There is no way to execute commands on an unmanaged device. The CLI template option achieves the expected outcome.

Hi,   You might use the REST API CLI Template endpoints, to create, deploy a CLI template to run it to target list of devices, then collect the CLI ouput outcome in the job result. Take a look:https://developer.cisco.com/site/prime-infrastructure/doc...

To solve it at least on Win OS, you can open the client using the 'Run as administrator' option

Try to clean the Java JRE cache files and launch the client jnlp file again.If the error persists, please open a TAC case.

In addition to NET-SNMP monitoring you can use the PI REST API