app2.js

const WebSocket = require('ws');
const wss = new WebSocket.Server({
  port: 3000
});
var names_con = [];
var names_dis = [];
var lookup_dis = {};
var lookup_con = {};

wss.on('connection', function connection(ws) {
  console.log('Verbindung von Client');



  ws.on('message', function incoming(data) {
    console.log("Neue Nachricht: " + data);
    var obj = JSON.parse(data);
    switch (obj.id) {


      case "LOGIN":


        if (typeof obj.name !== "undefined" && obj.name != "") {
          console.log(obj.name + " has logged in");

          if (names.includes(obj.name) || obj.name == "temp") {
            console.log("name schon vorhanden");
            lookup_dis["temp"] = ws;
            lookup_dis["temp"].send(JSON.stringify({
              id: "LOGIN_ATTEMPT",
              confirm: "false"
            }));
            delete lookup_dis["temp"];

          } else {

            if (obj.device == "1") {
              lookup_con[obj.name] = ws;
              names.push(obj.name);
              lookup_con[obj.name].send(JSON.stringify({
                id: "LOGIN_ATTEMPT",
                confirm: "true"
              }));

              console.log("logged in as controller");
            }
            if (obj.device == "2") {
              lookup_dis[obj.name] = ws;
              names.push(obj.name);
              lookup_dis[obj.name].send(JSON.stringify({
                id: "LOGIN_ATTEMPT",
                confirm: "true"
              }));

              console.log("logged in as display");
            }
          }


        } else {
          console.log("name is undefined or empty");
        }



        break;
      case "SEND_TO":


        if (typeof obj.to_name !== "undefined" && obj.to_name != "" && typeof lookup[obj.to_name] !== "undefined") {
          console.log("send to " + obj.to_name + " this message: " + obj.msg);
          lookup[obj.to_name].send(obj.msg);
        } else {
          console.log("user ist not avilable");
        }
        break;
      case "Ask Controldler":
        if (typeof obj.con1 !== "undefined" && obj.con1 != "" && typeof lookup_con[obj.con1] !== "undefined" &&
          typeof obj.con2 !== "undefined" && obj.con2 != "" && typeof lookup_con[obj.con2] !== "undefined" && obj.con1 !== obj.con2) {
          lookup_con[obj.con1].send(obj.name + " want to connect");
          lookup_con[obj.con2].send(obj.name + " want to connect");
        }

        break;
      case "Display":
        while (true) {
          var name = Math.floor(Math.random() * (9999 - 1000) + 1000);
          if (names_dis.includes(String(name)) !== true) {


            lookup_dis[String(name)] = ws;
            names_dis.push(String(name));
            lookup_dis[String(name)].send(JSON.stringify({
              id: "LOGIN",
              name: String(name)
            }));

            console.log("New Display : " + name);
            break;

          }
        }
        break;
      case "CONTROLLER":
        if (typeof obj.name !== "undefined" && obj.name != "" && names_dis.includes(obj.name)) {
          if (names_con.includes(obj.name + obj.orien)) {
            if (obj.orien == "_right") {
              if (names_con.includes(obj.name + "_left")) {
                lookup_con["temp"] = ws;
                lookup_con["temp"].send(JSON.stringify({
                  id: "CONTROLLER",
                  orien: "nothing"
                }));
                delete lookup_con["temp"];
              } else {
                names_con.push(obj.name + "_left");
                lookup_con[(obj.name + "_left")] = ws;
                lookup_con[(obj.name + "_left")].send(JSON.stringify({
                  id: "CONTROLLER",
                  orien: "_left"
                }));
                //___________________
                lookup_dis[obj.name].send(JSON.stringify({
                  id: "CONTROLLER CONNECT",
                  orien: "_left"
                }));
                console.log(obj.name + "_left");
              }
            } else {
              if (names_con.includes(obj.name + "_right")) {
                lookup_con["temp"] = ws;
                lookup_con["temp"].send(JSON.stringify({
                  id: "CONTROLLER",
                  orien: "nothing"
                }));
                delete lookup_con["temp"];
              } else {
                names_con.push(obj.name + "_right");
                lookup_con[(obj.name + "_right")] = ws;
                lookup_con[(obj.name + "_right")].send(JSON.stringify({
                  id: "CONTROLLER",
                  orien: "_right"
                }));
                //______________________
                lookup_dis[obj.name].send(JSON.stringify({
                  id: "CONTROLLER CONNECT",
                  orien: "_right"
                }));
                console.log(obj.name + "_right");
              }
            }
            //Send back (faliure)
          } else {
            names_con.push(obj.name + obj.orien);
            lookup_con[(obj.name + obj.orien)] = ws;
            lookup_con[(obj.name + obj.orien)].send(JSON.stringify({
              id: "CONTROLLER",
              orien: obj.orien
            }));
            console.log(obj.name + obj.orien);
            //___________________
            lookup_dis[obj.name].send(JSON.stringify({
              id: "CONTROLLER CONNECT",
              orien: obj.orien
            }));
          }
        } else {
          lookup_con["temp"] = ws;
          lookup_con["temp"].send(JSON.stringify({
            id: "CONTROLLER",
            orien: "nothing"
          }));
          delete lookup_con["temp"];
        }
        break;
      case "GO":
        if (typeof obj.name !== "undefined" && obj.name != "" && names_dis.includes(obj.name) && names_con.includes(obj.name + "_right") && names_con.includes(obj.name + "_right")) {
          lookup_con[obj.name + "_left"].send(JSON.stringify({
            id: "GO"
          }));
          lookup_con[obj.name + "_right"].send(JSON.stringify({
            id: "GO"
          }));
        } else {
          console.log("Error");
        }
        break;
      case "GAME":
        if (typeof obj.name !== "undefined" && obj.name != "" && names_dis.includes(obj.name)) {
          lookup_dis[obj.name].send(JSON.stringify({
            id: "GAME",
            orien: obj.orien,
            y: obj.y
          }))
        }
        break;

    } //switch


  });


});