title: How to access Android Heart Rate Sensor RAW DATA? (reflected light, not the heart beat)
body: <p>The android sdk on heart rate sensor only returns the calculated bpm which I have no interest.  </p>
  
  <p>I need to access to android heart rate sensor RAW data, e.g. in terms of intensity of reflected value would be great. (because basically heart rate sensor uses led and measures the reflectance over time)  </p>
  
  <p>If possible, access the the raw image collected by the whatever image sensor would be greater. thanks.  </p>
  
  <p>Related SO question:
  <a href="https://stackoverflow.com/questions/27308542/read-underlying-color-light-data-from-android-wear-heart-rate-sensor?rq=1">Read underlying color/light data from Android Wear heart rate sensor?</a></p>