ble_nus_string_send error

[Nhiphuc]

Hi, I am merging the Thingy app (Segger with softdevice s132_nrf52_4.0.5) with the UART example (taken from ble_app_uart in SDK 11). I have been fixing some errors before getting this error with ble_nus_string_send(&m_nus,data,length). I tracked in the debug and saw that p_nus->conn_handle = 0xFFFF and p_nusp_nus->is_notification_enabled= false.

This is the main loop:

        app_sched_execute();       
       
        err_code=ble_nus_string_send(&m_nus,data,length); /*data is random created by me*/
 
        if ((err_code != NRF_SUCCESS) && (err_code != NRF_ERROR_BUSY))
          {
              NRF_LOG_ERROR("Failed receiving NUS message. Error 0x%x.\n ", err_code);                   
          }
       
       
        if (!NRF_LOG_PROCESS()) // Process logs
        {
            power_manage();
        }

Everything works fine except that i cannot send data using ble_nus_string_send. (also if i run the ble_app_uart example alone, it works just fine).

Please give me some clues to fix this error. Many thanks.

[awneil]

Nhiphuc said:

p_nus->conn_handle = 0xFFFF

I think that means you are not connected (or have lost the connection).

How to properly post source code:

[Nhiphuc]

static void thingy_init(void)
{
    uint32_t                 err_code;
    m_ui_init_t              ui_params;
    m_environment_init_t     env_params;
    m_motion_init_t          motion_params;
    m_ble_init_t             ble_params;
    batt_meas_init_t         batt_meas_init = BATT_MEAS_PARAM_CFG;

    ble_nus_init_t nus_init;
    memset(&nus_init, 0, sizeof(nus_init));

    nus_init.data_handler = nus_data_handler;
    
    

    /**@brief Initialize the TWI manager. */
    err_code = twi_manager_init(APP_IRQ_PRIORITY_THREAD);
    APP_ERROR_CHECK(err_code);

    /**@brief Initialize LED and button UI module. */
    ui_params.p_twi_instance = &m_twi_sensors;
    err_code = m_ui_init(&m_ble_service_handles[THINGY_SERVICE_UI],
                         &ui_params);
    APP_ERROR_CHECK(err_code);

    /**@brief Initialize environment module. */
    env_params.p_twi_instance = &m_twi_sensors;
    err_code = m_environment_init(&m_ble_service_handles[THINGY_SERVICE_ENVIRONMENT],
                                  &env_params);
    APP_ERROR_CHECK(err_code);

    /**@brief Initialize motion module. */
    motion_params.p_twi_instance = &m_twi_sensors;

    err_code = m_motion_init(&m_ble_service_handles[THINGY_SERVICE_MOTION],
                             &motion_params);
    APP_ERROR_CHECK(err_code);

    err_code = m_sound_init(&m_ble_service_handles[THINGY_SERVICE_SOUND]);
    APP_ERROR_CHECK(err_code);

    /**@brief Initialize the battery measurement. */
    batt_meas_init.evt_handler = m_batt_meas_handler;
    err_code = m_batt_meas_init(&m_ble_service_handles[THINGY_SERVICE_BATTERY], &batt_meas_init);
    APP_ERROR_CHECK(err_code);    

    err_code = m_batt_meas_enable(BATT_MEAS_INTERVAL_MS);
    APP_ERROR_CHECK(err_code);

    /**@brief Initialize BLE handling module. */
    ble_params.evt_handler       = thingy_ble_evt_handler;
    ble_params.p_service_handles = m_ble_service_handles;
    ble_params.service_num       = THINGY_SERVICES_MAX;

    err_code = m_ble_init(&ble_params);
    APP_ERROR_CHECK(err_code);     

    err_code = m_ui_led_set_event(M_UI_BLE_DISCONNECTED);
    APP_ERROR_CHECK(err_code);

    err_code = ble_nus_init(&m_nus, &nus_init);
    APP_ERROR_CHECK(err_code);

}

//And my main function is like this:
// Initialize.
    APP_SCHED_INIT(SCHED_MAX_EVENT_DATA_SIZE, SCHED_QUEUE_SIZE);
   
    err_code = app_timer_init();
    APP_ERROR_CHECK(err_code);
    
    uart_init();
    
    board_init();     
    thingy_init(); 

    for (;;)
    {
    
        app_sched_execute();       
       
        err_code=ble_nus_string_send(&m_nus,data,length);
  
        if ((err_code != NRF_SUCCESS) && (err_code != NRF_ERROR_BUSY))
          {
              NRF_LOG_ERROR("Failed receiving NUS message. Error 0x%x.\n ", err_code);                   
          } 
       
       
        if (!NRF_LOG_PROCESS()) // Process logs
        { 
            power_manage();
        }
    }

Is my initialization failed somewhere and nus service cannot get a good conn_handle?

[awneil]

You said the ble_app_uart example works alone.

So look at what that's doing, compare with what your system is doing ...

[Nhiphuc]

Yes, that is what i did. But the problem is the thingy app and the uart example use different SDKs. Even the uart examples themselves are different between different SDKs. In my problem, i used SDK 11 because it is best suit for the thingy app I am using downloaded from this link: https://devzone.nordicsemi.com/f/nordic-q-a/33599/thingy52-debugging-under-ses.

[awneil]

Eh??

 each SDK includes a UART example!

SDK v11:  infocenter.nordicsemi.com/.../ble_sdk_app_nus_eval.html

[Nhiphuc]

I do use the uart example in SDK v11 to integrate into thingy app.

Can you give me a clue on solving my problem with ble_nus_string_send?

[awneil]

If you're merging with the Thingy code, then you'll need to use the same SDK that the Thingy uses.

[Nhiphuc]

yes, I used the same sdk and it works fine except that i cannot send data with ble_nus_string_send. I have already described the error

[awneil]

and I already suggested how to approach the problem - but you said you couldn't do that because of "different SDKs" !?

I am confused!