How can controll my flight controller from esp32?

1

Hello! I want use esp32 as reciever for a controll my flight controller (f 405).
I need to connect by UART and send THROTTLE, PITCH and others. I have used protocol mavlink.

This is code for ESP32:

#include <Arduino.h>
#include <HardwareSerial.h>
#include <mavlink.h>

#define UART_TX_PIN 17
#define UART_RX_PIN 16

HardwareSerial SERIAL_PORT (1);

void setup() {
  Serial.begin(115200); 
   SERIAL_PORT.begin(115200, SERIAL_8N1, UART_RX_PIN, UART_TX_PIN);

  delay(5000); 
  }

void loop() {
   uint16_t throttle_value = 1500;

  mavlink_message_t msg;
  uint8_t buf[MAVLINK_MAX_PACKET_LEN];

  mavlink_msg_rc_channels_override_pack(0xFF, 0xBE, &msg, 1, 1, 0, 0, 0, 0, throttle_value, 0, 0, 0);
  uint16_t len = mavlink_msg_to_send_buffer(buf, &msg);
  SERIAL_PORT.write(buf, len);

    delay(1000);
    }

But this is code dont start the motors. Maybe problem on the code or no... I dont understand. So thank for any help.