aws-mqtt-gate

AWS Lambda function creating a getaway from HTTP(s) to MQTT

Initially aimed to route messages from Telegram messenger to a Telegram bot via the AWS IoT broker.
May be used as a "general purpose" getway from HTTP(s) to MQTT.

Use cases

• Telegram Bot running on a cheep OpenWRT router with poor GSM connection
• Server running behind NAT with slow Internet connection without real IP that listens to commands via MQTT

How it works

• API URL exposed via AWS API shall be registered as the Telegram "Webbhook" for your bot.
• On receiving a message, the Telegram sends the requests to the "webhook" that AWS routes to this Lambda function.
• This function:
  - checks identity (see "authorization")
  - takes the whole content of the request body as the payload for the MQTT message
  - publishes the payload to the AWS IoT broker under the topic specified in config.js

Authorization of requests

In addition to AWS built-in authorization options (may be difficult to use with external services) this script supports

• authorization by IP-address of the requesting host
• HMAC code in the request params or body
• User/password in the URL
  (refer to "authRules" section in config.js)

How to use

0. Prerequisites:
   - sign up to AWS Lambda, AWS API, AWS IoT
   - install node.js and npm (claudia.js and node-lambda.js may be helpful)
   - clone the repository
1. Setup HTTP(s) API, register a "thing" with AWS IoT (create and download certificates for the "thing")
2. Update config.js with your settings, upload certificate (if needed)
3. Deploy to AWS Lambda ('npm run-script deploy' may be helpful)
4. Test with 'npm run-script test-aws'

Tests

npm test

Licence

ISC
vadim.konstantinov@gmail.com