[Q] USB/ Bluetooth development for special devices.

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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 send/receive raw data to/from them ?

I am hoping to use the ASUS stand alone USB adapter, a USB hub and a USB serial port adapter to interface to the radio. I'd put a link here to the device, but I'm a newb and newbs are prevented from linking in their first 10 posts.

Does anyone see a problem with doing this ?

How would a Bluetooth Serial adapter work instead ? From the OS point of view, which would be easier/better to use ?

Thanks

I'd also like to connect and use an external USB sound "card". What are the issues with doing that ?

Thanks