call_action vs variable_set?

Developer's Corner Scene Scripting
#1

Do they perform the same task or is there a difference?

Example:
luup.variable_set (“urn:upnp-org:serviceId:SwitchPower1”,“Heater”, “1”, 91)
Vs.
luup.call_action (“urn:upnp-org:serviceId:SwitchPower1”,“SetTarget”,{ newTargetValue=“1” },91)

JOD.

#2

IIUC, you’re asking about the difference between

[tt]luup.call_action(“urn:upnp-org:serviceId:SwitchPower1”, “SetTarget”, { newTargetValue=“1” }, 16879 )[/tt]

and

[tt]luup.variable_set(“urn:upnp-org:serviceId:SwitchPower1”, “Target”, “1”, 16879 )[/tt].

The first line does change the state of the physical device #16879, the second line changes the UPnP variable ‘Target’ without modifying the state of the physical device.

#3

Thanks @Ap15e, you understood correctly.

I was stuck in my thinking that luup.variable_get obtained the state, therefore luup.variable_set would change the state. But could not understand why call_action worked for me and variable_set didn’t.

Makes sense now.

JOD.