Hi Gordon
I try to use the new UDP/Broadcast feature. First to receive UDP packages/messages.

Here is the code on the serverside, nodejs on linux. It sends a small JSON string every 10 seconds:
Please replace "BROADCAST_ADDR" with yours.

var PORT = 7077;
var BROADCAST_ADDR = "192.168.68.255";
var dgram = require('dgram');
var server = dgram.createSocket("udp4");

server.bind(function() {
    server.setBroadcast(true);
    setInterval(broadcastNew, 10000);
});

function broadcastNew() {
    var msg=JSON.stringify({ type: "SYS", name : "_M", cfg: 187 });
    var message = new Buffer(msg);
    server.send(message, 0, message.length, PORT, BROADCAST_ADDR, function() {
        console.log("Sent '" + message + "'");
    });
}

Please start it with node:

node test.js

And now, this is the code running on EspruinoWiFi. Please replace your WLAN SSID and PW:

/*
ESPRUINO WIFI
*/
var WIFI_NAME = "Paradise";
var WIFI_OPTIONS = { password : "XYZ" };
var PORT = 7077;
var wifi = require("EspruinoWiFi");
var dgram = require('dgram');
var client = dgram.createSocket("udp4");

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

        client.on('listening', function () {
            var address = client.address();
            console.log('UDP Client listening on ' + address.address + ":" + address.port);
            client.setBroadcast(true);
        });

        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);
    });
});

Please type "save" on the EspruinoWiFi.

Espruino receives packets. They are often corrupt, not complete or even from a wrong IP Address ??
It's a question of time, then the espruino is crashing.

____                 _
|  __|___ ___ ___ _ _|_|___ ___
|  __|_ -| . |  _| | | |   | . |
|____|___|  _|_| |___|_|_|_|___|
         |_| espruino.com
 1v96 (c) 2017 G.Williams
>
=undefined
>save();
=undefined
Compacting Flash...
Calculating Size...
Writing..
Compressed 114368 bytes to 27188
Connected: 192.168.68.158
UDP Msg: 192.168.68.13:39242 - {"type":"SYS","name":"_M","cfg":187}
OK:187
UDP Msg: 77.34.44.34:26211 - :187}
ERR: UPD packet not JSON, ignore
UDP Msg: 192.168.68.13:39242 - {"type":"SYS","name":"_M","cfg":187}
OK:187
UDP Msg: 192.168.68.13:39242 - {"type":"SYS","name":"_M","cfg":18
ERR: UPD packet not JSON, ignore
>

Thanks for your help.

Sacha