mbed-js-st-mqtt

mbed-js-mqtt

MQTT library for Javascript for Mbed OS.

About library

Helper class providing functions for MQTT library in JavaScript.

Requirements

This library is to be used with the following tools:

• Mbed
• JerryScript

See this project for more information: mbed-js-x-nucleo-iks01a2-mqtt-example

Installation

• Before installing this library, make sure you have a working JavaScript on Mbed project and the project builds for your target device. Follow mbed-js-x-nucleo-iks01a2-mqtt-example to create the project and learn more about using JavaScript on Mbed.

• Install this library using npm (Node package manager) with the following command:

cd project_path
npm install syed-zeeshan/mbed-js-mqtt

Usage

// Instantiate HTS221 library 
var mqtt = new MQTT_JS();

// Initialize MQTT
mqtt.init(str_id, str_password, str_url, str_port);

// Subscribe to MQTT broker
mqtt.subscribe(str_topic);

// Set Subscription callback
mqtt.onSubscribe(fn_callback);

// Connect to MQTT broker
mqtt.connect();

// Publish data to MQTT broker
mqtt.publish(str_data);

// Yield data from MQTT broker
mqtt.yield(int_time);

Example

// Instantiate HTS221 library 
var mqtt = new MQTT_JS();

// Initialize MQTT
mqtt.init('id', 'password', 'url', 'port');

// Subscribe to MQTT broker
mqtt.subscribe('topic');

// Set Subscription callback
mqtt.onSubscribefunction(data) {
    print('MQTT callback result: ' + data);
});

// Connect to MQTT broker
mqtt.connect();

// Publish data to MQTT broker
var data = {
  'key': 'value'
};
if(mqtt.publish(JSON.stringify(data)) == 0){
    print('Published successfully!');
}
else{
    print('Publishing failed!');
}

// Yield data from MQTT broker
mqtt.yield(500); // Wait for 500ms