actually set ID of packet structs

dmx.go

@@ -48,7 +48,9 @@ func (ad *ArtDmx) UnmarshalBinary(data []byte) error {
 		return errors.New("ArtDmx packet must be at least 18 bytes long")
 	}
 
-	if !slices.Equal(ArtNetID, data[0:8]) {
+	ad.ID = data[0:8]
+
+	if !slices.Equal(ArtNetID, ad.ID) {
 		return errors.New("ID does not match Art-Net ID")
 	}
 

poll.go

@@ -53,7 +53,9 @@ func (ap *ArtPoll) UnmarshalBinary(data []byte) error {
 		return errors.New("ArtPoll packet must be at least 14 bytes long")
 	}
 
-	if !slices.Equal(ArtNetID, data[0:8]) {
+	ap.ID = data[0:8]
+
+	if !slices.Equal(ArtNetID, ap.ID) {
 		return errors.New("ID does not match Art-Net ID")
 	}