○─ Polling 1 times for unidentified transfer on endpoint 7.1 IN
  ├─── IN transaction on 7.1, NAK
  │    ├── IN packet on 7.1, CRC 1B
  │    └── NAK packet
○─┼─ 1 invalid groups
└─┼─── 1 malformed packet
  │    └── Malformed packet (possibly IN, but bad CRC) of 3 bytes: [69, B7, DB]
○─┼─ 1 invalid groups
└─┼─── 1 malformed packet
  │    └── Malformed packet (possibly IN, but bad CRC) of 3 bytes: [69, B7, DB]
○─┼─ 1 invalid groups
└─┼─── 1 malformed packet
  │    └── Malformed packet (possibly SOF, but bad CRC) of 3 bytes: [A5, BB, CE]