aws-mqtt-websockets

Implementation of a middeware to use AWS MQTT service through websockets. aiming esp8266 plataform

ChangeLog

0.1 - has known limitation and it was not extensively tested

Motivation

As we cannot use AWS MQTT service directlybecause of the lack of support for TLS 1.2, we need to use the websocket communication as a transport layer for MQTT through SSL (supported by esp8266)

This way we can change the state of your esp8266 devices in realtime, without using the AWS Restful API and busy-waiting inefficient approach.

Dependencies

Library	Link	Use
aws-sdk-arduino	https://github.com/svdgraaf/aws-sdk-arduino	aws signing functions
arduinoWebSockets	https://github.com/Links2004/arduinoWebSockets	websocket comm impl
Paho MQTT for Arduino	https://projects.eclipse.org/projects/technology.paho/downloads	mqtt comm impl
ByteBuffer*	https://github.com/siggiorn/arduino-buffered-serial	circular byte buffer

* You may need to delete BufferedSerial as it is not necessary and not compatible with esp8266 (I will probably implement my own version of this circular byte array)

Limitation

does not implemented reconnect functionality yet (it drops the connection after a couple minutes in idle)
it was not extensively tested (like stress test, with many messages. it was just simple tests, like subscribe and publich Qos0 and QoS1 messages)
may work in arduino without SSL and out of aws environment (but not tested yet, you need to turn off SSL and inform the path - you may find no use for it with arduino, as arduino does not have SSL support. It is better to use MQTT directy without a security layer)
a lot of TODO and FIX in the code - I think it is more important to share first ;-)

Usage

It is transparent. It is the same as the usage of Paho. There is just some changes in the connection step. See the example for details. Things you should edit in the example:

ssid and password to connect to wifi
domain/endpoint for your aws iot service
region of your aws iot service
aws user key **
aws user secret key