@canboat/canboatjs
Version:
Native javascript version of canboat
100 lines • 3.96 kB
JavaScript
;
const Transform = require('stream').Transform;
const mqtt = require('mqtt');
const debug = require('debug')('venus-mqtt');
//const pgns = require('./fromPgn').pgns
const _ = require('lodash');
function MQTTStream(options) {
Transform.call(this, {
objectMode: true
});
this.options = options;
}
require('util').inherits(MQTTStream, Transform);
MQTTStream.prototype.discoveryAvailable = function () {
return moduleAvailable('md' + 'ns');
};
MQTTStream.prototype.pipe = function (pipeTo) {
const that = this;
this.startDiscovery()
.then((service) => {
let url = service.txtRecord.mqtt_broker;
var client = mqtt.connect(url);
client.on('connect', function () {
debug(`connected to ${url}`);
client.subscribe('n2k/mqtt_n2k/self');
//client.subscribe('n2k/mqtt_n2k/listenpgns')
client.publish('n2k/mqtt_n2k/getself');
client.publish('n2k/mqtt_n2k/addpgn', '129026');
client.publish('n2k/mqtt_n2k/addpgn', '129025');
//client.publish('n2k/mqtt_n2k/getlistenpgns')
client.subscribe('n2k/mqtt_n2k/bus/#');
/*
pgns.forEach(key => {
debug(`adding pgn ${key}`)
client.publish('n2k/mqtt_n2k/addpgn', key)
//require('sleep').msleep(100)
})
*/
});
client.on('error', (error) => {
this.options.app.setProviderError(`error connecting to mqtt ${error}`);
});
client.on('close', () => {
this.options.app.setProviderError(`mqtt close`);
});
client.on('reconnect', () => {
//this.(`mqtt reconnect`)
});
client.on('message', (topic, json) => {
debug(`${topic}: '${json}'`);
const pgn = JSON.parse(json);
if (topic.startsWith('n2k/mqtt_n2k/bus/')) {
that.push(pgn);
}
});
})
.catch((error) => {
debug(error);
this.options.app.setProviderStatus(error.msg);
});
Transform.prototype.pipe.call(this, pipeTo);
};
MQTTStream.prototype.startDiscovery = function () {
var that = this;
return new Promise(function (resolve, reject) {
if (!that.discoveryAvailable()) {
console.log('Discovery requires mdns or specify hostname and port');
reject('Discovery requires mdns');
}
var mdns = require('md' + 'ns');
function doStart(serviceName) {
let browser = mdns.createBrowser(mdns.tcp(serviceName), {
resolverSequence: [mdns.rst.DNSServiceResolve()]
});
browser.on('serviceUp', function (service) {
debug(`Discovered ${serviceName}:` + JSON.stringify(service, null, 2));
//that.get('/signalk', service.host, service.port, isHttps ? 'https' : 'http').then(function(response) {
debug(`Service at ${service.host}:${service.port} ${service.txtRecord.base_topic}`);
resolve(service);
});
debug(`Starting ${serviceName} discovery`);
browser.start();
return browser;
}
this.browser = doStart('mqtt-n2k');
});
};
MQTTStream.prototype._transform = function (_data, _encoding, _callback) { };
function moduleAvailable(name) {
try {
require.resolve(name);
return true;
// eslint-disable-next-line no-empty
}
catch (_e) { }
return false;
}
module.exports.VenusMQTT = MQTTStream;
//const pgns = [ '126992','127505','129029','129291','130312','127245','127506','129038','129793','130314','127250','127508','129039','129794','130577','127251','128259','129040','129809','130842','127257','128267','129041','129810','127258','128275','129283','130306','127488','129025','129284','130310','127489','129026','129285','130311']
//# sourceMappingURL=venus-mqtt.js.map