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As referred to document “Accessory Interface Specification Release R37”  section 39.3.2 “EA Native Transport (USB Host Mode) Example”, apple device (host) should send SET_INTERFACE command after MFI-authentication and identification is successful for establishing/starting EA Native session with accessory. Our assumption is that StartExternalAccessoryProtocolSession message is not expected to be received from apple device for EA Native communication. Could you confirm? Is there any way to monitor EA Native packet communication from apple device? We have used ATS tool to monitor USB traffic, but it seems there no support to capture External Accessory Native Transport (USB Host Mode) data.