How to measure temperature and sync to AWS IoT

send-temperature-to-aws.js

'use strict';

console.log('Running...');

const SerialPort = require('serialport');
const Readline = require('@serialport/parser-readline')

const portName = '/dev/ttyACM0';
const port = new SerialPort(portName, (err) => {
	if (err) {
		return console.log('Error: ', err.message);
	}
});

const deviceModule = require('aws-iot-device-sdk').device;

const parser = port.pipe(new Readline({ delimiter: '\r\n' }));
const rePattern = new RegExp(/C: (.+)F:(.+)/);

parser.on('data', (data) => {
	const arrMatches = data.match(rePattern);

	if(arrMatches && arrMatches.length >= 1) {
		const readingInC = arrMatches[1].trim();
		console.log(readingInC);

		sendDataToTheNube(readingInC);
	}
});

const defaults = {
	protocol: 'mqtts',
	privateKey: './iot/f5b0580f5c-private.pem.key',
	clientCert: './iot/f5b0580f5c-certificate.pem.crt',
	caCert: './iot/root-CA.crt',
	testMode: 1,
	/* milliseconds */
	baseReconnectTimeMs: 4000,
	/* seconds */
	keepAlive: 300,
	/* milliseconds */
	delay: 4000,
	thingName: 'cuttlefish-hub-01',
	clientId: 'nouser' + (Math.floor((Math.random() * 100000) + 1)),
	Debug: false,
	Host: 'a7773lj8lvoid9a.iot.ap-southeast-2.amazonaws.com',
	region: 'ap-southeast-2'
};

function sendDataToTheNube(readingInC) {
	const device = deviceModule({
	      keyPath: defaults.privateKey,
	      certPath: defaults.clientCert,
	      caPath: defaults.caCert,
	      clientId: defaults.clientId,
	      region: defaults.region,
	      baseReconnectTimeMs: defaults.baseReconnectTimeMs,
	      keepalive: defaults.keepAlive,
	      protocol: defaults.Protocol,
	      port: defaults.Port,
	      host: defaults.Host,
	      debug: defaults.Debug
	});

	device.publish(`temperature/${defaults.thingName}`, JSON.stringify({
		temperature: readingInC
	}));
}