Update mbed-coap to version 4.6.0

* Added new API which clears one item from the resend queue by token

features/frameworks/mbed-coap/CHANGELOG.md

@@ -1,5 +1,11 @@
 # Change Log
 
+## [v4.6.0](https://github.com/ARMmbed/mbed-coap/releases/tag/v4.6.0) 
+**New feature:**
+-  Add new API which clears one item from the resend queue based on token
+
+-[Full Changelog](https://github.com/ARMmbed/mbed-coap/compare/v4.5.1...v4.6.0)
+
 ## [v4.5.1](https://github.com/ARMmbed/mbed-coap/releases/tag/v4.5.1) 
 **Closed issues:**
  - IOTCLT-2883 - Blockwise observations not completing

features/frameworks/mbed-coap/mbed-coap/sn_coap_protocol.h

@@ -224,6 +224,18 @@ extern void sn_coap_protocol_remove_sent_blockwise_message(struct coap_s *handle
  */
 extern int8_t sn_coap_protocol_delete_retransmission(struct coap_s *handle, uint16_t msg_id);
 
+/**
+ * \fn void sn_coap_protocol_delete_retransmission_by_token(struct coap_s *handle)
+ *
+ * \param *handle Pointer to CoAP library handle
+ * \token Token to be removed
+ * \token_len Length of the token
+ * \return returns 0 when success, -1 for invalid parameter, -2 if message was not found
+ *
+ * \brief If re-transmissions are enabled, this function removes message from retransmission buffer.
+ */
+extern int8_t sn_coap_protocol_delete_retransmission_by_token(struct coap_s *handle, uint8_t *token, uint8_t token_len);
+
 /**
  * \fn int8_t sn_coap_convert_block_size(uint16_t block_size)
  *

features/frameworks/mbed-coap/module.json

@@ -1,6 +1,6 @@
 {
   "name": "mbed-coap",
-  "version": "4.5.1",
+  "version": "4.6.0",
   "description": "COAP library",
   "keywords": [
     "coap",

features/frameworks/mbed-coap/source/sn_coap_protocol.c

@@ -363,6 +363,36 @@ int8_t sn_coap_protocol_delete_retransmission(struct coap_s *handle, uint16_t ms
     return -2;
 }
 
+int8_t sn_coap_protocol_delete_retransmission_by_token(struct coap_s *handle, uint8_t *token, uint8_t token_len)
+{
+#if ENABLE_RESENDINGS /* If Message resending is not used at all, this part of code will not be compiled */
+    if (handle == NULL || token == NULL || token_len == 0) {
+        tr_error("sn_coap_protocol_delete_retransmission_by_token NULL");
+        return -1;
+    }
+
+    ns_list_foreach(coap_send_msg_s, stored_msg, &handle->linked_list_resent_msgs) {
+        uint8_t stored_token_len =  (stored_msg->send_msg_ptr->packet_ptr[0] & 0x0F);
+        if (stored_token_len == token_len) {
+            uint8_t stored_token[8];
+            memcpy(stored_token, &stored_msg->send_msg_ptr->packet_ptr[4], stored_token_len);
+            if (memcmp(stored_token, token, stored_token_len) == 0) {
+                uint16_t temp_msg_id = (stored_msg->send_msg_ptr->packet_ptr[2] << 8);
+                temp_msg_id += (uint16_t)stored_msg->send_msg_ptr->packet_ptr[3];
+                tr_debug("sn_coap_protocol_delete_retransmission_by_token - removed msg_id: %d", temp_msg_id);
+                ns_list_remove(&handle->linked_list_resent_msgs, stored_msg);
+                --handle->count_resent_msgs;
+
+                /* Free memory of stored message */
+                sn_coap_protocol_release_allocated_send_msg_mem(handle, stored_msg);
+                return 0;
+            }
+        }
+    }
+#endif
+    return -2;
+}
+
 
 int8_t prepare_blockwise_message(struct coap_s *handle, sn_coap_hdr_s *src_coap_msg_ptr)
 {