Preparation for Release 4.2.0

[slaff]

This issue is created to collect all the tasks we need to do before the 4.2.0 release.

Source Code

• Update Sming/Core/SmingVersion.h. (Preparation for release 4.2.0 LTS. #2187)
• Update Readme.md.
• Merge develop into master.
• Tag the source code in the master branch.
• Add upgrade document 4.1 to 4.2 in the upgrade index.

!! Important !!!

• Since this version GCC compiler version 8 or newer is highly recommended. GCC compilers version 8 or newer are highly recommended. #2155 Fix to the GCC version comparison. #2172

New features

• Initial support for ESP32 Feature: Initial support for Esp32 #2076 Further work to Esp32 arch. #2151
• UPnP framework UPnP framework #2115
• UPnP code generation UPnP code generation #2154
• CS5460 Arduino library CS5460 Arduino library #2106, CS5460 library updates #2174
• Support command line parameters for Host applications Support command line parameters for Host applications #2134
• Added CString class Add CString class #2112
• Add BitSet class template UPnP framework #2115 & BitSet enhancements #2131
• Core Task class to support co-operative multitasking Core Task class to support co-operative multitasking #2148
• Hardware SPI library Hardware SPI library #2150
• DIAL client Updated DIAL client Library. #2152 (Using UPnP )
• Sample demonstrating connecting to Amazon Web Services Connecting to Amazon Web Services #2149

Improvements

• Revisions to SPI classes Revisions to SPI classes #2130
• Updated Infrared library and sample Update/ir lib #2083
• Stream optimisations Stream optimisations #2123
• Applied String move semantics to reduce memory re-allocations Apply String move semantics to reduce memory re-allocations #2119
• Refactored FTP classes Refactor FTP classes #2125
• Websocket: Added pong delegate support for websocket connection and resource Add pong delegate support for websoket connection and resource #2156
• MqttClient revisions MqttClient revisions #2157
• HttpClient improvements.
  • Added support for servers that do not support connection reuse. HttpClient improvements. Added support for servers that do not support connection reuse. #2132, HTTP client fixes #2163, Improve connection:close handling for HTTP clients. #2175
  • SSL sample changes: HttpClient: SSL adjustments #2173
• Added Esp32 gdbstub Component and fix Esp8266 syscall errno handling Add Esp32 gdbstub Component and fix Esp8266 syscall errno handling #2169
• Add iterator support for HashMap and Vector, with basic tests Add iterator support for HashMap and Vector, with basic tests #2167
• Templates engine improvements: Added dataset templating support Add dataset templating support #2164
• LimitedMemoryStream: Allocates memory buffer on demand and not upfront. Allocate LimitedMemoryStream buffer on demand and not upfront. #2153

Bug fixes

• Fixed appveyor crashing issue and use latest MinGW Fix appveyor crashing issue and use latest MinGW #2124

Security

• Added workaround for CVE-2020-12638 Added workaround for CVE-2020-12638. See https://lbsfilm.at/blog/wpa2… #2107

All PRs scheduled for this release can be seen from here