How to print GATT Service (Battery service) value in LOG file.

RE: How to print GATT Service (Battery service) value in LOG file.

AKanade — Thu, 09 Jan 2020 09:07:14 GMT

Thank you for your reply, it is really helpful for me

RE: How to print GATT Service (Battery service) value in LOG file.

Simonr — Wed, 08 Jan 2020 14:14:06 GMT

The function below is the one reading the battery level. If you flash the ble_app_hrs_c application to one board and the peripheral to another. You should then be able to follow the setup and testing instructions here to test it and print the battery level to a UART terminal.

/**@brief Battery level Collector Handler.
 */
static void bas_c_evt_handler(ble_bas_c_t * p_bas_c, ble_bas_c_evt_t * p_bas_c_evt)
{
    ret_code_t err_code;

    switch (p_bas_c_evt->evt_type)
    {
        case BLE_BAS_C_EVT_DISCOVERY_COMPLETE:
        {
            err_code = ble_bas_c_handles_assign(p_bas_c,
                                                p_bas_c_evt->conn_handle,
                                                &p_bas_c_evt->params.bas_db);
            APP_ERROR_CHECK(err_code);

            // Battery service discovered. Enable notification of Battery Level.
            NRF_LOG_DEBUG("Battery Service discovered. Reading battery level.");

            err_code = ble_bas_c_bl_read(p_bas_c);
            APP_ERROR_CHECK(err_code);

            NRF_LOG_DEBUG("Enabling Battery Level Notification.");
            err_code = ble_bas_c_bl_notif_enable(p_bas_c);
            APP_ERROR_CHECK(err_code);

        } break;

        case BLE_BAS_C_EVT_BATT_NOTIFICATION:
            NRF_LOG_INFO("Battery Level received %d %%.", p_bas_c_evt->params.battery_level);
            break;

        case BLE_BAS_C_EVT_BATT_READ_RESP:
            NRF_LOG_INFO("Battery Level Read as %d %%.", p_bas_c_evt->params.battery_level);
            break;

        default:
            break;
    }
}

Best regards,

Simon

RE: How to print GATT Service (Battery service) value in LOG file.

AKanade — Wed, 08 Jan 2020 12:49:06 GMT

please let me know how to add log message into a function for ble_app_hrs_c that can be printed on debug terminal.

RE: How to print GATT Service (Battery service) value in LOG file.

Simonr — Wed, 08 Jan 2020 11:54:26 GMT

I suggest you take a look at the ble_app_hrs example in our SDK, which implements the heart rate and battery measurement service. The central application uses the bas_c_evt_handler function to print and read the battery level.

Best regards,

Simon