#telnet
  shows telnet options (sub-protocols) currently enabled
#telnet <option>
  shows status of specified telnet option
  options can be decimal numbers in range 1..254 or one of the following aliases:
    EOR, ECHO, NAWS, MTTS, MSDP, MSSP, MCCP, MCCP1, MCCP2, MSP, MXP, ATCP, GMCP, AYT, CHARSET
#telnet <option> on|off
  turns on/off specified telnet option
  for options turned on JMC will automatically respond to WILL/DO requests with DO/WILL responses
  for options turned off JMC will automatically respond to WILL/DO requests with DONT/WONT responses
#telnet debug [on|off]
  turns on/off or switches telnet debugging messages
  also messages from telnet should be enabled (#message telnet on)
