I installed the uAvionix ADS-B PingRx recently to my Quad running Arducopter V4.0.5 on Pixhawk 2.8.4. PingRx is connected to serial 4/5 port of Pixhawk. Live traffic is displayed on MP someday, but the next day, there is no live traffic (compared to online flight tracking software and local airport traffic movement), even though the PingRx LED flashes.
I also tried connecting it to Serial 1 and Serial 2 port of Pixhawk, but nothing change. I did not change any setting after seeing live traffic display on MP
Screenshot of ADS-B related setting is attached.
The SR1_ADS_B and SR2_ADS_B are both 5 Hz.
I also tried checking the box under GCS ID in PLANNER page, and agreed on the default values of Server IP as 127.0.0.1, and Server port as 30003. But all these do not help.