Thanks to @andreas-doehler I copy the file on the right place : but nothing happens.
After that, I query the oid @tosch mentioned :
snmpwalk -v1 -c <community> <ip address> 1.3.6.1.2.1.1.2.0
iso.3.6.1.2.1.1.2.0 = OID: iso.3.6.1.4.1.9.1.2391
I replace .1.3.6.1.4.1.9.1.2860 by .1.3.6.1.4.1.9.1.2391 in the corrected plugin file, restart the site, full scan on the device : nothing new…
I noticed that there’s a new directory in ~sitename/local/lib/python3/cmk/base/plugins/agent_based : __pycache__…
Did I do something wrong ?