Spectrogram: Internal Server Error

[ChadOhman]

Hello, just installed r2cloud on a Raspberry Pi 3B+. Had a few NOAA passes but all three passes give me this error when I ask it to generate a spectrogram. What's happening?

Thanks!

[dernasherbrezon]

Hey, can you check the logs?

journalctl -u r2cloud -n 200

[ChadOhman]

log.txt

See attached. Thanks :)

[dernasherbrezon]

The root cause is here:

Jun 09 06:15:07 satpi java[538]: usb_claim_interface error -6

Something else is using rtl_sdr. You can check this:

ps aux|grep rtl_sdr

In the meantime I will improve error reporting in r2cloud.

[ChadOhman]

Interesting. I flashed an SD card with the latest r2cloud image.

pi@satpi:~ $ ps aux|grep rtl_sdr
pi         618  0.0  0.1   7676  1760 ?        S    Jun08   0:00 /bin/bash ./etc/rtl_sdr_wrapper.sh -rtl rtl_sdr -f 436369147 -s 240000 -g 45 -p 0 -o /tmp/45115-1591650799565.raw.gz
pi         619  0.2  0.2  14880  1932 ?        Sl   Jun08   1:50 rtl_sdr -f 436369147 -s 240000 -p 0 -g 45 -
pi        3830  0.0  0.0   7348   536 pts/0    S+   09:52   0:00 grep --color=auto rtl_sdr

Now that I'm looking at it, this thread is really chewing up a significant portion of the 32GB sd card in the pi...

[dernasherbrezon]

Ok. Look like the process hanged. Have you killed java manually?

Can you do: 1) Kill rtl_sdr and rtl_sdr_wrapper.sh 2) Remove tmp file: rm /tmp/*.raw.gz 3) Restart r2cloud: sudo systemctl restart r2cloud.

[ChadOhman]

Hi, I ended up doing a full reboot before bed. Turns out that solved it and it seemed to have detected that tmp file and deleted it on its own.