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Not Writable error while to write a parameter value in a table

Solved97 views4 days ago
2
Dominique Bodart [DevOps Member]731 7th August 2025 0 Comments

Hi,

I need to edit some values in a snmp table. To proceed, my table has an automatic index (1, 2 , ...) and I created a write parameter to be able to edit the it with options="snmpset". I can see the driver tries to write the value I entered but in return it sends back the following:

-> 14:33:44 - Set for parameter moduleSettingsModuleGain to 2400.000000
-> 14:33:44 - Set for moduleSettingsModuleGain () failed : NOT WRITABLE

Here follows the parameters mentioned above:

<Param id="2003" trending="false">
<Name>moduleSettingsModuleGain</Name>
<Description>Module Gain (Module Settings)</Description>
<Information>
<Subtext>
<![CDATA[Gain setting (in hundredths of dB)]]>
</Subtext>
</Information>
<Type>read</Type>
<Interprete>
<RawType>numeric text</RawType>
<Type>double</Type>
<LengthType>next param</LengthType>
<Sequence noset="true">div:100</Sequence>
</Interprete>
<SNMP>
<Enabled>true</Enabled>
<OID type="complete">1.3.6.1.4.1.20938.1.6.6.1.2.1.5</OID>
<Type>integer32</Type>
</SNMP>
<Display>
<RTDisplay>true</RTDisplay>
<Units>dB</Units>
<Decimals>2</Decimals>
</Display>
<Measurement>
<Type>number</Type>
</Measurement>
</Param>
<Param id="2103" options="snmpset">
<Name>moduleSettingsModuleGain</Name>
<Description>Module Gain (Module Settings)</Description>
<Type>write</Type>
<Interprete>
<RawType>numeric text</RawType>
<Type>double</Type>
<LengthType>next param</LengthType>
<!-- <Sequence noset="true">div:100</Sequence> -->
</Interprete>
<SNMP>
<Enabled>true</Enabled>
<OID type="complete">1.3.6.1.4.1.20938.1.6.6.1.2.1.5</OID>
<Type>integer32</Type>
</SNMP>
<Display>
<RTDisplay>true</RTDisplay>
<Units>dB</Units>
<Decimals>2</Decimals>
</Display>
<Measurement>
<Type>number</Type>
</Measurement>
</Param>

Do you see anything wrong? Did I miss something?

Marieke Goethals [SLC] [DevOps Catalyst] Selected answer as best 4 days ago

2 Answers

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1
Thomas Cauwelier [SLC] [DevOps Advocate]1.65K Posted 5 days ago 0 Comments

Hi Dominique,

I’ve already replied via email, but I’m posting here as well in case others encounter the same issue.

The problem was caused by using snmpSet without appending the instance OID. Unlike snmpSetAndGet, snmpSet doesn’t add this automatically. Full instructions can be found here:
Using a Parameter Holding the Instance

While snmpSetAndGet is a lot easier to work with, it does not support the sequence option.

Marieke Goethals [SLC] [DevOps Catalyst] Selected answer as best 4 days ago
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