feat: add code

.editorconfig

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+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+indent_style = tab
+charset = utf-8
+
+[{package.json,*.yml}]
+indent_style = space
+indent_size = 2

.eslintignore

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+node_modules
+coverage
+dist

.eslintrc.json

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+{
+	"env": {
+		"node": true,
+		"es6": true
+	},
+	"parserOptions": {
+		"ecmaVersion": 2018,
+		"sourceType": "script"
+	},
+	"extends": [
+		"@csimi/eslint-config"
+	],
+	"rules": {
+		"no-bitwise": "off"
+	}
+}

.github/workflows/nodejs.yml

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+name: build
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [8.x, 10.x, 12.x]
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - name: npm install, build, and test
+      run: |
+        npm install
+        npm run build --if-present
+        npm test
+      env:
+        CI: true

.gitignore

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+node_modules
+npm-debug.log*
+coverage
+.nyc_output

.mocharc.json

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+{
+	"recursive": true,
+	"file": ["test/setup.js"]
+}

.nycrc.json

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+{
+	"all": true,
+	"produce-source-map": true,
+	"include": [
+		"lib/**"
+	]
+}

index.js

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+const { EventEmitter } = require('events');
+const { inherits } = require('util');
+const nanoMQTT = require('./lib');
+
+inherits(nanoMQTT, EventEmitter);
+
+function nanoEmitterMQTT (...args) {
+	const nano = new nanoMQTT(...args);
+	EventEmitter.call(nano);
+	return nano;
+}
+
+module.exports = nanoEmitterMQTT;

lib/.eslintrc.json

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+{
+	"env": {
+		"es6": false
+	},
+	"parserOptions": {
+		"ecmaVersion": 5
+	},
+	"rules": {
+		"no-var": "off",
+		"prefer-arrow-callback": "off"
+	}
+}

lib/adapter/espruino-tcp.js

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+/* global E */
+
+var net = require('net');
+
+function createConnection (nano, address, port) {
+	var connection = net.connect({
+		'host': address,
+		'port': port,
+	}, nano.connect.bind(nano));
+
+	var parse = function (message) {
+		var data = E.toUint8Array(message);
+		nano.parse(data);
+	};
+	var write = function (data) {
+		var message = E.toString(data);
+		connection.write(message);
+	};
+
+	connection.on('data', parse);
+	nano.on('data', write);
+
+	connection.on('end', function onClose () {
+		connection.removeListener('data', parse);
+		nano.removeListener('data', write);
+	});
+
+	return connection;
+}
+
+module.exports = function espruinoTcpAdapter (nano, address, port, timeout, retry) {
+	function setupConnection () {
+		try {
+			var connection = createConnection(nano, address, port);
+
+			var closeConnection = connection.end.bind(connection);
+			var removeTimeout = clearTimeout.bind(void 0, setTimeout(closeConnection, timeout || 10000));
+
+			nano.on('connected', removeTimeout);
+			connection.on('end', function onConnectionClosed () {
+				nano.removeListener('connected', removeTimeout);
+				nano.setConnected(false);
+				setTimeout(setupConnection, retry || 5000);
+			});
+		}
+		catch (err) {
+			setTimeout(setupConnection, retry || 5000);
+		}
+	}
+
+	setupConnection();
+
+	return nano;
+};

lib/adapter/espruino-udp.js

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+/* global E */
+
+var dgram = require('dgram');
+
+module.exports = function espruinoUdpAdapter (nano, address, port, isBroadcast) {
+	var server = dgram.createSocket('udp4');
+	server.bind(function onBound () {
+		server.setBroadcast(Boolean(isBroadcast));
+	});
+
+	server.on('message', function onMessage (message) {
+		var data = E.toUint8Array(message);
+		nano.parse(data);
+	});
+	nano.on('data', function onData (data) {
+		var message = E.toString(data);
+		server.send(message, 0, message.length, port, address);
+	});
+
+	if (isBroadcast) {
+		setTimeout(nano.setConnected.bind(nano, true), 0);
+	}
+	else {
+		setTimeout(nano.connect.bind(nano));
+	}
+
+	return nano;
+};

lib/index.js

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+/* global Uint8Array */
+
+var FCC = String.fromCharCode;
+
+function createField (value) {
+	return FCC(value.length >> 8, value.length & 255) + value;
+}
+
+function createPacket (cmd, variable, payload) {
+	var value = variable + payload;
+	var length = value.length;
+
+	var buf = new Uint8Array(2 + length);
+
+	buf[0] = cmd;
+	buf[1] = length;
+
+	for (var i = 0; i < length; i++) {
+		buf[i + 2] = value.charCodeAt(i);
+	}
+
+	return buf;
+}
+
+function nano (uid) {
+	this.uid = uid;
+	this.isConnected = false;
+}
+
+nano.prototype.CONNECT = 1 << 4;
+nano.prototype.CONNACK = 2 << 4;
+nano.prototype.PUBLISH = 3 << 4;
+nano.prototype.SUBSCRIBE = 8 << 4;
+nano.prototype.PINGREQ = 12 << 4;
+nano.prototype.DISCONNECT = 14 << 4;
+
+nano.prototype.setConnected = function setConnected (isConnected) {
+	this.isConnected = isConnected;
+	this.emit(isConnected ? 'connected' : 'disconnected');
+};
+
+nano.prototype.connect = function connect () {
+	this.emit('data', createPacket(
+		nano.prototype.CONNECT,
+		createField('MQTT') + FCC(
+			4,
+			0,
+			0,
+			0
+		),
+		createField(this.uid)
+	), nano.prototype.CONNECT);
+};
+
+nano.prototype.disconnect = function disconnect () {
+	this.emit('data', createPacket(
+		nano.prototype.DISCONNECT,
+		'',
+		''
+	), nano.prototype.DISCONNECT);
+};
+
+nano.prototype.publish = function publish (topic, message, retain) {
+	var flags = retain ? 1 : 0;
+	this.emit('data', createPacket(
+		nano.prototype.PUBLISH | flags,
+		createField(topic),
+		message
+	), nano.prototype.PUBLISH);
+};
+
+nano.prototype.subscribe = function subscribe (topic) {
+	this.emit('data', createPacket(
+		nano.prototype.SUBSCRIBE | 2,
+		FCC(1 << 8, 1 & 255),
+		createField(topic) + FCC(0)
+	), nano.prototype.SUBSCRIBE);
+};
+
+nano.prototype.parse = function parse (data) {
+	var cmd = data[0];
+	var message = data.toString();
+	if (cmd === nano.prototype.CONNACK) {
+		this.setConnected(true);
+		return [nano.prototype.CONNACK];
+	}
+	else if (cmd === nano.prototype.PUBLISH) {
+		var index = 4 + ((data[2] << 8) | data[3]);
+		var topic = message.slice(4, index);
+		var payload = message.slice(index);
+
+		this.emit('message', topic, payload);
+		return [nano.prototype.PUBLISH, topic, payload];
+	}
+	else if (cmd === nano.prototype.PINGREQ) {
+		this.emit('ping');
+		return [nano.prototype.PINGREQ];
+	}
+	else {
+		this.emit('error', data);
+	}
+
+	return [];
+};
+
+module.exports = nano;

license

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+Copyright (c) 2019, David Csirmaz
+
+Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.