The ‘Call a Service’ text uses the preposition ‘on’ to refer to a target, but this could be confused with ‘on/off’. Would it be better to change ‘on’ to ‘to’?
It’s a minor point, but the following example shows how the word ‘on’ is immediately followed by ‘off’, which can be misread at a glance.
Now:
Call a service ‘Switch: Turn off’ on switch.your_switch_device
Suggested:
Call a service ‘Switch: Turn off’ to switch.your_switch_device