Can't proproly recive commands form mobil

[ChernoBilly69]

I'm just trying to make a simple communicatión between my nrf52 dk and my mobil using Serial Bluetooth Terminal app. I took the ble_app_uart example and I added a function that turn on or off the Led 2 if the DK recives a 'a' or a 's', but I don't know why it didn't work, and I can't find out where is the error.

The only thing I changed is the for loop for a while loop, where I added the idle_state_handle function and the function I developed  

static void communication(void)
{
	uint8_t command;
	
	while(app_uart_get(&command) != NRF_SUCCESS);
	
	if(command == 'a')
	{
		bsp_board_led_on(1);
		printf("Leds turned on!!\r\n");
	}
	else if(command == 's')
	{
		bsp_board_led_off(1);
		printf("Leds turned off!!\r\n");
	}
	else
	{
		printf("Invalid command!!\r\n");
	}
	
}

[Kenneth]

I suggest to contine the debugging, for new development you should check out the nRF Connect SDK.

Start with https://academy.nordicsemi.com/ and the follow up with https://webinars.nordicsemi.com/developing-bluetooth-low-energy-6 

[ChernoBilly69]

Okay, I finaly solve it. In the nus_data_handler function I implement this code for the reciving command part:

static void nus_data_handler(ble_nus_evt_t * p_evt) // data handler
{
	char letra = 0;
	
  if (p_evt->type == BLE_NUS_EVT_RX_DATA)
  {
		
    NRF_LOG_DEBUG("Received data from BLE NUS. Writing data on UART.");
    NRF_LOG_HEXDUMP_DEBUG(p_evt->params.rx_data.p_data, p_evt->params.rx_data.length);

    for (uint32_t i = 0; i < p_evt->params.rx_data.length; i++)
		{            
			letra = p_evt->params.rx_data.p_data[i];
			if(letra == 97)
			{
				bsp_board_led_on(3);
			}
			if(letra == 98)
			{
				bsp_board_led_off(3);
			}
		}
    if (p_evt->params.rx_data.p_data[p_evt->params.rx_data.length - 1] == '\r')
    {
			while (app_uart_put('\n') == NRF_ERROR_BUSY);
    }
	}
}

And then, to send messages to the DK I implement this one:

static void send_command(uint8_t data_array[BLE_NUS_MAX_DATA_LEN]) // data sending
{

	uint32_t err_code;
	
	idle_state_handle();
	
	uint16_t length = 0; // data_array length
	
	for(int i=0; i<BLE_NUS_MAX_DATA_LEN; i++)
	{
		if(data_array[i] != 0)
		{
			length ++;
		}
	}
	
  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_RESOURCES) && (err_code != NRF_ERROR_NOT_FOUND))
	{
		APP_ERROR_CHECK(err_code);
  }
}