Android Bluetooth

I have a unity program which I need to be able to access bluetooth when running on an android.

I am controlling a robot using an Android phone, the android should send commands to the robot via bluetooth and it implements the commands. I have it working fine with a direct serial connection (wired) through a com port, but once I try to use the bluetooth I get stuck as the bluetooth creates a software com and not a physical one.

How do I access the software com port on android from within Unity? Or should I be trying to access the bluetooth in some other fashion? - Believe me I have searched for hours for an answer to this and I know posting here is a longshot. Please don't do a quick search of the forum and post a link to some random post which I have certainly already read.

I welcome other ideas on how to make this work.