File "trezorlib/client.py", line 140, in cancel
  File "trezorlib/client.py", line 149, in _raw_write
  File "trezorlib/transport/bridge.py", line 164, in write
  File "trezorlib/transport/bridge.py", line 68, in write_buf
  File "trezorlib/transport/bridge.py", line 132, in _call
  File "trezorlib/transport/bridge.py", line 45, in call_bridge