Dump1090-fa failure

[ua549]

After a reboot dump1090-fa didn’t load. here is the status:

sudo systemctl status dump1090-fa
dump1090-fa.service - dump1090 ADS-B receiver (FlightAware customization)
Loaded: loaded (/lib/systemd/system/dump1090-fa.service; enabled; vendor pres
Active: activating (auto-restart) (Result: exit-code) since Wed 2020-07-08 15
Docs: https://flightaware.com/adsb/piaware/
Process: 6470 ExecStart=/usr/share/dump1090-fa/start-dump1090-fa --write-json
Main PID: 6470 (code=exited, status=1/FAILURE)

This is on a RPi 4B fully updated.
How can I resolve this error?

[wiedehopf]

Log not saying anything?
https://github.com/wiedehopf/adsb-wiki/wiki/Debug-commands

You can rtl_test the SDR as well.

Edit: on closer inpection:

@ua549

Process: 6470 ExecStart=/usr/share/dump1090-fa/start-dump1090-fa --write-json

That seems like a bad command line …
Not completely sure.

Maybe check sudo dmesg for input/output error as in sd-card failure.

[ua549]

I got it going again by using a different USB port (no other changes). I don’t know if a port failed, the connector was dirty or the connection was marginal. The SDR tested ok with rtl_test on my PC. The dump1090-fa logs cycled between finding a device and not finding a device. The dmesg output was lengthy and I’m not sure how to interpret it. Thanks @ wiedehopf for the link to the debug commands.