Simple javascript/node module to Handle KEBA P30 WallBox UDP command

KEBA-Wallbox-UDP-Command.js

'use strict';

// Author   : Fulup Ar Foll
// Date     : July-2018
// Licence  : What ever please you until you fixe bug by yourself
// Object   : Handle KEBA P30 WallBox UDP command
// Reference: https://www.keba.com/web/downloads/e-mobility/KeContact_P20_P30_UDP_ProgrGuide_en.pdf
// Debug    : echo -n "report"  | socat - UDP:KEBA:7090,bind=:7090,bindtodevice=eth0
//            where: KEBA=IP-ADDR eth0 the internet interface when you send/receive data

// usage: 
//    node KEBA-UDP-CLI.js --discovery (broadcast "i" command to every existing KEBA on the network)
//    node KEBA-UDP-CLI.js --address=X.X.X.X --command="keba-command" execute command and display result

// Example:
//    node KEBA-UDP-CLI.js --address=keba-addr --command=i
//    node KEBA-UDP-CLI.js --address=keba-addr --command='report 1'

// Bugs: 
//   - do not forget to set UDP DIP switch
//   - my P30 does not respond to broadcast packet ???
//   - Kena Wallbox does not return error or warning when a wrong command is sent

var udpPort=7090;             // KEBA UDP port
var broadcast = "255.255.255.255";
var discovery = false;
var kebaAddr = false;
var command = false;

if (process.argv.length <= 2) {
    console.log('\nKEBA-UDP-CLI: use --help to get options\n');
    process.exit();
}

var dgram = require('dgram');
var client = dgram.createSocket('udp4');
var addr; // adapter address at discovery


// loop on arguments
for (var idx=1; idx < process.argv.length; idx++) {

    // ingore any argument not starting with '--'
    if (!process.argv[idx].startsWith("--")) continue;

    var cmd=process.argv[idx].split('=');

    switch (cmd[0]) {
        case "--discovery": 
        case "--D": 
            discovery=true;
            break;

        case "--address": 
        case "--A": 
            kebaAddr=cmd[1];
            break;

        case "--command": 
        case "--C":
            command = new Buffer(cmd[1]);
            break;

        default:
            console.log('\n KEBA-UDP-CLI: Unknown Argument: ' + cmd + '\n');
            process.exit(1);
    }
}

client.on('listening', function () {
    var listenaddr = client.address();
    if (discovery) {
        client.setBroadcast(true);
        command = new Buffer("i");
        kebaAddr= broadcast;
        console.log('KEBA-UDP-CLI: use CTL-C to exist discovery mode');
    } else {

        if (!kebaAddr || !command) {
           console.log('\nKEBA-UDP-CLI: should use (--discovery) or (--address=X.X.X.X and --command=xxxx)\n');
            process.exit(1);
        }   
    }
    console.log('\nKEBA-UDP-CLI: listening on ' + listenaddr.address + ":" + listenaddr.port);

    client.send(command, 0, command.length, udpPort, kebaAddr);
    console.log('KEBA-UDP-CLI: sending command=' +command);

});

client.on('message', function (message, rinfo) {    
    
 

    console.log('KEBA-UDP-CLI: Message from: ' + rinfo.address + ':' + rinfo.port +' - length=' + message.length);
    console.log(message.toString());

    if (!discovery) {
        process.exit(0);
    }
});

client.bind(udpPort);