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=What does this example shows? How it works?=

=What does this example shows? How it works?=

The server we use here is ThingSpeak which has an intuitive chart to show the test result for our test.The ThingSpeak IoT service now supports MQTT subscriptions to receive instant updates when a ThingSpeak channel gets updated. The method here is general and can be used with other IoT servers for MQTT connection as well.  

The server we use here is ThingSpeak which has an intuitive chart to show the test result for our test.The ThingSpeak IoT service now supports MQTT subscriptions to receive instant updates when a [https://thingspeak.com/ ThingSpeak]

channel gets updated. The method here is general and can be used with other IoT servers for MQTT connection as well.  

[[File:MQTT_1.png|400px|none|thumb|Message Queuing Telemetry Transport]]

[[File:MQTT_1.png|400px|none|thumb|Message Queuing Telemetry Transport]]

[[File:yuanliMQTT.png|400px|none|thumb|working principle]]

[[File:yuanliMQTT.png|400px|none|thumb|working principle]]

The payload, which can be understood as the content of the message, refers to the specific content to be used by the subscribers.

The payload, which can be understood as the content of the message, refers to the specific content to be used by the subscribers.