You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
68 lines
2.1 KiB
68 lines
2.1 KiB
4 years ago
|
//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();
|