249ms URB    34  vc control  0x40 0x0c 0x83 0x00 len     1 wrote 0x6c      dir:write type:vendor recipient:device req:non-std
      249ms URB    35  vc control  0xc0 0x0c 0x84 0x00 len     1 read  0x00      dir:read  type:vendor recipient:device req:non-std