diff --git a/libowlps-client/libowlps-client.c b/libowlps-client/libowlps-client.c
index 0c0ef81..a1cb93f 100644
--- a/libowlps-client/libowlps-client.c
+++ b/libowlps-client/libowlps-client.c
@@ -103,25 +103,27 @@ void owl_use_iface(const int sockfd, const char *const iface)
  * @param[in] packet_size The buffer's size.
  * @param[in] nb_pkt Number of packets to transmit.
  * @param[in] delay Delay between two transmissions, in milliseconds.
+ * @param[in] verbose If `true`, a "progress bar" will be printed on the
+ * standard output.
  */
 void owl_send_request(const int sockfd,
                       const struct sockaddr_in *const server,
                       const void *const packet,
                       const uint_fast16_t packet_size,
                       const uint_fast16_t nb_pkt,
-                      const uint_fast32_t delay)
+                      const uint_fast32_t delay,
+                      const bool verbose)
 {
   uint_fast16_t i ;
 
   if (nb_pkt == 0 || !owl_run)
     return ;
 
-#ifdef OWLPS_DEBUG
-  printf("Sent packets: ") ;
-#endif // OWLPS_DEBUG
+  if (verbose)
+    printf("Sent packets: ") ;
 
   // Transmit first packet:
-  owl_send_packet(sockfd, server, packet, packet_size) ;
+  owl_send_packet(sockfd, server, packet, packet_size, verbose) ;
 
   // Transmit remaining packets (if any):
   for (i = 1 ; i < nb_pkt ; ++i)
@@ -132,12 +134,11 @@ void owl_send_request(const int sockfd,
         break ;
       // Update the packet number:
       memcpy(&((char*) packet)[1], &current_pkt, sizeof(uint16_t)) ;
-      owl_send_packet(sockfd, server, packet, packet_size) ;
+      owl_send_packet(sockfd, server, packet, packet_size, verbose) ;
     }
 
-#ifdef OWLPS_DEBUG
-  putchar('\n') ;
-#endif // OWLPS_DEBUG
+  if (verbose)
+    putchar('\n') ;
 }
 
 
@@ -146,11 +147,14 @@ void owl_send_request(const int sockfd,
  * Transmits a single packet of a request.
  * See the documentation of the `owl_send_request()` function for an
  * explanation on the parameters.
+ * When `verbose` if `true`, a dot will be printed on the standard output
+ * and the standard output will be flushed.
  */
 void owl_send_packet(const int sockfd,
                      const struct sockaddr_in *const server,
                      const void *const packet,
-                     const uint_fast16_t packet_size)
+                     const uint_fast16_t packet_size,
+                     const bool verbose)
 {
   ssize_t nsent = sendto(sockfd, packet, packet_size, 0,
                          (struct sockaddr *) server,
@@ -161,8 +165,9 @@ void owl_send_packet(const int sockfd,
       exit(OWL_ERR_SOCKET_SEND) ;
     }
 
-#ifdef OWLPS_DEBUG
-  putchar('.') ;
-  fflush(stdout) ;
-#endif // OWLPS_DEBUG
+  if (verbose)
+    {
+      putchar('.') ;
+      fflush(stdout) ;
+    }
 }
diff --git a/libowlps-client/owlps-client.h b/libowlps-client/owlps-client.h
index 01dbd53..b1cf8fc 100644
--- a/libowlps-client/owlps-client.h
+++ b/libowlps-client/owlps-client.h
@@ -40,11 +40,13 @@ void owl_send_request(const int sockfd,
                       const void *const packet,
                       const uint_fast16_t packet_size,
                       const uint_fast16_t nb_pkt,
-                      const uint_fast32_t delay) ;
+                      const uint_fast32_t delay,
+                      const bool verbose) ;
 void owl_send_packet(const int sockfd,
                      const struct sockaddr_in *const server,
                      const void *const packet,
-                     const uint_fast16_t packet_size) ;
+                     const uint_fast16_t packet_size,
+                     const bool verbose) ;
 
 
 #endif // _LIBOWLPS_CLIENT_
diff --git a/owlps-client/owlps-client.c b/owlps-client/owlps-client.c
index 3d0c66a..ea139ce 100644
--- a/owlps-client/owlps-client.c
+++ b/owlps-client/owlps-client.c
@@ -473,7 +473,7 @@ void send_request()
 {
   make_packet() ;
   owl_send_request(sockfd, &server, packet, packet_size,
-                   options.nb_pkt, options.delay) ;
+                   options.nb_pkt, options.delay, options.verbose) ;
   free(packet) ;
 }
 
diff --git a/owlps-listener/owlps-listenerd.c b/owlps-listener/owlps-listenerd.c
index 3c3a8ae..33a767d 100644
--- a/owlps-listener/owlps-listenerd.c
+++ b/owlps-listener/owlps-listenerd.c
@@ -1424,7 +1424,7 @@ void* autocalibrate_hello(void *NULL_value)
   while (owl_run)
     {
       owl_send_packet(send_sockfd, &serv,
-                      &message, sizeof(message)) ;
+                      &message, sizeof(message), VERBOSE_INFO) ;
       sleep(GET_AUTOCALIBRATION_HELLO_DELAY()) ;
     }
 
@@ -1506,7 +1506,8 @@ void send_autocalibration_request()
                    &autocalibration_send_server,
                    packet, packet_size,
                    GET_AUTOCALIBRATION_NBPKT(),
-                   GET_AUTOCALIBRATION_DELAY()) ;
+                   GET_AUTOCALIBRATION_DELAY(),
+                   VERBOSE_INFO) ;
 
   free(packet) ;
 }