RE: After Disconnecting how to advertise after every 1 minute

Kenneth — Thu, 30 Jan 2020 13:58:41 GMT

Hi,

The error code is BLE_ERROR_INVALID_CONN_HANDLE (0x3002). Likely you are not in a connection at the time you try to disconnect.

I would recommend to add a delay between "Send packet -> Disconnect". Either a fixed delay of for instance 100ms, or that you wait for for BLE_GATTS_EVT_HVN_TX_COMPLETE event before you disconnect:
https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s132.api.v7.0.1/group___b_l_e___g_a_t_t_s___h_v_n___m_s_c.html

In general it consumes less power to stay connected if you are transmitting one packet every 1 minute. For instance use a connection interval of 400ms and slave latency of 10 and supervisor timeout of 6 seconds (e.g. 15 empty dummy packets each 1 minute). Then that will draw total average current of 3.8uA while in a connection. I think that is less power than if you need to advertise, establish connection, possible execute MTU exhanges, encryption, send packets and then disconnect every 1minute.

Best regards,
Kenneth