Mavlink drone to sygic connector, uses GPS coordinates from 3DR drone streamed over 433 MHz link in sygic navigation

mavlink_sygic.js

// setup
var portaddr = "COM68";
var sygic = "10.0.10.68";

// main
var SerialPort = require("serialport");
var mavlink = require('mavlink');
var mav = new mavlink(1,1);
var WebSocketClient = require('websocket').client;
var client = new WebSocketClient();
var wsConnection = false;
var port = false;

// mavlink
mav.on("ready", function() {

  port = new SerialPort(portaddr, {
    baudRate: 57600
  });

  port.on('open', function() {
    console.log("Port opened");
    onMavReady();
  });

  port.on('data', function(data) {
      mav.parse(data);
  });

  mav.on("message", function(message) {
//     console.log(mav.getMessageName(message.id) + "  " + JSON.stringify(message));
  });

  mav.on("GPS_RAW_INT", function(message, fields) {
    var metersPerSecond = fields.vel / 100;
    var kmh = fields.vel / 1000 * 3600;

    var speed = {raw: fields.vel, speed:metersPerSecond, kmh:kmh};
//    console.log(speed);

    if ( wsConnection )  
      wsConnection.sendUTF("GPS.SetSpeed("+kmh.toFixed(2)+");\n");
   });

   mav.on("GLOBAL_POSITION_INT", function(message, fields) {
     var coord = {lat:fields.lat/1e7, lon:fields.lon/1e7, heading:fields.hdg/100};
     console.log(coord);
     if ( wsConnection )
     {
       wsConnection.sendUTF("GPS.SetCourse("+coord.heading.toFixed(1)+");\n");
       wsConnection.sendUTF("GPS.SetPosition("+Math.floor(coord.lon*100000)+","+Math.floor(coord.lat*100000)+");\n");
     }
   });

});	

// sygic
client.on('connectFailed', function(error) {
    console.log('Connect Error: ' + error.toString());
});
 
client.on('connect', function(connection) {
    console.log('WebSocket Client Connected');
    wsConnection = connection;

    connection.on('error', function(error) {
        console.log("Connection Error: " + error.toString());
    });
    connection.on('close', function() {
        console.log('echo-protocol Connection Closed');
    });
    connection.on('message', function(message) {
        if (message.type === 'utf8') {
            console.log("Received: '" + message.utf8Data + "'");
        }
    });
});
 
// debug
function onMavReady()
{
  client.connect("ws://"+sygic+":38950/");

//  mav.createMessage("MISSION_REQUEST_LIST", {target_system:1, target_component:1}, function(message) { port.write(message.buffer); });
//  mav.on("MISSION_COUNT", function(message, fields) { console.log(fields); });

  var nav_commands = [];
  nav_commands[16] = "MAV_CMD_NAV_WAYPOINT";
  nav_commands[20] = "MAV_CMD_NAV_RETURN_TO_LAUNCH";
  nav_commands[22] = "MAV_CMD_NAV_TAKEOFF";

  //mav.createMessage("MISSION_REQUEST", {target_system:1, target_component:1, seq:2}, function(message) { port.write(message.buffer); });
  //mav.on("MISSION_ITEM", function(message, fields) { console.log(nav_commands[fields.command]); console.log(fields); });
}