better output and more instructions in README.md to test rtdt-manager

applications/rtdt-manager/README.md

@@ -19,7 +19,6 @@ The application relies on building a local gnmi-target first based on the `inter
 $ git clone git@code.fbi.h-da.de:danet/gnmi-target.git
 $ git checkout interface-enabled-test
 $ make all
-
 ```
 The file under `yang/yang.go` was copied from the danet gnmi-target repo ([https://code.fbi.h-da.de/danet/gnmi-target](https://code.fbi.h-da.de/danet/gnmi-target)) after building it with `make all`.
 It is necessary so that YANG paths received through events in the callback function can be parsed and their type can be extracted. This is the mechanism
@@ -51,6 +50,12 @@ instances of RabbitMQ, MongoDB, etc.
 The rtdt-manager subscribes to specific events in the physical network and a callback is triggered when these events occur. In this callback, the YANG path of the data that experienced a change
 as well as the new value can be retrieved and are applied to the NDT.
 
+Changes can be applied to the physical network using `gosdnc prompt` and then typing the following (with an example path for MTU):
+```
+> login --controller 172.100.0.5:55055 --p TestPassword --u admin
+> networkElement path set <Choose a Target here> /interafces/interface[name=eth1]/config/mtu 2100 --force-push
+```
+
 Right now there are some bugs in the event system/controller. Changing the hostname works reliably (`/system/config/hostname`),
 the interfaces handler in the gNMI-target often triggers many unwanted events, so it's dangerous to subscribe to `interfaces/`
 on its own.

applications/rtdt-manager/rtdt-manager/rtdt-manager.go

@@ -489,7 +489,7 @@ func (r *RtdtManager) updateMNECallbackTwin(event *event.Event) {
 }
 
 func printEvent(event *event.Event) {
-
+    fmt.Println("\n")
 	fmt.Println("--------------------------------")
 	fmt.Println("---------- MNE EVENT -----------")
 	fmt.Println("EventID: ", event.ID.ID())
@@ -506,6 +506,7 @@ func (r *RtdtManager) updateMNECallbackRealnet(event *event.Event) {
 		benchmark.Current = benchmark.Benchmark0{}
 		benchmark.Current.StartTimeRealnet = time.Now()
 	}
+	printEvent(event)
 	prefixInterface := "/interfaces/interface[name="
 	prefixHostname := "/system/config/hostname"
 	//realnetClabData := r.realnet.GetClabData()
@@ -544,11 +545,11 @@ func (r *RtdtManager) updateMNECallbackRealnet(event *event.Event) {
 
 		// If experimental, just call it like this
 		if r.experimental {
-		    fmt.Println("Found twin to apply change to:", r.rtdt_twins[0].Name)
+			fmt.Println("Found twin to apply change to:", r.rtdt_twins[0].Name)
 			twin.SetGnmiPath(path, value, twinEntityID, r.benchmark0)
 			// Else filter it first
 		} else if strings.HasPrefix(path, prefixInterface) && strings.HasSuffix(path, suffixMTU) {
-			fmt.Println("--- CHANGE MTU TRIGGERED ---")
+			fmt.Println("\nFound change we can apply: --- MTU ---")
 			printEvent(event)
 
 			fmt.Println("Value of new MTU: ", value)
@@ -556,7 +557,7 @@ func (r *RtdtManager) updateMNECallbackRealnet(event *event.Event) {
 			// Set Hostname
 		} else if strings.HasPrefix(path, prefixHostname) {
 
-			fmt.Println("--- CHANGE HOSTNAME TRIGGERED ---")
+			fmt.Println("\nFound change we can apply: --- HOSTNAME ---")
 			printEvent(event)
 			for _, twin := range r.rtdt_twins {
 				if twin == nil {
@@ -571,6 +572,7 @@ func (r *RtdtManager) updateMNECallbackRealnet(event *event.Event) {
 				}
 			}
 		} else if regexMatchOperStatus != nil && len(r.rtdt_twins) > 0 {
+			fmt.Println("\nFound change we can apply: --- INTERFACE UP/DOWN ---")
 			fmt.Println("Setting interface", regexMatchOperStatus[1], "UP/DOWN")
 			fmt.Printf("match: %v\n", regexMatchOperStatus)
 			path := "/interfaces/interface[name=" + regexMatchOperStatus[1] + "]/config/enabled"