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Slide 1: Setting up an IoT |
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The Network Layers |
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< | The WeMos D1 mini has a built-in WiFi interface
In order to communicate with other IoT nodes we must therefore connect to the WiFi network first
On top of WiFi we will run a TCP session
On top of TCP we will run the MQTT protocol
On top of MQTT we have dedicated topics and payloads imposed by Cayenne |
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> | The WeMos D1 mini has a built-in WiFi interface
In order to communicate with other IoT nodes we must therefore
connect to the WiFi network first
On top of WiFi we will run a TCP session
On top of TCP we will run the MQTT protocol
On top of MQTT we have dedicated topics and payloads imposed by Cayenne |
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Accessing the WiFi network |
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> | Sending dummy temperature data
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> | Receiving commands
Receiving commands is a bit more tricky! We must:
- Write a callback function and register it with the MQTT client
- This function takes 2 arguments:
- The topic
- The payload
- Subscribe to the topic
- Wait forever. The callback function will be executed when a message with the
topic we subscribed to, will arrive
Subscribe a callback
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