Regarding Observation 5398098
Can it be that the satellite transmits, clear readable data as observed:
„sf1.png" does not exist“
&
„753.8KiB 2022-02-02 21:05:56 sf01.png“
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Seems that it is something like ftp logs…
Yes - the next passes revealed more of these type of commands. Seems nominal behaviour. Interesting that they use such file-based and ASCII coded commanding directly. It needs lot of time and space…
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I think I have seen this in other satellites too.
This is CSP…
A common and well known „feature“ of the GOMSpace radios…
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Thanks - found the Cubesat Space Protocol (CSP) and the related implementations.
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I am not very familiar with it thus the sparse informations. It looks like some kind of FTP downloads…
Oh, nice! We are under surveillance 
Yes, we are using CSP and most of communication is in binary. But our payload is linux based computer, so we have also “backdoor” access, which sends raw ascii command to S/C and reply is also ascii. We uses ascii commands in manned operation mode during commissioning phase.
We also have FTP implemented on top of CSP. But it looks different:
https://network.satnogs.org/observations/5415518/
Btw, this is how I saw the contact:
> rsh 1 "y ls sf1.png"
rv=7,reply_len=30
"/df/sf1.png" does not exist
> ping 7
Ping node 7, timeout 3000 ms, size 1 B: Reply in 970 ms
> rsh 7 "ls"
rv=0,reply_len=106
bin
configfs
dev
etc
lib
lib32
linuxrc
lost+found
media
mnt
opt
proc
root
run
sbin
sf
sys
tmp
usr
var
vc
> rsh 1 "y ls sf01.png"
rv=0,reply_len=41
753.8KiB 2022-02-02 21:05:56 sf01.png
> rsh 7 "ls -l /sf/foto/0586894.png"
rv=0,reply_len=79
-rw-r--r-- 1 root root 771894 Jan 1 00:48 /sf/foto/0586894.png
> rsh 7 "md5sum /sf/foto/0586894.png"
rv=0,reply_len=56
21220758cab2fc345b4a3d8e14036c98 /sf/foto/0586894.png
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Hello,
as an author of the dual-camera payload of VZLUSAT-2, operating via @psvoboda, I just signed up in order to respond.
If you wish to hear more funny ASCII traffic, stay on tune during Monday / central European passes. If we are lucky enough, in response there shall come first short image transfers. Maybe you can be the first who can see something, before TV and media!
GL,
Marek / Eltvor Ltd.
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Hi,
will certainly watch-out. Good luck with your operations and thanks for informing!
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@eltvor could you give us some timestamps so we can schedule some satnogs stations to watch these downlinks?
It will depend on our success ratio during contacts. For now, these are scheduled for EO image download activity:
2022-02-07, Contacts starting from 9:21, 10:55, 20:07 and 21:43 UTC
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