diff --git a/infrastructure-centred/owlps-aggregator/owlps-aggregator.h b/infrastructure-centred/owlps-aggregator/owlps-aggregator.h
index 76f4efa..2c56dc5 100644
--- a/infrastructure-centred/owlps-aggregator/owlps-aggregator.h
+++ b/infrastructure-centred/owlps-aggregator/owlps-aggregator.h
@@ -15,7 +15,7 @@
 
 
 /* Arguments & program configuration */
-#define OPTIONS "Aa:c:C:f:hi:k:K:l:o:p:t:" // getopt string
+#define OPTIONS "Aa:c:C:f:hi:k:K:l:o:p:t:v" // getopt string
 #define DEFAULT_CONFIG_FILE "/usr/local/etc/owlps/owlps-aggregator.conf"
 #define DEFAULT_AGGREGATE_TIMEOUT 1500 // milliseconds
 #define DEFAULT_KEEP_TIMEOUT 3000 // milliseconds
diff --git a/infrastructure-centred/owlps-aggregator/owlps-aggregatord.c b/infrastructure-centred/owlps-aggregator/owlps-aggregatord.c
index 4984355..c3d0c1c 100644
--- a/infrastructure-centred/owlps-aggregator/owlps-aggregatord.c
+++ b/infrastructure-centred/owlps-aggregator/owlps-aggregatord.c
@@ -88,6 +88,10 @@ void parse_config_file(int argc, char **argv)
   // Config file options for confuse
   cfg_opt_t opts[] =
     {
+      // Be verbose?
+      CFG_BOOL("verbose", cfg_false, CFGF_NONE),
+
+      // Aggregation listening port
       CFG_INT("listening_port", AGGREGATE_DEFAULT_PORT, CFGF_NONE),
 
       // Port and IP address of the localisation server:
@@ -204,6 +208,9 @@ void parse_command_line(int argc, char **argv)
 	case 't' :
 	  cfg_setint(cfg, "aggregate_timeout", strtol(optarg, NULL, 0)) ;
 	  break ;
+        case 'v' :
+          cfg_setbool(cfg, "verbose", cfg_true) ;
+          break ;
 	default :
 	  print_usage() ;
 	  exit(ERR_BAD_USAGE) ;
@@ -313,39 +320,53 @@ int read_loop(int sockfd)
 	    }
 	  break ;
 	}
-      ap_mac_string =
-        mac_bytes_to_string(message.ap_mac_addr_bytes) ;
-      mobile_mac_string =
-        mac_bytes_to_string(message.mobile_mac_addr_bytes) ;
-      mobile_ip_string =
-        ip_bytes_to_string(message.mobile_ip_addr_bytes) ;
-      printf("\n"
-             "*** Message received from client ***\n"
-             "\tAP MAC: %s\n"
-             "\tMobile MAC: %s\n"
-             "\tMobile IP: %s\n"
-             "\tSequence number (request timestamp): %llu\n"
-             "\tRequest arrival time on the AP: %llu\n"
-             "\tSignal: %d dBm\n"
-             "\tPosition X: %f\n"
-             "\tPosition Y: %f\n"
-             "\tPosition Z: %f\n"
-             "\tDirection: %hhd\n"
-             ,
-	     ap_mac_string,
-	     mobile_mac_string,
-             mobile_ip_string,
-	     timeval_to_ms(message.request_time),
-	     timeval_to_ms(message.start_time),
-	     message.antenna_signal_dbm - 0x100,
-	     message.x_position,
-	     message.y_position,
-	     message.z_position,
-	     message.direction
-	     ) ;
-      free(ap_mac_string) ;
-      free(mobile_mac_string) ;
-      free(mobile_ip_string) ;
+
+      if (cfg_getbool(cfg, "verbose"))
+        {
+          ap_mac_string =
+            mac_bytes_to_string(message.ap_mac_addr_bytes) ;
+          mobile_mac_string =
+            mac_bytes_to_string(message.mobile_mac_addr_bytes) ;
+          mobile_ip_string =
+            ip_bytes_to_string(message.mobile_ip_addr_bytes) ;
+          printf("\n"
+                 "*** Request received from AP ***\n"
+                 "\tAP MAC: %s\n"
+                 "\tMobile MAC: %s\n"
+                 "\tMobile IP: %s\n"
+                 "\tSequence number (request timestamp): %llu\n"
+                 "\tRequest arrival time on the AP: %llu\n"
+                 "\tSignal: %d dBm\n"
+                 "\tPosition X: %f\n"
+                 "\tPosition Y: %f\n"
+                 "\tPosition Z: %f\n"
+                 "\tDirection: %hhd\n"
+                 ,
+                 ap_mac_string,
+                 mobile_mac_string,
+                 mobile_ip_string,
+                 timeval_to_ms(message.request_time),
+                 timeval_to_ms(message.start_time),
+                 message.antenna_signal_dbm - 0x100,
+                 message.x_position,
+                 message.y_position,
+                 message.z_position,
+                 message.direction
+                 ) ;
+          free(ap_mac_string) ;
+          free(mobile_mac_string) ;
+          free(mobile_ip_string) ;
+        }
+#ifdef DEBUG
+      else
+        {
+          ap_mac_string =
+            mac_bytes_to_string(message.ap_mac_addr_bytes) ;
+          fprintf(stderr, "Request received from AP « %s ».\n",
+                  ap_mac_string) ;
+          free(ap_mac_string) ;
+        }
+#endif // DEBUG
 
       got_couple_info(message) ;
     }
@@ -1062,16 +1083,28 @@ char* ip_bytes_to_string(unsigned char *ip_binary)
 void print_usage()
 {
   printf("Usage:\n"
-         "\t%s [-f config_file] [-l listening_port] [-i positionner_ip]"
-         " [-p positioner_port] [-t aggregate_timeout] [-k keep_timeout]"
-         " [-c check_interval] [-o output_file] [-A]"
-         " [-a autocalibration_port] [-K ap_keep_timeout]"
-         " [-C ap_check_interval]\n"
+         "\t%s"
+         " [-f config_file]"
+         " [-v]"
+         " [-l listening_port]"
+         " [-i positionner_ip]"
+         " [-p positioner_port]"
+         " [-t aggregate_timeout]"
+         " [-k keep_timeout]"
+         " [-c check_interval]"
+         " [-o output_file]"
+         " [-A]"
+         " [-a autocalibration_port]"
+         " [-K ap_keep_timeout]"
+         " [-C ap_check_interval]"
+         "\n"
 
          "Main options:\n"
          "\t-h\t\tPrint this help.\n"
          "\t-f config_file\tUse 'config_file' instead of the default"
          " configuration file.\n"
+         "\t-v\t\tBe verbose (print detailed info on each received"
+         " message).\n"
 
          "Server options:\n"
          "\t-l listening_port\tOnly requests sent on this port will be"