How to distinguish between gateway device and peripheral device in MQTT communication

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1

I have a question about identifying gateway devices and peripheral devices in MQTT communication.

In the documentation,

・losant/my-gateway-id/state

・losant/my-peripheral-device/state

It says that the devices are identified by my-gateway-id and my-peripheral-device in the above topic, but could you tell me if there are any other ways to identify them?

2

Hi @Rei_Naraoka and welcome to the Losant Forums!

my-gateway-id and my-peripheral-device are just placeholders; what is actually in that spot is the ID of the device.

So, given a gateway device whose ID is 111122223333444455556666, it will publish state on the topic losant/111122223333444455556666/state.

You can also write an application workflow with a Device: State Trigger targeting one or more devices, and identifying information about the device that published a message on that topic - including its ID, name, and meta tags - will be on the initial payload.

Let us know if you have any more questions!

3

Thank you for your reply.
Am I correct in understanding that if you want to publish information about multiple peripheral devices at once, you should use the workflow function?

4

The Device State Node can only publish data about a single device in one invocation, but you may invoke that node multiple times in a single workflow run - such as within a Loop Node.

So yes, if you have telemetry data for multiple devices in hand in a workflow environment, that is how you would publish data for those devices.