Effect of M25/24 (pause/resume) when not 'Printing' or 'Paused'

EasyTarget

Hi,

Hopefully a simple question, but either my google skillz are failing, or nobody has asked before..

I'm working on a pause/resume button for RRF/Duet; it is based on an existing project that talks to my controller over the PanelDue port; and is aware of the printer state.

I want to extend it with a button that sends M25 when printing and M24 when paused, eg:

      // Button held down for timeout; send commands as appropriate;
      if (printerstatus == 'P') Serial.println(F("M25"));
      if (printerstatus == 'A') Serial.println(F("M24"));

Should M24 and M25 only be sent in those states? (f/w 2.03 and later)

Does a Pause received when running a macro or streaming an external job (Busy state, B) have any effect? Will it be buffered until the macro/job stream is complete or silently ignored?

Ie: If the printer is running the pause macro (state D); what happens if a Resume (M24) arrives?
will it be processed after the macro is complete?
will it be ignored?
can I safely assume it will not interrupt the macro?
and does a pause (M25) while resuming (R) behave the same way?

In normal circumstances I'd just go ahead and test this, and would enjoy doing so but I'm far from home, where my printer is far from operational.