[Q] USB/ Bluetooth development for special devices.

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http://forum.xda-developers.com – I just bought a TF700. I've never written a single line of code for an Android device. I've done some Linux development. I want to build an app to control a Zoom HDZ300 AM/FM radio. It can be controlled remotely by simple messages sent to its serial port, but apparently the sending device does need to handle flow control. The sound output is regular analog stereo. That will go into an amplifier, not my Android. Does the Android operating system (Ice Cream Sandwich or Jelly Bean) allow programmers direct access to the USB or Bluetooth stacks so that one can enumerate devices and (HowTos)