3rd-Gen iPad Pro has USB-C connector.
I want to access USB device by PTP/MTP protocol through USB-C wired connection.
If you know any Framework or API to realize it, please let me know.
I couldn't find it in Apple Developer Documentation.
https://developer.apple.com/documentation/
Thank you.
Is that device discussed here?
https://support.apple.com/en-us/HT209186
In the case of a camera, as an example, the Photos app may be able to access images on it, but I don't believe there is an API that would allow your app the same freedom.
See h ttps://9to5mac.com/2018/11/07/ipad-pro-usb-c-accessories/
The easiest method I've found to interface an iPad with a generic USB peripheral (not listed in HT209186) is via a Raspberry Pi. I plug the USB device into the Pi, run a server that talks to the appropriate USB driver and serves the data from the peripheral using a network connection to the iOS device. (I currently have an app that uses just that method to connect to USB RTL-SDR radios.)
A wired connection for higher-bandwidth or security is possible via:
iPad Pro -> USB-C-to-Ethernet-dongle -> Pi -> USB peripheral.
Or:
iPad Mini -> Lightning-Camera-Connection-kit -> powered-USB-hub-> USB-to-Ethernet-dongle -> PI -> USB thingy.
