nRF Uart v2.0 not Receiving

[Nick]

I am using the eval board, sdk v5.2.0, s110 v5.0 and a galaxy nexus with the UART Nordic app. I have not been able to receive any data on the android end. After

void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)

is called i turn toggle an led. I can verifty that when i type something in my android device that it receives the message because the led will toggle. However i never get any messages back.

Much Thanks,

Nick

[Vidar Berg]

Hi, are you using a terminal on your computer to pick up the data received by your board? There is no automatic echoing implemented in ble_app_uart, so it does in other words not respond to received strings via ble. There is a startup message on the board, but it is only sent over the UART when the application starts.

Assuming that you didn't use a terminal. What you need to do is opening the corresponding com port in a terminal with 38400 baud rate and 1 stop bit.

Best regards,

Vidar

Edit: Code snippet to echo rx data to tx

void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
  {  
      uint32_t err_code;
      /*Echo incoming data*/
      err_code = ble_nus_send_string(&m_nus, p_data, length);

      //err_code = ble_nus_send_string(&m_nus, p_data, length);
      
      if (err_code != NRF_ERROR_INVALID_STATE)
         {
              APP_ERROR_CHECK(err_code);
         }
   }

[Nick]

My intentions were to use the ble uart app on the phone to help debug a non-connected device. I am not able to use USB-UART also because this is a production device not a dev board.

So am i correct in understanding that the UART v2.0 app for android is not capable of receiving just sending? The screenshots of the app in the app store demonstrate RX not just TX. Is the app not supposed to send a string over bluetooth and receive the same string over bluetooth from the nRF? This is my point of confusion when you say "it does in other words not respond to received strings via ble".