node-red-contrib-lorawan/lib/test.js

Node-RED module for the LoRaWAN RN2483 and RN2903 radio modules

const SerialPort = require('serialport');
const ASync = require('async');
const Delimiter = require('@serialport/parser-delimiter');
//var RN2483 = require('./commands.js');

const port = new SerialPort('/dev/ttyAMA0', {
		baudRate: 57600,
		dataBits: 8,
		stopBits: 1,
		parity: 'none',
		rtscts: false,
	});

port.on('error', function (err) {
	console.log('Error: ', err.message)
});

// Pipe the data into another stream (like a parser or standard out)
const parser = port.pipe(new Delimiter({
			delimiter: '\r\n'
		}));
parser.on('data', receive);

function sendCommand(cmd, ...args) {
	transmit(cmd);
}

function receive(data) {
	if (callbackStack.length > 0) {
		console.log(callbackStack);
		var item = callbackStack.pop();
		var cmd = item.data;
		var callback = item.callback;
		console.log('Answer to "' + cmd + '": ' + data.toString('ascii'));
		callback(null, data);
	};
}

function transmit(data, callback) {
	console.log("Send command " + data);
	port.write(data + "\r\n", function (err, res) {
		if (err) {
			// I'm assuming that if there is an error on the line
			// you won't receive serial data for the request. Hence
			// we remove the callback from the stack.
			callbackStack.splice(callbackStack.indexOf({
					data,
					callback
				}), 1);
			callback(err);
		};
	});
	callbackStack.unshift({
		data,
		callback
	});
}

var callbackStack = [];

var init_sequence_p2p = [
	'mac pause',
	'radio set pwr ' + '15',
	'radio set freq ' + '868100000',
	'radio set sf ' + 'sf12',
	'radio set cr ' + '4/5',
	'radio set bw ' + '125',
	'radio set crc ' + 'on'
];

function init() {
	var async = require('async');
	var cmds_sequence = init_sequence_p2p
		console.log(cmds_sequence);
	async.eachSeries(cmds_sequence, function (item, next) {
		transmit(item, function (err, data) {
			if (data == 'invalid_param')
				return;
			if ((data == "4294967245") || (data == "ok"))
				next();
		})
	},
		function (err) {
		if (err == null)
			console.log('Initialisation OK !');
		else
			console.log('Error on initialization: ' + err);
	});
}

init();