sockets, how many connections are allowed in a port?

I have this script in nodejs. it works in the following way, I have three gps, which point to my server, at the moment I had to make my ip public and I have assigned a port where the GPS data will arrive.

'use strict'

const net = require('net');
const port = 2345;
const host = '192.168.15.12';
const server = net.createServer();

server.listen(port, host, () => {
console.log('TCP Server is running on port ' + port + '.');
});
  let sockets = [];
 server.on('connection', function (sock) {
//console.log('CONNECTED: ' + sock.remoteAddress + ':' + sock.remotePort);
sockets.push(sock);

sock.on('data', function (data) {
    data = String(data);
    console.log(typeof (data));
   console.log('DATA ' + sock.remoteAddress + ': ' + data);

 if (typeof (data) != "string") {
        console.log("Error 1");
    }
    if (data.length < 19) {
        console.log("Error 2");
    }
    if (data[0] != '(' && data[data.length - 1] != ')') {
        console.log("Error 3");
    } else {

        var ID = data.substr(1, 1 + 11);
        var Comando = data.substr(13, 4);
        console.log("ID: " + ID);
        console.log("Comando: " + Comando);

        if (Comando == "BR00") {

            //Fecha
            var offset = 17;
            var offset_end = 6;
            var date = data.substr(offset, offset_end);
            console.log("Fecha: " + date);

            //Disponibilidad
            offset = 23;
            offset_end = 1;
            var disponibilidad = data.substr(offset, offset_end);
            console.log("Dispo: " + disponibilidad);

            //Latitud
            offset = 24;
            offset_end = 9;
            var lat = data.substr(offset, offset_end);
            console.log("Latitud: " + lat);

            //Indicador de latitud
            offset = 33;
            offset_end = 1;
            var lat_in = data.substr(offset, offset_end);
            console.log("Indicador lat: " + lat_in);

            //Longitud
            offset = 34;
            offset_end = 10;
            var lng = data.substr(offset, offset_end);
            console.log("Longitud: " + lng);

            //Indicador de longitud
            offset = 44;
            offset_end = 1;
            var lng_in = data.substr(offset, offset_end);
            console.log("Indicador lng: " + lng_in);

            //Velocidad
            offset = 45;
            offset_end = 5;
            var Velocidad = data.substr(offset, offset_end);
            console.log("Velocidad: " + Velocidad);

            //Hora
            offset = 50;
            offset_end = 6;
            var hora = data.substr(offset, offset_end);
            console.log("Hora: " + hora);

            if (disponibilidad = "A") {
                var lat_dd = parseFloat(lat.substr(0, 2)) + parseFloat(lat.substr(2, 9)) / 60;
                if (lat_in != "N") {
                    lat_dd = -lat_dd;
                }
                var lng_dd = parseFloat(lng.substr(0, 3)) + parseFloat(lng.substr(3, 10)) / 60;
                if (lat_in != "E") {
                    lng_dd = -lng_dd;
                }
                console.log("Lat: " + lat_dd);
                console.log("Lon: " + lng_dd);
                if ( ID === '027045706256') {
                    console.log("gps1:" + "Lat: " + lat_dd + "Lon: " + lng_dd );
                }else if(ID === '027045706173'){
                    console.log("gps 2:" + "Lat: " + lat_dd + "Lon: " + lng_dd );
                }
            }
        }

    }

    // Write the data back to all the connected, the client will receive it as data from the server
    sockets.forEach(function (sock, index, array) {
        sock.write(sock.remoteAddress + ':' + sock.remotePort + " said " + data + '\n');
    });
});

// Add a 'close' event handler to this instance of socket
sock.on('close', function (data) {
    let index = sockets.findIndex(function (o) {
        return o.remoteAddress === sock.remoteAddress && o.remotePort === sock.remotePort;
    })
    if (index !== -1) sockets.splice(index, 1);
    console.log('CLOSED: ' + sock.remoteAddress + ' ' + sock.remotePort);
});
});

doing the tests in local works well with 3 gps. Based on this I have several doubts.