Inquiry Regarding Protocol for Lightning to USB Camera Adapter

I am reaching out to inquire about the supported protocols for the Lightning to USB Camera Adapter.

I'm creating an app that will access an external device connected to an iPhone through a Lightning to USB Camera Adapter. According to the External Acessory framework documentation, I need to declare protocol strings for the external accessories in Info.plist.

Could you please provide me with detailed information regarding the protocols supported by the Lightning to USB Camera Adapter? Specifically, I would like to know the protocols that enable data transfer and interaction with connected devices.