wodoinco.js

// https://github.com/EmergingTechnologyAdvisors/node-serialport/blob/3.1.2/README.md
const { SerialPort } = require('serialport')
const { ReadlineParser } = require('@serialport/parser-readline')

/* Hardware:
 * /dev/ttyUSB1 for USB UART
 *
 * not working? See who's using it:
 *   sudo fuser /dev/ttyUSB1
 *
 * Try with screen
 *   screen /dev/ttyUSB1 2400
 */

 module.exports = function(comPortName) { 
	var self = {
		
	_comPortName: comPortName,
	_ready: false,
	port: undefined,
	listeners: [],

    receiveSerial: function(data) {
		console.log("WoDoInCo: received '" + data + "'")
//		data = data.replace(/(\r\n|\n|\r)/gm, "")
		var found = false
		var oListener = this.listeners.find(value => value.key == data)
		if (oListener) {
			oListener.callback(data)
		} else {
			console.log("no listener registered for '" + data + "'")
		}
	},
	
	send: async function(data) {
		await this.port.write(data + '\r\n');
		console.log("Wodoinco write: " + data)
		return "Wrote " + data
	},
	
	init: function() {
        this.port = new SerialPort({ path: this._comPortName,
            baudRate: 2400,
        })
		const parser = this.port.pipe(new ReadlineParser())		
		this.port.on('open', function (data) {
            console.log('WoDoInCo: Serial port "' + this._comPortName + '" opened')
			this._ready = true
        }.bind(this));
        this.port.on('error', function (error) {
           console.log('WoDoInCo: failed to open serial port ' + this._comPortName + ': ' + error)
		   this._ready = false
        }.bind(this));
        parser.on('data', this.receiveSerial.bind(this));
	},
	
	addListener: function(key, callback) {
		this.listeners.push({ key: key, callback: callback })
	}
	
}
    self.init()
    return self
}