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@ -27,7 +27,7 @@ In this lesson we'll cover:
## Communication protocols
There are a number of popular communication protocols used by IoT devices to communicate with the Internet. The most popular are based around publish/subscribe messaging via some kind of broker. The IoT devices connect to the broker and publish telemetry and subscribe to commands, the cloud services also connect to the broker and subscribe to all the telemetry messages and publishe commands either to specific devices, or to groups of devices.
There are a number of popular communication protocols used by IoT devices to communicate with the Internet. The most popular are based around publish/subscribe messaging via some kind of broker. The IoT devices connect to the broker and publish telemetry and subscribe to commands, the cloud services also connect to the broker and subscribe to all the telemetry messages and publish commands either to specific devices, or to groups of devices.
![IoT devices connect to a broker and publish telemetry and subscribe to commands. Cloud services connect to the broker and subscribe to all telemetry and send commands to specific devices.](../../../images/pub-sub.png)

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