https://github.com/jimmyn/aws-mqtt-client

AWS Websocket Pub/Sub client
https://github.com/jimmyn/aws-mqtt-client

aws aws-iot aws-mqtt aws-websockets mqtt websockets

Last synced: 2 days ago
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AWS Websocket Pub/Sub client

• Host: GitHub
• URL: https://github.com/jimmyn/aws-mqtt-client
• Owner: jimmyn
• License: other
• Created: 2016-07-11T13:53:23.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2023-03-04T07:02:43.000Z (almost 2 years ago)
• Last Synced: 2024-12-16T21:11:43.178Z (9 days ago)
• Topics: aws, aws-iot, aws-mqtt, aws-websockets, mqtt, websockets
• Language: JavaScript
• Homepage:
• Size: 265 KB
• Stars: 155
• Watchers: 6
• Forks: 17
• Open Issues: 6
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# AWS Websocket Pub/Sub client

[AWS MQTT](http://docs.aws.amazon.com/iot/latest/developerguide/protocols.html) Websocket Pub/Sub with AWS IoT based on [MQTT.js](https://github.com/mqttjs/MQTT.js).

Recently [AWS released support of WebSockets for IoT](https://aws.amazon.com/about-aws/whats-new/2016/01/aws-iot-now-supports-websockets-custom-keepalive-intervals-and-enhanced-console/) service. It is very easy to use as Pub/Sub message system for serverless web applications. You can post new messages from `AWS lambda function` via `http post request` and receive them as websocket messages on client.

## Installing it

````bash

npm i aws-mqtt-client --save

````

## Basic usage

1.  Create an IAM role and asign predefined `AWSIoTDataAccess` policy. (It is better to use [AWS Cognito](https://aws.amazon.com/cognito/) to provide temporary credentials for the front-end application, you can also customize policy to allow access only to user specific topics).

2.  Run AWS CLI command `aws iot describe-endpoint` to get IoT endpoint url.

3.  Create `mqttClient` with AWS credentials.

````js

import AWSMqtt from "aws-mqtt-client";

const mqttClient = new AWSMqtt({

  accessKeyId: AWS_ACCESS_KEY,

  secretAccessKey: AWS_SECRET_ACCESS_KEY,

  sessionToken: AWS_SESSION_TOKEN,

  endpointAddress: AWS_IOT_ENDPOINT_HOST,

  region: "us-east-1"

});

````

4.  Connect and receive messages from your topic.

````js

mqttClient.on("connect", () => {

  mqttClient.subscribe("test-topic");

  console.log("connected to iot mqtt websocket");

});

mqttClient.on("message", (topic, message) => {

  console.log(message.toString());

});

````

5.  Publish a message.

````js

mqttClient.publish(MQTT_TOPIC, message);

````

### Complete [MQTT.js API](https://github.com/mqttjs/MQTT.js#api)

## Credits

Based on [Serverless JS-Webapp Pub/Sub with AWS IoT](http://stesie.github.io/2016/04/aws-iot-pubsub) article by [Stefan Siegl](https://github.com/stesie). This library is a wrapper around [MQTT.js](https://github.com/mqttjs/MQTT.js) npm package.