What is the role of MQTT in IoT, and how can it be used in Java applications?
MQTT is used for sending data over the internet in IoT systems, and Java is used to handle the database connections for the received messages.
Thatâ€™s partially correct. While MQTT is used for communication, Java also directly handles message publishing/subscribing, not just database connections.
Can you explain the process of subscribing and publishing messages in Java using MQTT?