Update mbed-coap to version 4.4.1

- Fixes error: IOTCLT-2539 Block wise messaging call-backs not working logically
- Allow TCP+TLS transport method to send larger messages without blockwising.

NOTE! These are internal changes required for cloud client. This has no direct relevance to any mbed-os functionality.

Author: Antti Yli-Tokola

features/FEATURE_COMMON_PAL/mbed-coap/CHANGELOG.md

@@ -1,5 +1,13 @@
 # Change Log
 
+## [v4.4.1](https://github.com/ARMmbed/mbed-coap/releases/tag/v4.4.1) 
+**Closed issues:**
+ - IOTCLT-2539 Block wise messaging call-backs not working logically
+
+ Improve TCP+TLS transport layer to allow send larger messages without blockwising.
+
+-[Full Changelog](https://github.com/ARMmbed/mbed-coap/compare/v4.4.0...v4.4.1)
+
 ## [v4.4.0](https://github.com/ARMmbed/mbed-coap/releases/tag/v4.4.0) 
 **New feature:**
 - Make sn_coap_protocol_send_rst as public needed for CoAP ping sending

features/FEATURE_COMMON_PAL/mbed-coap/mbed-coap/sn_config.h

@@ -92,6 +92,21 @@
  */
 #undef SN_COAP_MAX_INCOMING_MESSAGE_SIZE    /* UINT16_MAX */
 
+/**
+ * \def SN_COAP_MAX_NONBLOCKWISE_PAYLOAD_SIZE
+ * \brief Sets the maximum payload size allowed before blockwising the message.
+ * This option should only be used when using TCP and TLS as transport
+ * with known maximum fragment size. This optimizes the number of messages
+ * if it is possible to send larger than 1kB messages without blockwise transfer.
+ * If payload length is larger than SN_COAP_MAX_NONBLOCKWISE_PAYLOAD_SIZE
+ * it will be sent using blockwise transfer.
+ * By default, this feature is disabled, 0 disables the feature, set to positive
+ * value larger than SN_COAP_MAX_BLOCKWISE_PAYLOAD_SIZE to enable.
+ * Note that value should be less than transport layer maximum fragment size.
+ * Note that value has no effect if blockwise transfer is disabled.
+ */
+#undef SN_COAP_MAX_NONBLOCKWISE_PAYLOAD_SIZE        /* 0 */
+
 #ifdef MBED_CLIENT_USER_CONFIG_FILE
 #include MBED_CLIENT_USER_CONFIG_FILE
 #endif

features/FEATURE_COMMON_PAL/mbed-coap/module.json

@@ -1,6 +1,6 @@
 {
   "name": "mbed-coap",
-  "version": "4.4.0",
+  "version": "4.4.1",
   "description": "COAP library",
   "keywords": [
     "coap",

features/FEATURE_COMMON_PAL/mbed-coap/source/include/sn_coap_protocol_internal.h

@@ -117,6 +117,10 @@ struct sn_coap_hdr_;
 #define SN_COAP_MAX_BLOCKWISE_PAYLOAD_SIZE          0  /**< Must be 2^x and x is at least 4. Suitable values: 0, 16, 32, 64, 128, 256, 512 and 1024 */
 #endif
 
+#ifndef SN_COAP_MAX_NONBLOCKWISE_PAYLOAD_SIZE
+#define SN_COAP_MAX_NONBLOCKWISE_PAYLOAD_SIZE       0
+#endif
+
 #ifdef MBED_CONF_MBED_CLIENT_SN_COAP_BLOCKWISE_MAX_TIME_DATA_STORED
 #define SN_COAP_BLOCKWISE_MAX_TIME_DATA_STORED MBED_CONF_MBED_CLIENT_SN_COAP_BLOCKWISE_MAX_TIME_DATA_STORED
 #endif

features/FEATURE_COMMON_PAL/mbed-coap/source/sn_coap_builder.c

@@ -341,7 +341,9 @@ uint16_t sn_coap_builder_calc_needed_packet_data_size_2(sn_coap_hdr_s *src_coap_
             }
         }
 #if SN_COAP_MAX_BLOCKWISE_PAYLOAD_SIZE
-        if ((src_coap_msg_ptr->payload_len > blockwise_payload_size) && (blockwise_payload_size > 0)) {
+        if ((src_coap_msg_ptr->payload_len > SN_COAP_MAX_NONBLOCKWISE_PAYLOAD_SIZE) &&
+            (src_coap_msg_ptr->payload_len > blockwise_payload_size) &&
+            (blockwise_payload_size > 0)) {
             returned_byte_count += blockwise_payload_size;
         } else {
             returned_byte_count += src_coap_msg_ptr->payload_len;

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

@@ -372,7 +372,9 @@ int8_t sn_coap_protocol_delete_retransmission(struct coap_s *handle, uint16_t ms
 #if SN_COAP_MAX_BLOCKWISE_PAYLOAD_SIZE /* If Message blockwising is not used at all, this part of code will not be compiled */
 int8_t prepare_blockwise_message(struct coap_s *handle, sn_coap_hdr_s *src_coap_msg_ptr)
 {
-    if ((src_coap_msg_ptr->payload_len > handle->sn_coap_block_data_size) && (handle->sn_coap_block_data_size > 0)) {
+    if ((src_coap_msg_ptr->payload_len > SN_COAP_MAX_NONBLOCKWISE_PAYLOAD_SIZE) &&
+        (src_coap_msg_ptr->payload_len > handle->sn_coap_block_data_size) &&
+        (handle->sn_coap_block_data_size > 0)) {
         /* * * * Add Blockwise option to send CoAP message * * */
 
         /* Allocate memory for less used options */
@@ -436,15 +438,15 @@ int16_t sn_coap_protocol_build(struct coap_s *handle, sn_nsdl_addr_s *dst_addr_p
     }
 
 #if SN_COAP_MAX_BLOCKWISE_PAYLOAD_SIZE /* If Message blockwising is not used at all, this part of code will not be compiled */
-
     /* If blockwising needed */
-    if ((src_coap_msg_ptr->payload_len > handle->sn_coap_block_data_size) && (handle->sn_coap_block_data_size > 0)) {
+    if ((src_coap_msg_ptr->payload_len > SN_COAP_MAX_NONBLOCKWISE_PAYLOAD_SIZE) &&
+        (src_coap_msg_ptr->payload_len > handle->sn_coap_block_data_size) &&
+        (handle->sn_coap_block_data_size > 0)) {
         /* Store original Payload length */
         original_payload_len = src_coap_msg_ptr->payload_len;
         /* Change Payload length of send message because Payload is blockwised */
         src_coap_msg_ptr->payload_len = handle->sn_coap_block_data_size;
     }
-
 #endif
     /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
     /* * * * Build Packet data from CoAP message by using CoAP Header builder  * * * */
@@ -1264,6 +1266,15 @@ static void sn_coap_protocol_linked_list_blockwise_payload_store(struct coap_s *
         return;
     }
 
+    // Do not add duplicates to list, this could happen if server needs to retransmit block message again
+    ns_list_foreach(coap_blockwise_payload_s, payload_info_ptr, &handle->linked_list_blockwise_received_payloads) {
+        if (0 == memcmp(addr_ptr->addr_ptr, payload_info_ptr->addr_ptr, addr_ptr->addr_len)) {
+            if (payload_info_ptr->port == addr_ptr->port && payload_info_ptr->block_number == block_number) {
+                return;
+            }
+        }
+    }
+
     coap_blockwise_payload_s *stored_blockwise_payload_ptr = NULL;
 
     /* * * * Allocating memory for stored Payload  * * * */