bts: Print the kind of message type not known.
diff --git a/src/bts.cpp b/src/bts.cpp
index 07e97de..36150d7 100644
--- a/src/bts.cpp
+++ b/src/bts.cpp
@@ -1107,7 +1107,9 @@
 		break;
 	default:
 		bts()->decode_error();
-		LOGP(DRLCMAC, LOGL_NOTICE, "RX: [PCU <- BTS] unknown control block received\n");
+		LOGP(DRLCMAC, LOGL_NOTICE,
+			"RX: [PCU <- BTS] unknown control block(%d) received\n",
+			ul_control_block->u.MESSAGE_TYPE);
 	}
 	talloc_free(ul_control_block);
 	return 1;