How to centrally monitor networks at small objects?

Question

Monitoring

Hello.
There are a number of clients - from small ones (with a dedicated server) to very small ones (only a router, computer and cash desk). Often the internal ranges of IP addresses of different objects/clients are the same. I want to monitor the state of their infrastructure.
I am looking for a monitoring tool with active agents (which themselves send the state to the server) and a lightweight relay / proxy under Windows, which in active mode can monitor equipment on which you cannot put an agent: routers, telephones, scales, etc.
Of the more or less suitable ones, I looked at Zabbix. He can have agents in active mode, but there is little place for a proxy - you need a separate computer or virtual machine with Linux.
The rest found, plus or minus the same situation.

Answer 1

I haven't tried it myself, but it immediately came to mind:
https://openwrt.org/packages/pkgdata/zabbix-proxy

Installed size: 341kB

Answer 2

nrpe w :) or for Windows nsclient++. I think you can write your own script and give it to nsclient for execution. The scheme is the same as with nrpe - nagios requests Windows (here you will have to forward ports, of course) on port 5666, sending a request for the execution of an agent, which is actually a script that itself requests, for example, a cash register via snmp (if it has one) and the response returns as a result, and nsclient++ returns this response as its result. Here the whole problem is to embed the necessary sensors in nsclient ++, generally speaking it was written for local monitoring, but you never know ...