iOS/iPhone BLE service discovery timeout with ant shared channel demo

RE: iOS/iPhone BLE service discovery timeout with ant shared channel demo

philip — Fri, 10 Feb 2017 12:37:10 GMT

Super yes, that indeed does the trick - many thanks! I was following the wrong idea.. Just complete: ble_evt_dispatch(..) is to be found in asc_coordinator.c. According to philips77 the new iOS (10.xx) is sending the ATT MTU request which previous versions didn't.

RE: iOS/iPhone BLE service discovery timeout with ant shared channel demo

Petter Myhre — Thu, 09 Feb 2017 10:25:53 GMT

I did a sniffer trace, it seems iOS is sending a ATT MTU request that is not responded to, and because of that iOS disconnects after 30s.

If you replace the ble_evt_dispatch() function with the following, the MTU request should be responded to:

static void ble_evt_dispatch(ble_evt_t * p_ble_evt)
{
    uint32_t err_code;
    
    cntrldevice_event_handler(p_ble_evt);    
    
    if(p_ble_evt->header.evt_id == BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST)
    {
        err_code = sd_ble_gatts_exchange_mtu_reply(p_ble_evt->evt.common_evt.conn_handle, GATT_MTU_SIZE_DEFAULT); 
        APP_ERROR_CHECK(err_code);
    }
}

I would also like to mention that the iOS app is old (2 years), it is not tested with later SDK, and it will not be updated. It can of course still be used as a starting point for development.

RE: iOS/iPhone BLE service discovery timeout with ant shared channel demo

philip — Wed, 08 Feb 2017 14:17:31 GMT

Ah very good idea, right on it now - many thanks!

RE: iOS/iPhone BLE service discovery timeout with ant shared channel demo

Petter Myhre — Tue, 07 Feb 2017 16:23:39 GMT

I'm not sure what could be causing this. Have you done a sniffer trace to see what is happening on air? You can use the nRF Sniffer. I'll try to test this first thing tomorrow.