driveTxPriorityQueue(): enrich logging message

Change-Id: If25c2171f7d1ab98d65f0dbf93d0d8a5a635caf7
diff --git a/Transceiver52M/Transceiver.cpp b/Transceiver52M/Transceiver.cpp
index a12c5bc..0a832f0 100644
--- a/Transceiver52M/Transceiver.cpp
+++ b/Transceiver52M/Transceiver.cpp
@@ -955,7 +955,9 @@
     return false;
   }
 
-  LOG(DEBUG) << "rcvd. burst at: " << GSM::Time(fn, chdr->tn);
+  LOG(DEBUG) << "Rx TRXD message (hdr_ver=" << chdr->version << "): "
+             << "fn=" << fn << ", tn=" << chdr->tn << ", "
+             << "burst_len=" << burstLen;
 
   int RSSI = (int) buffer[5];
   BitVector newBurst(burstLen);