Chapter 4. Interacting with Sensors in Java
In this chapter, we will write Java code to control sensors with MQTT messages. We will write code that will be able to run on different popular IoT platforms. We will:
- Understand the requirements to control sensors with MQTT
- Define the topics and commands to control sensors
- Install the Eclipse Paho Java Client
- Create a security helper class to establish a TLS secured connection
- Configure a TLS secured connection in Java
- Work with asynchronous notifications and callbacks in Java
- Subscribe to topics and understand notification events in Java
- Process commands that interact with sensors in Java
- Work with last will and testament in Java
- Publish messages with commands to target sensors
