Skip GroupRead events when listening for messages

This avoids additional metrics with the address of the requesting device
and value `0` for configured group addresses.

pkg/knx/listener.go

@@ -84,6 +84,11 @@ func (l *listener) handleEvent(event knx.GroupEvent) {
 		return
 	}
 
+	if event.Command == knx.GroupRead {
+		logger.Debug("Skip group event as it is a GroupRead message.")
+		return
+	}
+
 	value, err := unpackEvent(event, addr)
 	logger = logger.With("dpt", addr.DPT)
 

pkg/knx/listener_test.go

@@ -91,6 +91,12 @@ func Test_listener_Run(t *testing.T) {
 			nil,
 			true,
 		},
+		{
+			"group read event",
+			knx.GroupEvent{Destination: cemi.GroupAddr(6), Command: knx.GroupRead, Data: []byte{0}},
+			nil,
+			true,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {