Esp32 modbus tcp slave

#include "mbed.h"
#include "modbustcp.h"
#include "EthernetInterface.h"
#include "stdio.h"
Serial pc(USBTX, USBRX);
DigitalOut led1(LED1);
DigitalOut led2(LED2);
DigitalOut led3(LED3);
DigitalOut led4(LED4);

int main() {
    EthernetInterface eth;
    eth.init();
    eth.connect();
    printf("IP Address is %s\n", eth.getIPAddress());
    ModbusTCPSlave slave(TCPSOCKET_PORT);
    //set coils start address (1:output coil,0:input coil)
    slave.setCoilStartAddress(0x00,0x00);
    
    //set discrete input start address (1:output coil,0:input coil)
    slave.setDiscreteInputStartAddress(0x00,0x00);
    
    //set holding registers start address (1:input reg,0:output reg)
    slave.set