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Reading a variable value via serial polling?

Hi there,

 

I have a project that has a variable (MP).  what I would like to do (and searching the forums hasn't given me the answer)

 

Is to be able to poll the player at a regular interval and read the value of MP.

 

When my media changes, it sets the variable to a new value - like video1 or slideshow1.  I need to then poll for that value from a control system.

 

So I would send:  XXXXX

and receive back:  video1 (or current value).

Any help on this process would be greatly appreciated!

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