'Sets the log level used for `logging` in the underlying ``telnetlib``.
Note that ``telnetlib`` can be very noisy thus using the level ``NONE``
can shutdown the messages generated by this library.
New in Robot Framework 2.8.7.'

def set_telnetlib_log_level(self, level):

    self._verify_connection()
    old = self._telnetlib_log_level
    self._set_telnetlib_log_level(level)
    return old
