$ lsusb -v | grep iSerial
Couldn't open device, some information will be missing
  iSerial                 3 Mer Debug telnet on port 23 on rndis0 192.168.2.15 - also running udhcpd
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing
  iSerial                 1
  iSerial                 0
  iSerial                 0
Couldn't open device, some information will be missing
  iSerial