Advantech adam ASCII modbus UDP emulator for synology surveillance station (nodejs)

adam6050.js

var dgram = require('dgram');
var server = dgram.createSocket('udp4');

server.on('listening', function () {
    var address = server.address();
    console.log('Advantech ADAM emulator running on UDP ' + address.address + ":" + address.port);
});

server.on('message', function (message, remote) {
  var request = message.toString();
  var response = "";

  if ( request.substr(0, 5) == "$01PW" )
    response = ">01\r";

  if ( request == "$01C\r" )
    response = "!01" + "000000000000" + "000000000000" + "000000000000" + "\r";
  else
  if ( request.substr(0, 4) == "$01C" )
    response = ">\r";

  if ( request == "$016\r" )
    response = ((((new Date()).getTime()/1000) % 30) <= 5) ? 
      "!01"+"01"+"FFFF\r" :  // address, outputs, inputs
      "!01"+"00"+"FFFF\r";

  if ( request.substr(0, 4) == "#011" )
  {
    console.log("Channel[0x"+request.substr(4, 2)+"] = " +request.substr(6, 1));
    response = ">\r";
  }

  if (response != "")
  {
    server.send(new Buffer(response), 0, response.length, remote.port, remote.address, function(err)
    {
      if (err) 
        console.log(err);
    });
  }

  console.log(remote.address + ": '" + 
    request.replace("\r", "") + "' -> '" + 
    response.replace("\r", "") + "'");
});

server.bind(1025);

Any notes on how to use this? This could be really helpful if it could help other devices interface with SS. Thanks for the start.

THX A LOT! This is exactly what i was looking 4!