diff --git a/examples/coap-client.c b/examples/coap-client.c
index c8ad16ee..b119c93e 100644
--- a/examples/coap-client.c
+++ b/examples/coap-client.c
@@ -358,6 +358,7 @@ event_handler(coap_session_t *session COAP_UNUSED,
   case COAP_EVENT_SERVER_SESSION_NEW:
   case COAP_EVENT_SERVER_SESSION_DEL:
   case COAP_EVENT_BAD_PACKET:
+  case COAP_EVENT_MSG_RETRANSMITTED:
   default:
     break;
   }
diff --git a/examples/coap-server.c b/examples/coap-server.c
index 60f8602f..d184247f 100644
--- a/examples/coap-server.c
+++ b/examples/coap-server.c
@@ -1582,6 +1582,7 @@ proxy_event_handler(coap_session_t *session,
   case COAP_EVENT_SERVER_SESSION_NEW:
   case COAP_EVENT_SERVER_SESSION_DEL:
   case COAP_EVENT_BAD_PACKET:
+  case COAP_EVENT_MSG_RETRANSMITTED:
   default:
     break;
   }
diff --git a/include/coap3/coap_event.h b/include/coap3/coap_event.h
index bda21ef5..a773f5fa 100644
--- a/include/coap3/coap_event.h
+++ b/include/coap3/coap_event.h
@@ -94,10 +94,12 @@ typedef enum {
   COAP_EVENT_SERVER_SESSION_DEL = 0x4002,
 
 /*
- * Received packet formatting errors
+ * Message receive and transmit events
  */
   /** Triggered when badly formatted packet received */
-  COAP_EVENT_BAD_PACKET         = 0x5001
+  COAP_EVENT_BAD_PACKET         = 0x5001,
+  /** Triggered when a message is retransmitted */
+  COAP_EVENT_MSG_RETRANSMITTED  = 0x5002
 
 } coap_event_t;
 
diff --git a/man/coap_handler.txt.in b/man/coap_handler.txt.in
index 200842ff..a610da64 100644
--- a/man/coap_handler.txt.in
+++ b/man/coap_handler.txt.in
@@ -219,9 +219,10 @@ COAP_EVENT_XMIT_BLOCK_FAIL    0x3002
 COAP_EVENT_SERVER_SESSION_NEW 0x4001
 COAP_EVENT_SERVER_SESSION_DEL 0x4002
 /**
- * Unrecognizable received packet events
+ * Message receive and transmit events
  */
 COAP_EVENT_BAD_PACKET         0x5001
+COAP_EVENT_MSG_RETRANSMITTED  0x5002
 ----
 
 EXAMPLES
diff --git a/src/net.c b/src/net.c
index a191139d..5e00cc4a 100644
--- a/src/net.c
+++ b/src/net.c
@@ -1439,6 +1439,8 @@ coap_retransmit(coap_context_t *context, coap_queue_t *node) {
     coap_tick_t now;
 
     node->retransmit_cnt++;
+    coap_handle_event(context, COAP_EVENT_MSG_RETRANSMITTED, node->session);
+
     coap_ticks(&now);
     if (context->sendqueue == NULL) {
       node->t = node->timeout << node->retransmit_cnt;