I’ve setup the client and gr-satnogs successfully but when an observation finishes i get no waterfall and no audio.
Attaching log file. See exception near the end.
log.txt (2.3 MB)
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The only error I can spot in logs is this one:
/bin/sh: 1: satnogs_cw_demod.py: Exec format error
Not sure what it means, I suggest before the next observation from network to run manually gnuradio scripts (cw or fm). Something similar to the next command should produce waterfall and audio file:
satnogs_fm_demod.py --rx-sdr-device=rtlsdr --rx-freq=444000000 --file-path=./audio-out.ogg --waterfall-file-path=./waterfall.dat
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How was gr-satnogs installed, what version of gnuradio libs were used?
I recompiled gr-satnogs and now it look like it works.
I did a dummy (no antenna) observation and i got waterfall/radio.
https://network-dev.satnogs.org/observations/2245/
I used gr 3.7.10
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Awesome… looking forward for an observation with antenna 
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Is there a way to run a custom script before and after an observation?
I have modified CHIP board to allow software power off of USB port to save power so ideally i would like to power on the rtl-sdr before the observation and power it off again once done.
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It looks like there is (though someone from the project should probably confirm this):
- If you’re running the Raspbian image, you can run
satnogs-setup -nand setSATNOGS_PRE_OBSERVATION_SCRIPTandSATNOGS_POST_OBSERVATION_SCRIPT(both under the “Advanced configuration options” entry in the menu). - If you’re not running Raspbian, you’ll need to set the environment variables
SATNOGS_PRE_OBSERVATION_SCRIPTandSATNOGS_POST_OBSERVATION_SCRIPT.
However, looking at the code I think the post-observation script may be run twice (here and here). (The pre-observation script is only run once.) If that’s the case, you may want to be careful that this won’t cause problems for you.