✨ Add MQTT & Trigger Node (#1705)

* ✨ MQTT-Node

* ⚡ Small fix

* ⚡ Error when the publish method faile

* ⚡ Improvements

* ⚡ Improvements

* ⚡ Add Send Input Data parameter

* ⚡ Minor improvements

Co-authored-by: Jan Oberhauser <jan.oberhauser@gmail.com>

packages/nodes-base/nodes/MQTT/MqttTrigger.node.ts

@@ -13,14 +13,14 @@ import {
 import * as mqtt from 'mqtt';
 
 import {
-	IClientOptions,
+	IClientOptions, ISubscriptionMap,
 } from 'mqtt';
 
 export class MqttTrigger implements INodeType {
 	description: INodeTypeDescription = {
 		displayName: 'MQTT Trigger',
 		name: 'mqttTrigger',
-		icon: 'file:mqtt.png',
+		icon: 'file:mqtt.svg',
 		group: ['trigger'],
 		version: 1,
 		description: 'Listens to MQTT events',
@@ -43,7 +43,9 @@ export class MqttTrigger implements INodeType {
 				type: 'string',
 				default: '',
 				description: `Topics to subscribe to, multiple can be defined with comma.<br/>
-				wildcard characters are supported (+ - for single level and # - for multi level)`,
+				wildcard characters are supported (+ - for single level and # - for multi level)<br>
+				By default all subscription used QoS=0. To set a different QoS, write the QoS desired<br>
+				after the topic preceded by a colom. For Example: topicA:1,topicB:2`,
 			},
 			{
 				displayName: 'Options',
@@ -52,6 +54,13 @@ export class MqttTrigger implements INodeType {
 				placeholder: 'Add Option',
 				default: {},
 				options: [
+					{
+						displayName: 'JSON Parse Body',
+						name: 'jsonParseBody',
+						type: 'boolean',
+						default: false,
+						description: 'Try to parse the message to an object.',
+					},
 					{
 						displayName: 'Only Message',
 						name: 'onlyMessage',
@@ -59,13 +68,6 @@ export class MqttTrigger implements INodeType {
 						default: false,
 						description: 'Returns only the message property.',
 					},
-					{
-						displayName: 'JSON Parse Message',
-						name: 'jsonParseMessage',
-						type: 'boolean',
-						default: false,
-						description: 'Try to parse the message to an object.',
-					},
 				],
 			},
 		],
@@ -81,6 +83,13 @@ export class MqttTrigger implements INodeType {
 
 		const topics = (this.getNodeParameter('topics') as string).split(',');
 
+		const topicsQoS: IDataObject = {};
+
+		for (const data of topics) {
+			const [topic, qos] = data.split(':');
+			topicsQoS[topic] = (qos) ? { qos: parseInt(qos, 10) } : { qos: 0 };
+		}
+
 		const options = this.getNodeParameter('options') as IDataObject;
 
 		if (!topics) {
@@ -91,9 +100,13 @@ export class MqttTrigger implements INodeType {
 		const host = credentials.host as string;
 		const brokerUrl = `${protocol}://${host}`;
 		const port = credentials.port as number || 1883;
+		const clientId = credentials.clientId as string || `mqttjs_${Math.random().toString(16).substr(2, 8)}`;
+		const clean = credentials.clean as boolean;
 
 		const clientOptions: IClientOptions = {
 			port,
+			clean,
+			clientId,
 		};
 
 		if (credentials.username && credentials.password) {
@@ -108,20 +121,19 @@ export class MqttTrigger implements INodeType {
 		async function manualTriggerFunction() {
 			await new Promise((resolve, reject) => {
 				client.on('connect', () => {
-					client.subscribe(topics, (err, granted) => {
+					client.subscribe(topicsQoS as ISubscriptionMap, (err, granted) => {
 						if (err) {
 							reject(err);
 						}
 						client.on('message', (topic: string, message: Buffer | string) => { // tslint:disable-line:no-any
-
 							let result: IDataObject = {};
 
 							message = message.toString() as string;
 
-							if (options.jsonParseMessage) {
+							if (options.jsonParseBody) {
 								try {
 									message = JSON.parse(message.toString());
-								} catch (error) { }
+								} catch (err) { }
 							}
 
 							result.message = message;
@@ -129,10 +141,9 @@ export class MqttTrigger implements INodeType {
 
 							if (options.onlyMessage) {
 								//@ts-ignore
-								result = message;
+								result = [message as string];
 							}
-
-							self.emit([self.helpers.returnJsonArray([result])]);
+							self.emit([self.helpers.returnJsonArray(result)]);
 							resolve(true);
 						});
 					});
@@ -144,7 +155,9 @@ export class MqttTrigger implements INodeType {
 			});
 		}
 
-		manualTriggerFunction();
+		if (this.getMode() === 'trigger') {
+			manualTriggerFunction();
+		}
 
 		async function closeFunction() {
 			client.end();