index.js

/*
 * MIT License
 * 
 * Copyright (c) 2018 Fabvalaaah - fabvalaaah@laposte.net
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * 
 * DONATION:
 * As I share these sources for commercial use too, maybe you could consider
 * sending me a reward (even a tiny one) to my Ethereum wallet at the address
 * 0x1fEaa1E88203cc13ffE9BAe434385350bBf10868
 * If so, I would be forever grateful to you and motivated to keep up the good
 * work for sure :oD Thanks in advance !
 * 
 * FEEDBACK:
 * You like my work? It helps you? You plan to use/reuse/transform it? You have
 * suggestions or questions about it? Just want to say "hi"? Let me know your
 * feedbacks by mail to the address fabvalaaah@laposte.net
 * 
 * DISCLAIMER:
 * I am not responsible in any way of any consequence of the usage
 * of this piece of software. You are warned, use it at your own risks.
 */

/* 
 * File:   index.js
 * Author: Fabvalaaah
 *
 * 02/20/2018
 */

'use strict';

const SerialPort = require('serialport');
const MQTT = require('mqtt');
const ReadLineItf = require('readline').createInterface;

const setup = require('./setup');
const mqttClient = MQTT.connect(setup.mqtt);
/*
 * Common port list:
 * /dev/tty.usbserial-A9007UX1 ---> Mac OS X
 * /dev/ttyACM0 ---> Linux (Raspberry Pi)
 * /dev/ttyUSB0 ---> Linux (Ubuntu)
 * COM3 ---> Windows
 */
const serial = new SerialPort(setup.port, {baudRate: setup.rate});
const serialReader = ReadLineItf({
    input: serial
});

// Serial listener (serial --> MQTT)
serialReader.on('line', function (value) {
    console.log('out --> [' + value + ']');
    mqttClient.publish(setup.tout, value, {qos: setup.qos}); // MQTT pub
});
// -------

// MQTT subscriber (MQTT --> serial)
mqttClient.on('connect', function () {
    mqttClient.subscribe(setup.tin); // MQTT sub
});

mqttClient.on('message', function (topic, message) {
    let value = message.toString();
    console.log('[' + value + '] --> in');
    serial.write(value + '\n');
});
// -------