The path you try to command to must be the command itself and also the payload has to look different.
Path:
POST https://localhost:8443/automation/api/v1.0/motion/axs/AxisX/cmd/power
Payload:
{"value":true,"type":"bool8"}
There is an how to use the REST API in the blog area. Please have a look there for further hints.
Also the documentation of the ctrlX Data Layer will be improved with the new release RM21.03 ( version 1.8).
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