Mission Planner already supports
dump1090 sbs on tcp 30003
dump1090 avr on tcp 30002
rtl1090 sbs1 on tcp 31004
rtl1090 avr on tcp 31001
adsb# on tcp 47806
if when you start mission planner one of these program is listening on the local pc on those port, mp will decode the adsb packets.
and adsb is enabled in MP options