In the previous chapter, you learned how to create an actuator app that runs on the Raspberry Pi. You also learned how to do basic I/O directly using your Raspberry Pi.
In this chapter, we'll start publishing data we collect on the internet. The first protocol we'll study is the MQTT protocol. This chapter covers:
- An introduction to the MQTT protocol
- The Publish/Subscribe communication pattern
- Connecting to a broker
- Publishing information
- Subscribing to information
- Testing and troubleshooting communication
- Basic security considerations
