Thanks. I'm still a little confused by how to change a property.
for example, after connecting to the server, if I do:

<getProperties device="Temma" version="1.7" name="CONNECTION"/>
it returns:
<setSwitchVector device="Temma" name="CONNECTION" state="Idle" timeout="60" timestamp="2018-10-04T19:12:47">
    <oneSwitch name="CONNECT">
Off
    </oneSwitch>
    <oneSwitch name="DISCONNECT">
On
    </oneSwitch>
</setSwitchVector>
Now if I wanna change, for example, the state from "Idle" to "OK", do I do:
<newSwitchVector device="Temma" name="CONNECTION"> <oneSwitch name="state">OK</oneSwitch> </newSwitchVector>
?
But the state properties does not change.

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