Using BLE NUS SERVICE without UART

[arshdeep]

Hello

I would like to send my sensor data to a mobile application using BLE SDK 15. Someone suggested me to go through the BLE NUS SERVICE example which was a good one. I understood a lot of things but now my sensor values are coming on analog pins and not on UART pins. How do i send those values? Would i have to create a whole new service for doing this or could i somehow modify the same example to work according to my needs. Thanks!  

[arshdeep]

Yes, I'm trying to send data through ble_nus_data_send(). First, i just want to understand that how does this API work by sending a demo data after regular intervals. Can you please see in my code that what all i'm doing wrong. I just want to send a test value to nrf connect application. 

static void timeout_handler()
{
     uint32_t       err_code;
    static uint8_t index = 1; //no of bytes 
    static uint8_t data_array = 21; //Test value 
      uint16_t length = (uint16_t)index;
      
    
      err_code =   ble_nus_data_send(&m_nus, &data_array, &length, m_conn_handle);

         if ( (err_code != NRF_ERROR_INVALID_STATE) && (err_code != NRF_ERROR_BUSY) &&
                         (err_code != NRF_ERROR_NOT_FOUND) )
                    {
                        APP_ERROR_CHECK(err_code);
                    }

        NRF_LOG_INFO("Value Received !");
}

  

Thanks,

[Edvin]

Did you enable notifications in the nRF Connect app?

BR,
Edvin

[arshdeep]

Yes, as you can see in the image. I have enabled the notification. I believe there is a bug in my code. Thanks,

[Edvin]

Ok, good.

Can you check the return value of ble_nus_data_send()? Does it return NRF_SUCCESS, or one of the other values that are filtered out, NRF_ERROR_INVALID_STATE or NRF_ERROR_BUSY?

 

If not NRF_SUCCESS, I suspect NRF_ERROR_INVALID_STATE. If so, I think you are missing something that needs to be set up in the ble_nus_c setup. Compare your project with the ble_app_uart example. A keyword is p_client->is_notification_enabled in ble_nus.c.

 

But first check what ble_nus_data_send() returns.

 

BR,

Edvin

[arshdeep]

Hello Edvin,

How can i check the return value ? I am getting 0x00000005 as error code in te return value. 

Thanks,