xcode - How to send message to virtual port in iOS -

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i'm starting project need control external device using ipad.

my device connected via usb, , far know, ipad should detect virtual port, i'm having problems in finding how can make ipad app send messages device.

the first part of project consist on sending messages, later i'll receiving external devices, knowing how communicate virtual port think can go on.

so, questions are:

1) ipad communicate external devices connected via usb virtual ports?

2) how can send messages them?

thanks

to connect via usb (over lightning connector) you'll need join mfi program.


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