Once you bring up hub's UI, e.g. http://192.168.1.5/, add the endpoint to that URL, e.g. http://192.168.1.5/hub/allowSubnets?123.123.123.0,124.124.124.0
Once you bring up hub's UI, e.g. http://192.168.1.5/, add the endpoint to that URL, e.g. http://192.168.1.5/hub/allowSubnets?123.123.123.0,124.124.124.0