Hello,
With PRTG you can monitor your device via Telnet by using the Port sensor to execute a command and then, check the response code or the text returned. Here is the manual of the Port sensor: https://www.paessler.com/manuals/prtg/port_sensor
You can also write custom scripts which use the EXE/Script Advanced sensors whose manual are here:
https://www.paessler.com/manuals/prtg/exe_script_sensor
https://www.paessler.com/manuals/prtg/exe_script_advanced_sensor
Please, take a look at this KB article which explains how to collect data via Telnet by using PowerShell scripts:
https://kb.paessler.com/en/topic/68019-collect-data-via-telnet-or-web-interface
If your device is also SNMP-capable, you can import your own MIB file in PRTG with our tool MIB Importer: https://www.paessler.com/tools/mibimporter
Afterwards, add a new SNMP library sensor and select the oidlib file you have imported.
Then you should be able to select the different aspects of your device you would like to monitor.
Kind regards.
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