[Q] "Hacking" Resmed S+ topic

Hi all!

I am new to this forum (first time asking questions!) but always get here to get solutions!
Right now I am trying to develop an app to detect breathing using a device called "Resmed S+", which is a non-contact device that can track your sleep and breathing (sounds cool!).
However, it does not have any SDK/API available to get the data, and it seems pretty hard to get data using bluetooth...
My question is if anyone has "hacked" the device, if yes, then I would be very thankful if you could give me some instructions. Otherwise, any recommendation/advise is appreciated.

Thanks a lot!
Chang