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PurpleRose 4 years ago
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  1. 15
      package.json
  2. 68
      producer.js

15
package.json

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{
"name": "myproducer",
"version": "1.0.0",
"description": "",
"main": "producer.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC",
"dependencies": {
"amqplib": "^0.6.0",
"serialport": "^9.0.4"
}
}

68
producer.js

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//Requiered modules
const amp = require('amqplib');
const serialPort = require('serialport');
//Serial port initialization
var port = new serialPort('/dev/ttyUSB0', { baudRate: 9600, });
//RabbitMQ Settings initialization
const rabbitmqSettings = {
protocol: 'amqp',
hostname: 'localhost',
port: 5672,
username: 'iotproject',
password: 'iotproject',
vhost: '/',
authMechanism: ['PLAIN', 'AMQPLAIN', 'EXTERNAL']
}
//The main function (connect), implement all the functionality for the purpose of reading the serial port and send the data to the broker (tempValues) queue...
async function connect() {
const queue = 'tempValues'; //RabbitMQ queue name...
try {
//apply the RabbitMQ settings to create a link between the producer and the queue...
const conn = await amp.connect(rabbitmqSettings);
console.log("Connection Created...");
const channel = await conn.createChannel();
console.log("Channel Created...");
let res = await channel.assertQueue(queue);
console.log("Queue Created...");
//read the data from the serial port...
const Readline = serialPort.parsers.Readline;
const parser = new Readline();
port.pipe(parser);
port.on('open', function() {
console.log('port open...');
});
//create an empty object and fill it with the sensor name and the temp value...
parser.on('data', function(data) {
var tempValueObj = new Object();
tempValueObj.sensorName = "TMP36GZ";
tempValueObj.temperature = data.slice(0, -2);
//convert the object to JSON (requiered from the RabbitMQ broker)
channel.sendToQueue(queue, Buffer.from(JSON.stringify(tempValueObj)));
console.log(`Message sent to queue ${queue}`);
});
port.on('close', function() {
console.log('port closed');
});
port.on('error', function() {
console.log('something went wrong in serial communication');
});
} catch (error) {
console.log(`Error => ${error}`);
}
}
connect();
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