Android5.0系统wifi一直在向wps发送scan问题
logcat -s WifiEnabler Wifimultisupport WifiPowerSetting WifiStateMachine wpa_supplicant ConnectivityService NetworkSettingsActivity WifiController WifiHW CommandListener WifiMonitor WifiSettings WifiConfigStore addOrUpdateNetworkNative dhcpcd WifiManager
一、问题描述
由于网卡本身性能就不好；加之开启p2p功能以后、又是Android框架部分发送scan命令给wps再到驱动，导致网络更加不稳定。
二、问题原因
1.扫描
E/WifiStateMachine( 2023): WifiStateMachine CMD_START_SCAN source -2 txSuccessRate=7.24 rxSuccessRate=50.68 targetRoamBSSID=f4:ec:38:73:02:8e RSSI=-45 E/WifiStateMachine( 2023): TK-------->>>>WifiStateMachine.java>>>>111111111 E/WifiStateMachine( 2023): WifiStateMachine starting scan for "CTS_TEST_FIVE"WPA_PSK with 2412 D/WifiHW ( 2023): TK--------->>>>command is IFNAME=wlan0 SCAN TYPE=ONLY freq=2412,reply is ,reply_len is 4095 D/WifiHW ( 2023): TK-------->>>wifi_send_command,ctrl_conn is � I/wpa_supplicant( 4800): [CTRL_IFACE]wlan0: SCAN TYPE=ONLY freq=2412 I/wpa_supplicant( 4800): wpa_bss_update_scan_res: SSID:X-link No RNS IE !!! I/wpa_supplicant( 4800): D/WifiHW ( 2023): TK--------->>>>command is IFNAME=wlan0 BSS RANGE=0- MASK=0x21987,reply is 6R�,reply_len is 4095 D/WifiHW ( 2023): TK-------->>>wifi_send_command,ctrl_conn is � I/wpa_supplicant( 4800): [CTRL_IFACE]wlan0: BSS RANGE=0- MASK=0x21987 D/WifiHW ( 2023): TK--------->>>>command is IFNAME=wlan0 STATUS-NO_EVENTS,reply is ���,reply_len is 4095 D/WifiHW ( 2023): TK-------->>>wifi_send_command,ctrl_conn is � I/wpa_supplicant( 4800): [CTRL_IFACE]wlan0: STATUS-NO_EVENTS D/WifiHW ( 2023): TK--------->>>>command is IFNAME=wlan0 SIGNAL_POLL,reply is 04031 D/WifiHW ( 2023): flags=[WPA-PSK-CCMP+TKIP][WPA2-PSK-CCMP+TKIP][WPS][ESS] D/WifiHW ( 2023): ssid=CTS_TEST_FIVE D/WifiHW ( 2023): ==== D/WifiHW ( 2023): id=37 D/WifiHW ( 2023): bssid=6c:b0:ce:17:63:6a2.不扫描
E/WifiStateMachine( 2023): WifiStateMachine CMD_START_SCAN source -2 txSuccessRate=59.00 rxSuccessRate=34.75 targetRoamBSSID=f4:ec:38:73:02:8 e RSSI=-45 E/WifiStateMachine( 2023): TK-------->>>>WifiStateMachine.java>>>>111111111 E/WifiStateMachine( 2023): TK-------->>>>WifiStateMachine.java>>>>22222222222222 E/WifiStateMachine( 2023): TK-------->>>>WifiStateMachine.java>>>>mWifiConfigStore.alwaysEnableScansWhileAssociated is 0 D/WifiHW ( 2023): TK--------->>>>command is IFNAME=p2p0 P2P_LISTEN 5,reply is OK,reply_len is 4095 D/WifiHW ( 2023): TK-------->>>wifi_send_command,ctrl_conn is � I/wpa_supplicant( 4800): [CTRL_IFACE]p2p0: P2P_LISTEN 5 D/WifiHW ( 2023): TK--------->>>>command is IFNAME=wlan0 SIGNAL_POLL,reply is @��,reply_len is 4095 D/WifiHW ( 2023): TK-------->>>wifi_send_command,ctrl_conn is � I/wpa_supplicant( 4800): [CTRL_IFACE]wlan0: SIGNAL_POLL D/WifiHW ( 2023): TK--------->>>>command is IFNAME=wlan0 SIGNAL_POLL,reply is @��,reply_len is 4095 D/WifiHW ( 2023): TK-------->>>wifi_send_command,ctrl_conn is � I/wpa_supplicant( 4800): [CTRL_IFACE]wlan0: SIGNAL_POLL E/WifiStat eMachine( 2023): WifiStateMachine CMD_START_SCAN source -2 txSuccessRate=121.00 rxSuccessRate=119.19 targetRoamBSSID=f4:ec:38:73:02:8e RSSI=- 45 E/WifiStateMachine( 2023): TK-------->>>>WifiStateMachine.java>>>>111111111 E/WifiStateMachine( 2023): TK-------->>>>WifiStateMachine.java>>>>22222222222222 E/WifiStateMachine( 2023): TK-------->>>>WifiStateMachine.java>>>>mWifiConfigStore.alwaysEnableScansWhileAssociated is 0问题就出在如下：
frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiStateMachine.java
if (message.arg1 == SCAN_ALARM_SOURCE || message.arg1 == 1000) { //modify by tank
if (mWifiInfo.txSuccessRate >
mWifiConfigStore.maxTxPacketForPartialScans
|| mWifiInfo.rxSuccessRate >
mWifiConfigStore.maxRxPacketForPartialScans) {
loge("TK-------->>>>WifiStateMachine.java>>>>22222222222222");//add by [email protected]
// Don't scan if lots of packets are being sent
restrictChannelList = true;
loge("TK-------->>>>WifiStateMachine.java>>>>mWifiConfigStore.alwaysEnableScansWhileAssociated is " + mWifiConfigStore.alwaysEnableScansWhileAssociated);//add by [email protected]
if (mWifiConfigStore.alwaysEnableScansWhileAssociated == 0) {
if (DBG) {
loge("WifiStateMachine CMD_START_SCAN source " + message.arg1
+ " ...and ignore scans"
+ " tx=" + String.format("%.2f", mWifiInfo.txSuccessRate)
+ " rx=" + String.format("%.2f", mWifiInfo.rxSuccessRate));
}
messageHandlingStatus = MESSAGE_HANDLING_STATUS_REFUSED;
return HANDLED;
}
}
}
看如上maxTxPacketForPartialScans和maxRxPacketForPartialScans的定义：
frameworks/opt/net/wifi/service/java/com/android/server/wifi/WifiConfigStore.java
public int maxTxPacketForPartialScans = 0;//40; //modify by tank public int maxRxPacketForPartialScans = 0;//80; //modify by tank
三、问题解决
修改如上后问题解决；原因为Android5.0本身就有这个自动scan的机制。