Any MQTT Client can Subscribe and Publish to a Feed, but they can also just Subscribe or Publish depending on what your device needs to do.Īdafruit.io hosts an MQTT server, as do many other companies, and they work very well for testing out devices or creating global networks of devices. Publishing to a Feed is also allowed by the MQTT Client and the MQTT Broker will pass that published data along to any device that is Subscribed to that particular Feed.
MQTT Clients can Subscribe to a Feed on the MQTT Broker and will receive an update if the content of the Feed it is Subscribed to changes. For MQTT to work you need to have a computer running as an MQTT Broker and all other devices connect to that computer as an MQTT Client. MQTT is a kind of secure machine-to-machine message protocol that is made for the internet of things (IoT).
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