In using 'Get MQTT topic value' feedback into a local variable' how to set trigger on this variable change?

[Nodi-Rubrum]

In using 'Get MQTT topic value' feedback into a local variable' how to set trigger on this variable change? As I understand it, mqtt message must 'now' be set to a local variable... OK... then how to trigger a button press/release on that local variable value? Using the old feedback methods for MQTT... you could just set a custom global variable, and then of course a trigger on value to trigger button press/release, however, that method is depreciated? Or will be at some point? Per the documentation?

[Nodi-Rubrum]

Really? No one?

[Julusian]

If a trigger can't react to the change of a local variable it owns, that sounds like a feature request to address that.

Or its not pretty, but you can get that feedback into a global variable through an expression variable. It is a bit tedious as you will need to add the local variable and set the expression to reference that variable, but would work.

An earlier iteration of expression variables was to allow any feedback type to be chosen, but it was deemed too confusing/complex to handle all the different cases in a good UX