Creating #IOT applications using #MQTT
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The document outlines the use of MQTT, a 1:many message protocol, for IoT devices to facilitate communication for logging, analytics, and command control. It emphasizes the importance of efficient memory and time management in IoT applications, suggesting a connection creation model that avoids dynamic allocation. A simple example of a blinking LED on a Raspberry Pi is provided to illustrate publishing output states via MQTT.
Creating #IOT applications using #MQTT
- 1. ©2015, J.R. Cohen Jeffrey R. Cohen, P.E.
- 2. ©2015, J.R. Cohen IOT Devices and Applications Need to Send Information to Other Computers For Logging and Analytics User Interface Command and Control IOT Devices and Apps May Need to Receive Be Careful! Safety Concerns Here MQTT is 1:Many Message Protocol Publisher/Subscriber model Sender Doesn’t Need to Know Receivers Open Source Libraries Make the Job Quick I used Paho (https://eclipse.org/paho/)
- 3. ©2015, J.R. Cohen For non-IOT, Memory and Time are Cheap, so 1.Create the Connection 2.Publish the Message 3.Close the Connection BUT for IOT, Memory and Time May Be Important ** No Dynamic Allocation ** 1.Create Connection at Startup 2.Publish Messages During Normal Operation 3.Close Connection at Shutdown
- 4. ©2015, J.R. Cohen Simple Blinking LED on Raspberry PI that Publishes the state of the Output via MQTT
- 5. ©2015, J.R. Cohen Notice States Startup Normal Operation Shutdown
- 6. ©2015, J.R. Cohen Not the final versions, Simplified to show you what to do.
- 7. ©2015, J.R. Cohen Twitter: CohenJeffrey LinkedIn: https://www.linkedin.com/in/JeffreyRCohen