreset * 100) + "% volume=preset"); 1215b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 1216b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng return rssi; 1217b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 1218b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 1219b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng 1220b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng return mRssiBase + to; 1221b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 1222b33227d23eb0ec3507192f94c2eee651a0f97783Yuhao Zheng } 1223654f5090754e4e1bf4c1736d0a24769a15a6037eIsaac Levy} 1224