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Greetings,</div>
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<br>
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I am writing to consult about an issue I've encountered over the past few days - One which I've come to understand possibly stems from a flaw within the way NUT implements its instant commands via SNMP.</div>
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<br>
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I will preface this by saying that my configuration is using hardware that is <b>
not </b>officially supported</div>
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( It's a Makelsan-branded UPS, of the 'Powerpack-SE' Series with an external 'iStars mini' SNMP card. ),</div>
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but I believe this issue is common to all hardware that abides by <b>RFC-1628</b> controlled using the
<b>snmp-ups</b> driver.</div>
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My reasoning for this is SNMP packet inspection of NUT's output, compared to that of an 'iStars' proprietary control software, which actually succeeds in getting the hardware to react as expected:</div>
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<br>
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[NUT upscmd, starting a self-test. Fails to start the self-test.]</div>
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variable-bindings:</div>
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1.3.6.1.2.1.33.1.7.1.0: <b>0</b></div>
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<b><br>
</b></div>
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[iStars proprietary control program, starting self-test. Starts the self-test.]</div>
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variable-bindings:</div>
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1.3.6.1.2.1.33.1.7.1.0: <b>1.3.6.1.2.1.33.1.7.7.4</b></div>
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<br>
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According to some <a href="https://circitor.fr/Mibs/Html/UPS-MIB.php" id="OWA34a9bcb4-6f04-63b2-ad4d-774910435b35" class="OWAAutoLink">
MIB descriptions</a> I found online, the NUT implementation only sends a 'header' object identifier that prefaces all ups tests, while the proprietary method also includes the specific type of test to perform.</div>
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I believe this is because the 'upscmd' program is unable to pass values to it's commands that include
<b>non</b>-alphanumerical symbols, like <b>periods</b>, as attempting to manually pass a value like '1.3.6.1.2.1.33.1.7.7.4' to the self-test command
<b>always </b>fails.</div>
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<br>
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All of this stems from my speculation. I'm not well-accustomed to this toolkit to create a bug report in full confidence.</div>
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Any help with this matter is much appreciated, and if this issue is still somehow isolated to only this unsupported manufacturer, I apologize for any confusion.</div>
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<br>
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Kind regards,</div>
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P.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Nut-upsuser <nut-upsuser-bounces+pavlas=k-net.cz@alioth-lists.debian.net> on behalf of nut-upsuser-request@alioth-lists.debian.net <nut-upsuser-request@alioth-lists.debian.net><br>
<b>Sent:</b> Tuesday, May 19, 2026 8:50 AM<br>
<b>To:</b> Albert Pavlas <albert.pavlas@k-net.cz><br>
<b>Subject:</b> Welcome to the "Nut-upsuser" mailing list (Digest mode)</font>
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