🧹 update opcua subcommand help

providers/opcua/config/config.go

@@ -15,16 +15,22 @@ var Config = plugin.Provider{
 	ConnectionTypes: []string{provider.ConnectionType},
 	Connectors: []plugin.Connector{
 		{
-			Name:      "opcua",
-			Use:       "opcua",
-			Short:     "OPC UA",
+			Name:  "opcua",
+			Use:   "opcua [--endpoint <endpoint>]",
+			Short: "OPC UA",
+			Long: `The opcua sub-command is designed for interfacing with resources on an OPC UA (Open Platform 
+Communications Unified Architecture) server, a protocol facilitating machine-to-machine communications within 
+the realm of industrial automation.
+`,
+
 			Discovery: []string{},
 			Flags: []plugin.Flag{
 				{
 					Long:    "endpoint",
 					Type:    plugin.FlagType_String,
 					Default: "",
-					Desc:    "OPC UA service endpoint",
+					Desc:    "OPC UA endpoint URL of the OPC UA server in the format opc.tcp://<host>:<port>",
+					Option:  plugin.FlagOption_Required,
 				},
 			},
 		},

providers/opcua/main.go

@@ -10,6 +10,13 @@ import (
 	"go.mondoo.com/cnquery/providers/opcua/provider"
 )
 
+// This is the entry point for the OPCUA provider.
+//
+// To test the provider, start the simulator:
+// docker run --rm -it -p 50000:50000 -p 8080:8080 --name opcplc mcr.microsoft.com/iotedge/opc-plc:latest --pn=50000 --autoaccept --sph --sn=5 --sr=10 --st=uint --fn=5 --fr=1 --ft=uint --gn=5 --ut --dca
+//
+// Once the simulator is running, you can query it:
+// cnquery shell opcua --endpoint opc.tcp://localhost:50000
 func main() {
 	plugin.Start(os.Args, provider.Init())
 }