About Connect Supervision timeout

[happy]

I use the SDK9.0，When a bluetooth device and android APP to connect, disconnect the bluetooth device power, why wait for 20 seconds, the APP to detect device has been disconnected.Why do I change my SDK9.0 connection timeout short, still doesn't work, or 20 seconds APP to receive notice to disconnect.For example,#define CONN_SUP_TIMEOUT MSEC_TO_UNITS(4000, UNIT_10_MS) change into #define CONN_SUP_TIMEOUT MSEC_TO_UNITS(500, UNIT_10_MS) But the APP is still in the bluetooth device power off after 5 seconds didn't receive the gatt disconnect at the bottom of the notice.

[Yuri Ya]

In fact the reason is in SDK. If you are going to use SDK9.0 you need to modify is_conn_params_ok() function. This is because it doesn't check Latency and Timeout which are offered by Android. Look at this function in SDK14 to have an idea how to modify it to force Android to accept parameters you need.