Andreas has already implemented a computer interface for the ICOM CI-V protocol for his antenna tuner.
I have built a Bluetooth interface into my tuner so that you can control the tuner very conveniently via the ICOM IC-705.
I have installed a standard HC-05 module from AZ-Delivery as the Bluetooth module.
This is supplied with 5V= by a switching regulator. The module etc. is screwed directly onto the MC board as a small piggyback board. I've only connected +12VDC, GND and J7-Pin 1 to the TXD-Pin on the HC05 module.
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The connection from the IC-705 to the tuner is very easy to establish via the IC-705 menu. If the tuner is switched on before the IC-705, the connection is even established automatically - what more could you want?