modbus tcp esp8266

#include <ESP8266WiFi.h>
#include <ModbusTCPSlave.h>
#include <Ticker.h>
#include "EmonLib.h"                   // Include Emon Library
EnergyMonitor emon1;                   // Create an instance


//Settings IP Nodemcu
byte ip[]      = { 192, 168, 43, 187};
byte gateway[] = { 192, 168, 43, 1 };
byte subnet[]  = { 255, 255, 255, 0 };

ModbusTCPSlave Mb;
Ticker Stop;

const int ledPin =  4; 
const int inputPin =  12; 
//const int analogInPin = A0;


void monitoring() {
 double Irms = emon1.calcIrms(1480);

///Digital Inputs
Mb.MBHoldingRegister[0]=digitalRead(inputPin);

///Digital Outputs
digitalWrite(ledPin,Mb.MBHoldingRegister[1] );

////Analog Input
Mb.MBHoldingRegister[2] = Irms *100;//scaling 0.01
 
  }

void setup()
{
 emon1.current(0, 65.1); 
 pinMode(ledPin, OUTPUT);
 pinMode(inputPin, INPUT);
 Serial.begin(115200);
 Mb.begin("puaks.blogspot.com", "puakpipop", ip, gateway, subnet);
 delay(100);

}

void loop()
{
 
  Mb.Run();
 Stop.attach_ms(25,monitoring);
 
}