Hi
I have a issue with Modbus TCP Plugin in CheckMK RAW v2.3.0p9.
I thought I had done everything, but I’m stuck here, the screen from the …/web.log
Could You help me?
Thank You and best regards!
Could You help me?
Thank You and best regards!
Can you perhaps include v2 of the agent_modbus into check_mk default repository?
Maybe a stupid question, but unfortunately I don’t know, I’m still learning CheckMK, Where can I find v2 of agent_modbus?
How can I add it?
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See the post Check Agent for Modbus - #19 by vtacquet?
I finally upgraded agent_modbus to v2, but still have the same problem.
For testing I have run Check_MK v 2.1.0p48 and everything works fine, on version 2.3.0p48 which runs in production, unfortunately not.
Additional screen from Check_MK
The path checkmk is showing seems odd to me. The modbus.py should not be in there in my opinion. Every third party addon should be below ~/local.
Could it be, that you manually copied or moved it there ?
If you remove the modbus package and the file is still there, i would delete / move it away from there and test again.
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I did everything in both versions (2.1.0p48 and 2.3.0p48) the same way from this manual:
Check Agent for Modbus - #6 by paulosantanabr.
I did a test on a new system (Debian 12.7.0), installed the latest version of CheckMK 2.3.18 and got a similar error with the modbus plug-in. As far as I can see the problem with the plugin is from CheckMK version 2.3 upwards.
Hi,
I am getting the same Failed to load plug-in error.
name ‘TextInput’ is not defined.
It seems to be just the plugin at issue in my case, as I get correct results when calling agent_modbus manually.
I am running omd Version 2.3.0p21.cre
Did anyone get any resolution to this issue?
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vim ./share/check_mk/web/plugins/wato/modbus.py
Add ->> from cmk.gui.valuespec import (TextInput, ListOf,)
2 Likes
@wjs67
The plug-in now seems to be working properly 
I have no more errors
Thank You!
Modbus plugin for CMK v2.4, available at:
- Let me know about any questions or suggestions.
2 Likes
Will your work be published as a finished package on exchange?
That would be very helpful for me as a beginner.
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I tried to implement it but I see in only in “Other integrations”:
I can do the configurations but it is not used at all …
What am I missing?
The agent itself works fine on command line:
OMD[cmk]:~$ ~/local/lib/python3/cmk_addons/plugins/modbus/libexec/agent_modbus 192.168.xxx.yyy 502 255 107:1:counter:result_code
<<<modbus_value>>>
107 0 counter result_code
If register 107 is not 0 this is the error code of my wallbox.
So output looks good to me.
My Bad!!
I had to enable the API integrations …
But how do I now create warnings/critical events for specific values?
Hi @mmartin ,
as a short guide, this is how I installed the modbus agent but I agree, putting it on exchange would be much better.
su <SITENAME>
mkdir ~/local/lib/python3/cmk_addons/plugins/modbus
mkdir ~/local/lib/python3/cmk_addons/plugins/modbus/agent_based
mkdir ~/local/lib/python3/cmk_addons/plugins/modbus/checkman
mkdir ~/local/lib/python3/cmk_addons/plugins/modbus/libexec
mkdir ~/local/lib/python3/cmk_addons/plugins/modbus/rulesets
mkdir ~/local/lib/python3/cmk_addons/plugins/modbus/server_side_calls
wget https://raw.githubusercontent.com/wjs67/check_mk_plugins/refs/heads/main/modbus/agent_based/modbus.py -P ~/local/lib/python3/cmk_addons/plugins/modbus/agent_based
wget https://raw.githubusercontent.com/wjs67/check_mk_plugins/refs/heads/main/modbus/checkman/modbus -P ~/local/lib/python3/cmk_addons/plugins/modbus/checkman
wget https://github.com/wjs67/check_mk_plugins/raw/refs/heads/main/modbus/libexec/agent_modbus -P ~/local/lib/python3/cmk_addons/plugins/modbus/libexec
wget https://raw.githubusercontent.com/wjs67/check_mk_plugins/refs/heads/main/modbus/rulesets/modbus.py -P ~/local/lib/python3/cmk_addons/plugins/modbus/rulesets
wget https://raw.githubusercontent.com/wjs67/check_mk_plugins/refs/heads/main/modbus/server_side_calls/modbus.py -P ~/local/lib/python3/cmk_addons/plugins/modbus/server_side_calls
chmod 700 ~/local/lib/python3/cmk_addons/plugins/modbus/libexec/agent_modbus
wget https://raw.githubusercontent.com/wjs67/check_mk_plugins/refs/heads/main/modbus/mkp/modbus.manifest.temp -P ~/tmp
mkp package ~/tmp/modbus.manifest.temp
rm ~/tmp/modbus.manifest.temp
mkp list
This will first download all files into the directories. After a restart you can use the agent.
Or (2nd part): You can create a mkp and see it in mkp list for example.
1 Like