For testing enable logging in server, then you see in log if temperature did go down since you also see temperature responses there. Code gets send on the fly and some g-code gets added to regular code depending on configuration, but normally no temperature command unless a user changes temperature manually.
Clogging is not necessarily if temperature drops. It also happens when it is too high and filament moves up inside nozzle to cool area and hardens there or if nozzle is not correctly assembled having spaces that should not be there by design when done correctly. And some have debris clogging the nozzle output physically.
