I want to send data from nrf51822 through UART TX to esp8266.

[ej_junior]

Hello, 

I am trying to send data from nrf51822 through UART TX to esp8266. I've gone through the app_uart examples and I can recieve data through RX but having difficulty sending data through TX.

[ej_junior]

I managed to get it working by changing APP_UART_FLOW_CONTROL_ENABLE to 

APP_UART_FLOW_CONTROL_DISABLED

static void uart_init(void)
{
    uint32_t                     err_code;
    const app_uart_comm_params_t comm_params =
    {
        RX_PIN_NUMBER,
        TX_PIN_NUMBER,
        RTS_PIN_NUMBER,
        CTS_PIN_NUMBER,
        APP_UART_FLOW_CONTROL_DISABLED,
        false,
        UART_BAUDRATE_BAUDRATE_Baud9600
    };

    APP_UART_FIFO_INIT( &comm_params,
                       UART_RX_BUF_SIZE,
                       UART_TX_BUF_SIZE,
                       uart_event_handle,
                       APP_IRQ_PRIORITY_LOWEST,
                       err_code);
    APP_ERROR_CHECK(err_code);
}

[awneil]

Yes, that would do it!

Now please verify the answer: