Failure response code.
Status code from the last failed Configure response
or Join response. Failed responses are those for
which the LE_CONFIGURE_RESPONSE / LE_JOIN_RESPONSE
frame contains a non-zero code, or fails to arrive
within a timeout period.
If none of this client's requests have failed, this
object has the value 'none'.
If the failed response contained a STATUS code that
is not defined in the LAN Emulation specification,
this object has the value 'undefinedError'.
The value 'timeout' is self-explanatory.
Other failure codes correspond to those defined in
the specification, although they may have different
numeric values.