Degrade the sensor state from OK to WARNING and CRITICAL after periods of ten minutes (same behaviour as nmea(4)).  If the cable is pulled, the sensor no longer keeps the OK status forever.  Tested with a PEX511 as MSTS sender.
Degrade the sensor state from OK to WARNING and CRITICAL after periods of
ten minutes (same behaviour as nmea(4)).  If the cable is pulled, the sensor
no longer keeps the OK status forever.  Tested with a PEX511 as MSTS sender.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars