![]() Device 2 is subscribed to the same topic as device 1 is publishing in.For example Device 1 publishes on a topic.In a publish and subscribe system, a device can publish a message on a topic, or it can be subscribed to a particular topic to receive messages. The first concept is the publish and subscribe system. MQTT allows you to send commands to control outputs, read and publish data from sensor nodes and much more. So, it’s the perfect solution for Internet of Things applications. MQTT is a simple messaging protocol, designed for constrained devices with low-bandwidth.
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