EspruinoWiFi - UDP / Broadcast not stable

"listening" is not implemented. Espruino code reduced to:

/*
ESPRUINO WIFI
*/
var WIFI_NAME = "Paradise";
var WIFI_OPTIONS = { password : "XYZ" };
var PORT = 7077;
var wifi = require("EspruinoWiFi");
var dgram = require('dgram');
wifi.connect(WIFI_NAME, WIFI_OPTIONS, function (err) {
    if (err) {
        console.log("Connection error: " + err);
    }
    wifi.getIP(function (f, ip) {
        console.log("Connected: " + ip.ip);
        // UDP Broadcast
        var client = dgram.createSocket("udp4");

        client.on('message', function (message, rinfo) {
            console.log('UDP Msg: ' + rinfo.address + ':' + rinfo.port +' - ' + message);
            try {
                var u = JSON.parse(message);
                console.log('OK:'+u.cfg);
            }
            catch(err) {
                console.log('ERR: UPD packet not JSON, ignore');
            }
        });
        client.bind(PORT);
    });
});