How to return BLE peripheral's connection status

RE: How to return BLE peripheral's connection status

Hung Bui — Tue, 27 Jun 2017 08:26:21 GMT

The beacon can request the connection timeout to be updated. But it's the phone who decide which number the timeout should be. You can refer to CONN_SUP_TIMEOUT in the nRF51 firmware. Usually we set it to 4 seconds.

RE: How to return BLE peripheral's connection status

MichaelNordicUser — Mon, 26 Jun 2017 19:23:21 GMT

Sorry, I think I misunderstood you. The master is connected to the peripheral. The peripheral can for example be a beacon, and the master could be a phone running a host Android application. Is the supervision time-out parameter programmed into the beacon or into the phone?

RE: How to return BLE peripheral's connection status

MichaelNordicUser — Mon, 26 Jun 2017 16:18:07 GMT

Why is the connection supervision timeout parameter set by the peripheral if the peripheral is off? Shouldn't the master device be responsible for asking the peripheral if it's disconnected? Or does the peripheral send the parameter to the master?

RE: How to return BLE peripheral's connection status

Hung Bui — Mon, 26 Jun 2017 11:25:01 GMT

Hi Michael,

I would assume that you want to have onConnectionStateChange() involked right away when you power off the device ?

Note that there is one parameter in a connection parameters which is connection supervision timeout. The central will continue to send connection events packet even it doesn't receive anything from the peripheral until the supervision timeout occurs.

This is because if there is an interference occurs for a short period of time the connection still can be restored.

You can reduce the time the central waiting by requesting shorter supervision timeout from the peripheral side.