mqtt.cool-node-client

MQTT.Cool Node.js Client

Overview

The MQTT.Cool Web Client is a JavaScript library for the development of MQTT.Cool clients running on the Node.js runtime.

The library enables JavaScript applications to act as an MQTT client; that is, ready to send and receive real-time MQTT messages to/from any MQTT broker connected to the MQTT.Cool server.

Installation

The library is available as npm package, so you can download and install it through:

npm install mqtt.cool-node-client

Development

Access the module

const mqttcool = require("mqtt.cool-node-client");

Open a session against the MQTT.Cool server, create an MQTT client and connect to the MQTT broker

mqttcool.openSession('http://my.MQTT.Cool.server:8080', 'my_user', 'my_password', {
  onConnectionSuccess: function(mqttCoolSession) {
    var client = mqttCoolSession.createClient('my_mqtt_broker', 'my_client_id');
    client.connect({
      onSuccess: function() {
        console.log("Connected!");
      }
    });
    ...
  }
});

Request a Subscription:

client.subscribe("my/cool/topic");

Listen for messages:

client.onMessageArrived = function(message) {
  console.log("onMessageArrived:" + message.payloadString);
}

Publish a Message to the server:

message = new mqttcool.Message("My Message!");
message.destinationName = "my/cool/topic";
client.send(message)

Compatibility

• Compatible with MQTT.Cool since version 1.2.0.
• Based on Lightstreamer SDK for Node.js Clients version 7.2.4 build 1757.
• Compatible with code developed with the previous version.

Changelog

See detailed changes on https://mqtt.cool/download/changelog/?component=nodejs&version=1.2.1

Documentation

• API Reference
• Chapter "Client Application Development" of Getting Started Guide

For further details, visit the SDK section on the MQTT.Cool site.