Set default lastMessageCount.
Set default lastMessageCount.

jprochazka/adsb-feeder,jprochazka/adsb-receiver,jprochazka/adsb-receiver,jprochazka/adsb-receiver,jprochazka/adsb-feeder,jprochazka/adsb-feeder,jprochazka/adsb-feeder,jprochazka/adsb-feeder,jprochazka/adsb-receiver,jprochazka/adsb-receiver