Pi Play
MQTT messaging controls multiple Pi music players from a smartphone.
Raspberry Pi peer-to-peer communications
Lead Image © sergwsq, 123RF.com
For Pi-to-Pi communication, you can choose among a number of different protocol options, and some excellent cross-platform messaging protocols meet simple data-passing requirements, including Advanced Message Queue Protocol (AMQP) [1], Constrained Application Protocol (CoAP) [2], Message Queuing Telemetry Transport (MQTT) [3], and Simple/Streaming Text-Oriented Messaging Protocol (STOMP) [4]. Moreover, some popular middleware solutions like RabbitMQ [5] layer on top of the messaging protocols and offer a generic interface with many added features.
For simple Pi data-passing projects, MQTT is something you should seriously consider. MQTT is a lightweight, well-documented solution that is easy to install. Many Internet of Things (IoT) options are available, and Arduino has a number of libraries that support MQTT.
MQTT comprises the following elements:
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