*** For the blood pressure meter, pairing can be set but data transmission is unstable. The reason could be: The A&D medical device always forces one to use RFCOMM port/channel 1 for the connection; but the Android device will choose the next available channel.

* After the research efforts of many weeks, we have successfully built Bluetooth communication test programs: one is an Android native application; the other is based on PhoneGap (plugin on Android) framework.