Android: How to prevent Wi-Fi tearing on DHCP renewal?
We are developing software on a custom Android platform and we are starting to receive complaints from customers about the state of the Wi-Fi connection. It seems that from time to time they lose the Wifi connection for 1-2 seconds and then come back automatically. They can notice this from a little GUI feedback or from the disconnect / reconnect event issued by the XMPP client.
After researching, we found from the log adb logcat
that Wifi changes its state from CONNECTED
to CONNECTING
every time a DHCP update occurs. Since we currently have a DHCP lease of 1 hour, our platform tries to renew its address every 29 minutes. Here is an excerpt from the DHCP update log:
[ 11-24 10:10:11.751 2629: 3350 D/DhcpStateMachine ]
DHCP renewal on wlan0
[ 11-24 10:10:12.351 2629: 3350 D/DhcpStateMachine ]
DHCP succeeded on wlan0
[ 11-24 10:10:12.361 2877: 2877 D/DCT ]
onReceive: action=android.net.wifi.STATE_CHANGE
[ 11-24 10:10:12.361 2877: 2877 D/DCT ]
NETWORK_STATE_CHANGED_ACTION: mIsWifiConnected=false
[ 11-24 10:10:12.361 2877: 2877 D/DCT ]
NETWORK_STATE_CHANGED_ACTION: networkInfo=NetworkInfo: type: WIFI[], state: CONNECTING/VERIFYING_POOR_LINK, reason: (unspecified), extra: "XXX", roaming: false, failover: false, isAvailable: true
[ 11-24 10:10:12.371 2877: 2877 D/DCT ]
onReceive: action=android.net.wifi.STATE_CHANGE
[ 11-24 10:10:12.371 2877: 2877 D/DCT ]
NETWORK_STATE_CHANGED_ACTION: mIsWifiConnected=false
[ 11-24 10:10:12.371 2877: 2877 D/DCT ]
NETWORK_STATE_CHANGED_ACTION: networkInfo=NetworkInfo: type: WIFI[], state: CONNECTING/CAPTIVE_PORTAL_CHECK, reason: (unspecified), extra: "XXX", roaming: false, failover: false, isAvailable: true
[ 11-24 10:10:12.381 2877: 2877 D/DCT ]
onReceive: action=android.net.wifi.STATE_CHANGE
[ 11-24 10:10:12.381 2877: 2877 D/DCT ]
NETWORK_STATE_CHANGED_ACTION: mIsWifiConnected=true
[ 11-24 10:10:12.381 2877: 2877 D/DCT ]
NETWORK_STATE_CHANGED_ACTION: networkInfo=NetworkInfo: type: WIFI[], state: CONNECTED/CONNECTED, reason: (unspecified), extra: "XXX", roaming: false, failover: false, isAvailable: true
How can I prevent the connection state from changing from CONNECTED
to CONNECTING
when using DHCP? Can I change the setting somewhere to change this behavior?
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I don’t think it DISCONNECTING
can really be avoided. The only way to solve this problem is to ignore the state DISCONNECTING
in the Wifi change state and use the isConnectedOrConnecting
from method Network
instead isConnected
to check if we are connected or not.
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