BLE Advertise does not restart after disconnection

[Portilha]

Hello everyone,

I am using the NRF5340-DK development board, but I am having trouble restarting advertising when my smartphone connects or disconnects from the board. Once I connect and pair my smartphone, advertising stops. I am trying to restart it after the BLE disconnect callback, but despite no function returning an error, I cannot see the board advertising on my smartphone. Below is a snippet of my code:

/* Disconnect callback */
void BLEHandler::BluetoothDisconnected(struct bt_conn *conn, uint8_t reason)
{
    ble::BLEHandler& BLE = ble::BLEHandler::Instance();
    char addr[BT_ADDR_LE_STR_LEN];
	bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));

    k_sem_give(&BLE.m_DisconnectedSemaphore);
}

Main loop:

if(k_sem_take(&m_DisconnectedSemaphore, K_NO_WAIT) == 0)
{
    int rc = bleHandler.StopAdvertise();
    if(rc != 0)
        Log("Error stop advertise: %d\n", rc);
    k_msleep(100);
    rc = bleHandler.StartAdvertise(&BLEConfig);
    if(rc != 0)
        Log("Error re-start advertise: %d\n", rc);
    else
        Log("Restarted advertise\n");
}

And my StartAdvertise function:

int BLEHandler::StartAdvertise(const BluetoothConfig_st *config)
{
    int rc = 0;

    if (config->CCC_DK_DeviceName == NULL)
        return -EINVAL;

    rc = bt_set_name(config->CCC_DK_DeviceName);
    if (rc != 0)
        return rc;

    rc = bt_le_adv_start(&config->CCC_DK_AdvParameters, config->CCC_DK_AdvData, config->CCC_DK_AdvDataSize, NULL, 0);

    return rc;
}

Does anyone know if this is the normal behaviour, or how can I fix this?
Best regards.

[Amanda Hsieh]

Hi, 

You can submit start advertising work in the disconnection function like this example. 

Regards,
Amanda H.

[Portilha]

Hello,

I have already tried that, as it was suggest on another thread, however it is not working. The 

bt_le_adv_start function returns 0 once the advertise work gets triggered but on my smartphone I cannot scan the board. Only if I reset the board the advertise restarts again. Do you have any explanation?

Best regards.