MQTT

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MQTT - A Protocol for Connecting IoT Devices

MQTT is a really simple protocol that connected devices can use to publish and receive messages. Messages have a topic and may contain an arbitrary payload. Devices never talk to each other directly. A MQTT brokers receives published messages and distributes them to subscribers by matching message topics with subscribed-to topics.

• Handshaking - a FSM (Finite State Machine) of the protocol
• most simple application (QoS 0)
• encoding and decoding
• more sophistication (QoS 1, 2), limits of the Arduino environment (like, conversational state)

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