Marcus Roskosch has developed a rig control app for the iPhone. It enables full control of the ICOM IC-705, IC-7610, IC-9700, and the IC-R8600. Sadly it does not support the IC-7300 who's computer interface is restricted to USB. I have SDR-Control which I can use with My Mac Studio but thanks to the USB interface it does not work nearly as well as the Ethernet connection the above listed radios have.
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SDR-Control mobile - Marcus & Jan Roskosch
roskosch.de