ModSnmp can be passed the name of a settings file on the command line. For example:

This is optional when running interactively, but is required when running as a server.

To get ModSnmp to "run" automatically (i.e. connect to the Modbus devices and listen for SNMP requests), pass the -auto option on the command line:

Note that the -auto option must come after modsnmp3.15.jar.

To run ModSnmp without a GUI, pass the -nogui option on the command line. The -nogui option implies -auto, so the command normally used to run ModSnmp as a server looks like:

Note that the -nogui option must come after modsnmp3.15.jar.

When ModSnmp is started with the -auto or -nogui option, it will automatically start listening for SNMP requests and also attempt to connect to the Modbus devices. If a non-fatal error occurs when attempting to connect a Modbus device (or if the connection is lost), ModSnmp will periodically try again to connect.