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]

Much Thanks Vidar, we are designing the firmware in two stages. In stage one we are writing drivers for multiple sensors and testing the each of them using the BLE UART. We would like to send sensor and debug data to the UART Android App for this stage. In the second stage we will be developing a custom BLE service and profile to send the data more efficiently and hence removing BLE UART.

Is there an example which does both RX and TX to the android device? Our production device does not have the necessary UART over USB hardware and this would save us quite a bit of time if it worked.