Re: [android-developers] How to keep WiFi on and let screen go to sleep?

Acquiring wifilock like this only makes sure the system does not shut down wifi. The actual wifi connection still goes through power optimizations once screen is off in the driver. 

This should not drop your connections,

But it does.   As I said, it sends a "FIN" packet - that's a request to close the connection.   The server responds with an ACK and.a FIN of its own which Android ACKs.   This is the textbook-standard way to close a TCP connection, and it's initiated by Android when the display goes off.     We watch it all on our network sniffers and it's 100% reliable and repeatable.

The Android device does not send a FIN packet as long as the display stays on, no matter how long it stays on.

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