Update mbed-coap to version 5.0.0

- Reduce heap footprint by storing only single block when receiving a blockwise message.
    * User is now responsible of freeing the data by calling sn_coap_protocol_block_remove() and must not free the payload separately.
- Bug fix: Request blockwise transfer if incoming payload length is too large and when it comes without block indication.

Author: Antti Yli-Tokola

features/frameworks/mbed-coap/CHANGELOG.md

@@ -1,6 +1,14 @@
 # Change Log
 
-## [v4.8.1(https://github.com/ARMmbed/mbed-coap/releases/tag/v4.8.1)
+## [v5.0.0](https://github.com/ARMmbed/mbed-coap/releases/tag/v5.0.0)
+
+- Reduce heap footprint by storing only single block when receiving a blockwise message.
+    * User is now responsible of freeing the data by calling sn_coap_protocol_block_remove() and must not free the payload separately.
+- Bug fix: Request blockwise transfer if incoming payload length is too large and when it comes without block indication. 
+
+-[Full Changelog](https://github.com/ARMmbed/mbed-coap/compare/v4.8.1...v5.0.0)
+
+## [v4.8.1](https://github.com/ARMmbed/mbed-coap/releases/tag/v4.8.1)
 - Store ACK's also into duplicate info list.
 - ROM size optimization. Flash size has gone down ~1100 bytes.
 

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

@@ -157,7 +157,7 @@ typedef enum sn_coap_status_ {
     COAP_STATUS_PARSER_BLOCKWISE_ACK           = 4, /**< Acknowledgement for sent Blockwise message received */
     COAP_STATUS_PARSER_BLOCKWISE_MSG_REJECTED  = 5, /**< Blockwise message received but not supported by compiling switch */
     COAP_STATUS_PARSER_BLOCKWISE_MSG_RECEIVED  = 6, /**< Blockwise message fully received and returned to app.
-                                                         User must take care of releasing whole payload of the blockwise messages */
+                                                         User is responsible of freeing the data by calling sn_coap_protocol_block_remove() */
     COAP_STATUS_BUILDER_MESSAGE_SENDING_FAILED = 7, /**< When re-transmissions have been done and ACK not received, CoAP library calls
                                                          RX callback with this status */
 

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

@@ -97,6 +97,7 @@ typedef struct coap_blockwise_payload_ {
 
     uint16_t            payload_len;
     uint8_t             *payload_ptr;
+    unsigned int        use_size1:1;
 
     ns_list_link_t     link;
 } coap_blockwise_payload_s;