Extreme Messaging for the Internet of Things

Talk I gave at http://campjs.com in August 2013 with a brief overview of the MQTT protocol.

Transcript

1. Extreme Messaging for the Internet of Things Tuesday, 13 August 13
2. Who is this guy? Tuesday, 13 August 13
3. Things Tuesday, 13 August 13
4. Internet of Things • Physical Computing • Sensor networks • UX for your environment • More intuitive • More efficient Tuesday, 13 August 13
5. Technical Challenges • More devices == More Connections • Wireless... sucks • Channel doesn’t matter anymore • Use 5.4ghz if you can Tuesday, 13 August 13
6. MQTT • Lightweight Protocol • Uses TCP on port 1883 • fixed-length header is just 2 bytes • Uses Transport Layer Security (TLS) Tuesday, 13 August 13
7. MQTT Why? • Where the network is expensive, has low bandwidth or is unreliable • When run on an embedded device with limited processor or memory resources • Where you want a simple and lean protocol to carry small payloads Tuesday, 13 August 13
8. MQTT QOS • Three qualities of service for message delivery: • At most once • At least once • Exactly once Tuesday, 13 August 13
9. How to Publish • Topics • Like a mail box • example $devices/123/events Tuesday, 13 August 13
10. How To Subscribe • Like a mailing list • Subscriptions • Has a concept of wild cards • $device/#/events • $device/# Tuesday, 13 August 13
11. Why not just HTTP? • Large preamble • Keepalives? • Complex to parse • Can use a lot of memory, 4k headers buffer • No mechanism for reliable transmission of data unless you ws-* Tuesday, 13 August 13
12. Demo • Demo of MQTT using the MQTT OSX application Tuesday, 13 August 13
13. Questions? • Is there any examples of MQTT in production? • Facebook is running MQTT on 600M mobiles and tablets • Is there a simple stream NodeJS based API for MQTT? • Myself and Tim Oxley are working on it. Tuesday, 13 August 13
14. Links • http://mqtt.org/ • http://mosquitto.org/ • http://mcollina.github.com/ascoltatori/ • https://npmjs.org/package/mqtt • AMQP vs MQTT for telemetry aggregation • IBM Redbook on MQTT Tuesday, 13 August 13
15. Contact • On twitter @wolfeidau • On Github http://github.com/wolfeidau • On the web http://www.wolfe.id.au Tuesday, 13 August 13