@ Matthew, thanks. I need now to "digest" all this information, it's a bit 
high level for me ;-)

@ Stefanos, thanks too, I tested my USB SDR key and obtain the same result 
as yours : "Bus 003 Device 003: ID 0bda:2838 Realtek Semiconductor Corp. 
RTL2838 DVB-T"

Pierre-Yves
Le mardi 6 février 2024 à 18:17:07 UTC+1, Stefanos Kalaitzis a écrit :

> i forgot to write in my last message  that when you finished you must 
> restart udev or restart the device you using( p.c , rpi ,... etc)
>
> On Tuesday, February 6, 2024 at 7:11:07 PM UTC+2 matthew wall wrote:
>
>> On Tuesday, February 6, 2024 at 11:38:24 AM UTC-5 Pierre-Yves wrote:
>>
>> It seems to be a problem of rules change. In fact, I first upgraded from 
>> 4.10.2 to 5.0.0 and weewx worked perfectly. 
>>
>>
>> weewx was running as root:root. weewx 5.0.0 did not modify any 
>> permissions when it upgraded from 4.10.2.
>>  
>>
>> Then I went from 5.0.0 to 5.0.1 an weewx failed to start.
>>
>>
>> weewx was running as weewx:weewx.  weewx 5.0.1 converts from root:root 
>> permissions to weewx:weewx permissions, and runs the daemon as weewx.
>>  
>>
>> For Weewx,, I did a deb/rpm install and, as far I remember, I installed 
>> rtl-sdr following your Git (https://github.com/matthewwall/weewx-sdr).
>>
>> I tried the command you proposed (sudo usermod -aG plugdev weewx) but 
>> that doesn't solve the problem.
>>
>>
>> is there a udev rules file for sdr?  (it is a separate step when you 
>> build rtl-sdr from source)
>> if there is a udev rules file for sdr, how are the permissions set?
>> did the usermod for weewx succeed?
>> is weewx in the plugdev group?  (grep weewx /etc/group)
>> did you restart weewxd after putting weewx into the plugdev group?
>>  
>>
>> Regarding the rtl-sdr rules, I have a doubt. I installed the file in 
>> /etc/weewx/udev/rules.d. Maybe it is a wrong place... I read in another 
>> thread that it should be in /usr/lib/udev/rules.d... What about ?
>>
>>
>> packages install to /usr/lib/udev/rules.d
>>
>> system administrators (or end-users acting as system administrators) put 
>> things in /etc/udev/rules.d
>>
>> that way you can override whatever a package installs, and your changes 
>> will not be overwritten by the package when you upgrade/update.
>>  
>>
>

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