# MQTT

> MQTT is a machine-to-machine (M2M)/"Internet of Things" connectivity protocol. It was designed as an extremely lightweight publish/subscribe messaging transport.
>
> [http://mqtt.org/](http://mqtt.org/)

## MQTT Broker

* [Mosquitto](https://mosquitto.org/) (Open source & free)
* [HiveMQ](http://www.hivemq.com/) (Enterprise)

## MQTT Client for Android

* [https://eclipse.org/paho/clients/android/](https://eclipse.org/paho/clients/android/)

## References

* [https://www.pubnub.com/blog/2014-08-14-what-is-mqtt-use-cases/](https://www.pubnub.com/blog/2014-08-14-what-is-mqtt-use-cases/)
* [https://code.facebook.com/posts/820258981365363/building-mobile-first-infrastructure-for-messenger/](https://code.facebook.com/posts/820258981365363/building-mobile-first-infrastructure-for-messenger/)
* [https://www.facebook.com/notes/facebook-engineering/building-facebook-messenger/10150259350998920/](https://www.facebook.com/notes/facebook-engineering/building-facebook-messenger/10150259350998920/)
