Connection drop immediately in specific Android models

RE: Connection drop immediately in specific Android models

Hung Bui — Tue, 09 Apr 2019 11:23:09 GMT

Ok, so it looks like that the phone tried to change PHY (1Mbps or 2Mbps or Long range) and was waiting for the response from the NRF52 but received nothing, so it disconnected after awhile. It's not "immediately dropped" , the connection remains 40 seconds after the request.

So you would need check if you handle BLE_GAP_EVT_PHY_UPDATE_REQUEST event in your ble_evt_handler() in main.c or not (it's by default handled there in our examples in the SDK) , you would need to call sd_ble_gap_phy_update() to reply to the request, on which PHY you want to use.

RE: Connection drop immediately in specific Android models

Charadhar Rddy — Tue, 09 Apr 2019 06:25:30 GMT

Hi Hung Bui,

I have attached the logs above. Can you please check now to see if it makes things any clearer?

RE: Connection drop immediately in specific Android models

Hung Bui — Mon, 18 Mar 2019 14:28:04 GMT

LMP TIMEOUT is Link Manager Protocol Timeout. This happens when a link layer request didn't get a response after (usually) 30 seconds. It would be much easier to know what exactly causing the issue if you can provide a sniffer trace.