Check for numeric value

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Hello community,

today I went into a new issue related to “the cube is busy” problem of the eq-3 MAX! system.

When this problem occurs, the temperatureSetpoint of the thermostats changes to undefined.
Every change of the temperatureSetpoint is written to another variable, that stores the current user defined temperature.

In this case undefined is stored and the heating is turned off (4,5°C)

Check for

is not "undefined" or is not "" 

doesn’t work.

How could I avoid this issue

when $max-thermostat.temperatureSetpoint changes 
    then $temp-store = $max-thermostat.temperatureSetpoint

I need something like

when $max-thermostat.temperatureSetpoint changes and isNumber($max-thermostat.temperatureSetpoint)
    then $temp-store = $max-thermostat.temperatureSetpoint

As there is not answer yet, I’ll show my workaround solution, that works for me:

when $max-thermostat.temperatureSetpoint changes and $max-thermostat.temperatureSetpoint > 4.5
    then $temp-store = $max-thermostat.temperatureSetpoint