○── Polling 4 times for interrupt transfer on endpoint 14.1 IN
  ├──── Starting IN transaction on 14.1
  │     ├── SPLIT packet starting low speed interrupt transaction on hub 12 port 2
  │     └── IN packet on 14.1, CRC 0A
  ├──── Completing IN transaction on 14.1, NAK
  │     ├── SPLIT packet completing low speed interrupt transaction on hub 12 port 2
  │     ├── IN packet on 14.1, CRC 0A
  │     └── NAK packet
  ├──── Starting IN transaction on 14.1
  │     ├── SPLIT packet starting low speed interrupt transaction on hub 12 port 2
  │     └── IN packet on 14.1, CRC 0A
  ├──── Completing IN transaction on 14.1, NAK
  │     ├── SPLIT packet completing low speed interrupt transaction on hub 12 port 2
  │     ├── IN packet on 14.1, CRC 0A
  │     └── NAK packet
  ├──── Starting IN transaction on 14.1
  │     ├── SPLIT packet starting low speed interrupt transaction on hub 12 port 2
  │     └── IN packet on 14.1, CRC 0A
  ├──── Completing IN transaction on 14.1, NAK
  │     ├── SPLIT packet completing low speed interrupt transaction on hub 12 port 2
  │     ├── IN packet on 14.1, CRC 0A
  │     └── NAK packet
  ├──── Starting IN transaction on 14.1
  │     ├── SPLIT packet starting low speed interrupt transaction on hub 12 port 2
  │     └── IN packet on 14.1, CRC 0A
  ├──── Completing IN transaction on 14.1, NAK
  │     ├── SPLIT packet completing low speed interrupt transaction on hub 12 port 2
  │     ├── IN packet on 14.1, CRC 0A
  │     └── NAK packet
  │○─ Polling 4 times for interrupt transfer on endpoint 14.2 IN
  │├─── Starting IN transaction on 14.2
  ││    ├── SPLIT packet starting low speed interrupt transaction on hub 12 port 2
  ││    └── IN packet on 14.2, CRC 19
  │├─── Completing IN transaction on 14.2, NAK
  ││    ├── SPLIT packet completing low speed interrupt transaction on hub 12 port 2
  ││    ├── IN packet on 14.2, CRC 19
  ││    └── NAK packet
  │├─── Starting IN transaction on 14.2
  ││    ├── SPLIT packet starting low speed interrupt transaction on hub 12 port 2
  ││    └── IN packet on 14.2, CRC 19
  │├─── Completing IN transaction on 14.2, NAK
  ││    ├── SPLIT packet completing low speed interrupt transaction on hub 12 port 2
  ││    ├── IN packet on 14.2, CRC 19
  ││    └── NAK packet
  │├─── Starting IN transaction on 14.2
  ││    ├── SPLIT packet starting low speed interrupt transaction on hub 12 port 2
  ││    └── IN packet on 14.2, CRC 19
  │├─── Completing IN transaction on 14.2, NAK
  ││    ├── SPLIT packet completing low speed interrupt transaction on hub 12 port 2
  ││    ├── IN packet on 14.2, CRC 19
  ││    └── NAK packet
  │├─── Starting IN transaction on 14.2
  ││    ├── SPLIT packet starting low speed interrupt transaction on hub 12 port 2
  ││    └── IN packet on 14.2, CRC 19
  │└─── Completing IN transaction on 14.2, NAK
  │     ├── SPLIT packet completing low speed interrupt transaction on hub 12 port 2
  │     ├── IN packet on 14.2, CRC 19
  │     └── NAK packet