ng_l2cap_llpi.c fix.diff applied, ng_l2cap.ko rebuilt (kernel #1):
  === LLPI FIX: l2cap_con lie (expect SUPPRESSED) ===
  LP_CON_CFM (pos)    -> ok (connection accepted -> CON_OPEN)
  ECHO_RSP            -> NOT RECEIVED          <-- lie suppressed
  === LLPI FIX: l2cap_con con (expect still works) ===
  LP_CON_CFM (pos)    -> ok (connection accepted -> CON_OPEN)
  ECHO_RSP            -> received 17 bytes -- connection OPEN, echo works
  exit=0