I had compile this code for RPi5 and OPi5 with success.

English translation of this manual:

To compile on Raspberry Pi, install at least the basics for building. For the rest of the procedure, I assume you are using Debian 12.
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apt install build-essential autoconf libssl-dev libpcre2-dev libmodbus-dev

Download the netxms source code from the website.
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https://netxms.com/download/releases/5.2/netxms-5.2.7.tar.gz
Unzip it to /opt/netxms, for example.

Then run configure and make in the directory.
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./configure --with-libmodbus --with-libssh --with-snmp --with-agent --with-openssl --with-client-proxy --with-static-subagents-list=ssh
make
make install
ldconfig
For systemd, the unit file is available after compilation in /opt/netxms/netxms-5.2.7/contrib/startup/systemd/netxms-server.service, so copy it to /etc/systemd/system
Create a basic configuration file in /etc/nxagentd.conf according to the documentation

Then register the unit, try to start the service, and check it out.
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systemctl daemon-reload
systemctl start netxms-agent
systemctl status netxms-agent

This is the minimum configuration for the agent; hopefully, it will be sufficient for your purposes.
The agent log is according to the agent configuration, where you will find further operational information if it starts.
LogFile=/var/log/nxagentd

But I have some troubles with ssh connection to node from NetXMS client. Is it due to I am connecting from client without VPN and nodes are in VPN? Support for ssh should be included in the compilation.

nxagentd -D 6

In this mode it should put it's log right to the terminal. Pls share the output

sudo systemctl status nxagentd

× nxagentd.service - NetXMS Agent
    Loaded: loaded (/lib/systemd/system/nxagentd.service; enabled; preset: enabled)
    Active: failed (Result: exit-code) since Sun 2025-11-09 14:05:47 CET; 2min 54s ago
    Process: 1361070 ExecStart=/usr/bin/nxagentd -d (code=exited, status=127)
        CPU: 1ms

lis 09 14:05:47 mama-rpi systemd[1]: nxagentd.service: Scheduled restart job, restart counter is at 5.
lis 09 14:05:47 mama-rpi systemd[1]: Stopped nxagentd.service - NetXMS Agent.
lis 09 14:05:47 mama-rpi systemd[1]: nxagentd.service: Start request repeated too quickly.
lis 09 14:05:47 mama-rpi systemd[1]: nxagentd.service: Failed with result 'exit-code'.
lis 09 14:05:47 mama-rpi systemd[1]: Failed to start nxagentd.service - NetXMS Agent.

Point 1 :
 

you have to add new source for apt in /etc/apt/sources.list.d/

  Be carreful on version :deb http://packages.netxms.org/raspbian stretch main
  To know raspbian realease : cat /etc/os-release

Point 2 :

wget -q -O - http://packages.netxms.org/netxms.gpg | sudo apt-key add -  => wrong
wget -q -O - https://packages.netxms.org/netxms.gpg | sudo apt-key add -  => Ok

Use httpS: instead of http:

For those wanting all the info, below are all the steps I followed, however I had to comment out the other line (deb http://packages.netxms.org/debian stretch main) in netxms.list.  This file already existed, I guess due to some of the steps I followed earlier

Create new file named netxms.list in /etc/apt/sources.list.d/ with content like this, Comment out existing line

deb http://packages.netxms.org/raspbian stretch main
#deb http://packages.netxms.org/debian stretch main

wget -q -O - http://packages.netxms.org/netxms.gpg | sudo apt-key add -
sudo apt-get update
sudo apt-get install netxms-agent
sudo nano /etc/nxagentd.conf
sudo systemctl enable nxagentd

Edit nxagentd.conf and change MasterServers to your NetXMS server
The default file had 127.0.0.1/8, I had to remove the CIDR notation to get it to work

sudo service nxagentd restart

you have to add new source for apt. Create new file named netxms.list in /etc/apt/sources.list.d/ with content like this:

deb http://packages.netxms.org/raspbian stretch main

You may also need to install GPG key with command

wget -q -O - http://packages.netxms.org/netxms.gpg | sudo apt-key add -

Best regards,
Victor

I'm not quite sure what to do with this knowledge... how do I proceed?  I found a deb file under the raspbian folder and I tried this below:

What am I missing?

pi@retropie:~ $ wget https://packages.netxms.org/raspbian/pool/jessie/main/n/netxms/netxms-agent_2.1-M2-1_armhf.deb
--2019-07-01 04:18:57--  https://packages.netxms.org/raspbian/pool/jessie/main/n/netxms/netxms-agent_2.1-M2-1_armhf.deb
Resolving packages.netxms.org (packages.netxms.org)... 5.9.112.213
Connecting to packages.netxms.org (packages.netxms.org)|5.9.112.213|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 196588 (192K) [application/octet-stream]
Saving to: ‘netxms-agent_2.1-M2-1_armhf.deb’

netxms-agent_2.1-M2-1_armhf.deb       100%[=======================================================================>] 191.98K   623KB/s    in 0.3s

2019-07-01 04:18:58 (623 KB/s) - ‘netxms-agent_2.1-M2-1_armhf.deb’ saved [196588/196588]

pi@retropie:~ $ sudo dpkg -i netxms-agent_2.1-M2-1_armhf.deb
Selecting previously unselected package netxms-agent:armhf.
(Reading database ... 96679 files and directories currently installed.)
Preparing to unpack netxms-agent_2.1-M2-1_armhf.deb ...
Unpacking netxms-agent:armhf (2.1-M2-1) ...
dpkg: dependency problems prevent configuration of netxms-agent:armhf:
 netxms-agent:armhf depends on netxms-base (= 2.1-M2-1); however:
  Package netxms-base is not installed.
 netxms-agent:armhf depends on netxms-dbdrv-sqlite3 (= 2.1-M2-1); however:
  Package netxms-dbdrv-sqlite3 is not installed.
 netxms-agent:armhf depends on libsensors4 (>= 1:3.1.1); however:
  Package libsensors4 is not installed.
 netxms-agent:armhf depends on libssl1.0.0 (>= 1.0.0); however:
  Package libssl1.0.0 is not installed.

dpkg: error processing package netxms-agent:armhf (--install):
 dependency problems - leaving unconfigured
Processing triggers for systemd (232-25+deb9u11) ...
Errors were encountered while processing:
 netxms-agent:armhf
pi@retropie:~ $

I believe you need to change the URL in your sources file to http://packages.netxms.org/raspian (from http://packages.netxms.org/debian).

https://packages.netxms.org/raspian returns 404.

Thanks