V4.0.0

Changes between FreeRTOS-plus-TCP V4.0.0 released on August 14, 2023 and V3.1.0 :

• Unified code for both IPv4 and IPv6 protocols.
• Multiple Interface and Multiple Endpoint support
  1. The stack supports multiple Physical Interfaces.
  2. The stack also supports multiple endpoints (or Virtual interfaces) on the same physical interface.
• New WinSim demo to support IPv4, IPv6 and multi-interface together.
• Build separation feature introduced to achieve low memory footprint. Supported build combinations:
  1. IPv4 + UDP
  2. IPv4 + UDP + TCP
  3. IPv6 + UDP
  4. IPv6 + UDP + TCP
  5. IPv4 + IPv6 + UDP
  6. IPv4 + IPv6 + UDP + TCP
• Support added in FreeRTOS-plus-TCP git repository CI tool to validate various build configurations before PR merge.
• Achieved 100% unit test coverage for both IPv4 and IPv6.
• MISRA c-2012 compliance for both IPv4 and IPv6.
• Addressed several issues observed by Maxwell Protocol tester.
• Memory safety proofs for IPv6 code using CBMC automated reasoning tool.
• Stack is Penetration tested and a memory leak issue has been identified and fixed in the process.
  (Reference: #973)
• Improved Documentation:
  1. Multi-interface and Multi-endpoint documentation.
  2. Updated stack initialization documentation to support multi-interface and endpoint.
  3. Code size details for various build configurations
  4. Documentation added for IPv6 protocol support.
  5. Documentation added for various IPv6 functionalities like DHCPv6, ND (Neighbour Discovery), RA (Router Advertisement).
  6. README added for the network ports.

We thank the following people for their inputs in these enhancements:

• Add mDNS fixes for IPv6. Contributed by @evpopov.
• IP offset calculation improvement. Contributed by @evpopov.
• CCS compiler fix for packed structs. Contributed by @rahul-arasikere.
• Add tasking compiler support. Contributed by @go2sh.
• Add NetworkDown notification support to STM32FXX. Contributed by @zipperowiec.
• CMake changes. Contributed by @phelter.
• STM32Hxx porting fixes. Contributed by @miguelfreitas.
• Allow use of loopback addresses. Contributed by @adam-stamand.
• CBMC proof-running GitHub Action. Contributed by @karkhaz.
• CBMC XML output to enable VSCode debugger. Contributed by @karkhaz.
• vTaskDelay for sleep in the network-interface of xilinx_ultrascale.Contributed by @ChristosZosi.
• Read mac address using FreeRTOS_GetMACAddress(). Contributed by @sayyadumar.
• Minor warning fixes. Contributed by @ChristosZosi.
• Network-interface fix for Xilinx UltraScale port. Contributed by @ChristosZosi.