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ieee80211_bmiss(9)

The  software layer provides a support framework for drivers that
includes handling beacon miss events in  station  mode.   Drivers
can  dispatch  beacon miss events that are recognized in hardware
or can detect beacon miss if the driver dispatches received  bea‐
con frames through the normal receive path.  Software beacon miss
support is especially useful when multiple vaps are operating and
any hardware beacon miss support is not available (e.g. operating
as  an access point together with one or more station mode vaps).
Drivers should dispatch beacon miss events recognized in the dri‐
ver with This causes some number of  ProbeRequest  frames  to  be
sent  to  the  access  point to check if the association is still
alive.  If no response is received and roaming  mode  is  set  to
then will try to re-associate and if that fails trigger a scan to
look for the access point or another suitable AP.  When the state
machine is being operated manually, e.g. by then applications are
notified of the state change and are responsible for handling the
work  of  scanning  for a new access point.  The number of beacon
miss events (without a ProbeResponse) is user settable  with  the
request.   Software  beacon  miss detection is enabled per-vap by
setting the flag.  Typically this is done when  a  vap  is  setup
when  the option is supplied to the clone operation.  But drivers
may also force this when they know they need help detecting  bea‐
con  miss.  When beacon miss is detected in software the event is
dispatched without driver involvement.  Note that software beacon
miss handling is not limited to station mode; it can be  used  in
any  operating  mode  where  beacons  from a peer station are re‐
ceived.







































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