A lightweight & stable cross-platform support library with a focus on asynchronous socket I/O, support win32 & linux & apple & android & wp8 & wp8.1-universal & win10-universal
The core design is reference from https://github.com/chriskohlhoff/asio but very small.
This lib has been used by project http://hongjing.qq.com/ and run at millions of devices.

• support IPv6-only network.
• support multi-connections at one thread.
• support deadline timer.
• processing tcp sticky internal, user do not need to care it.
• support lua bindings
• support cocos2d-x jsb
• support CocosCreator jsb2.0
• support Unity3D tolua

1. Only compile yasio\xxsocket.cpp with your project; For gcc, you must add --std=c++11 compile flag
   
2. demo code:

#include "xxsocket.h"
using namespace purelib::inet;
void test_connect() 
{
   xxsocket clientsock;
   // The interface xpconnect_n will detect whether localhost is IPV6 only network automatically
   // and connect the ipv4 server by V4MAPPED address.
   if(0 == clientsock.xpconnect_n("www.baidu.com", 443, std::chrono::seconds(5)/* connect timeout 5 seconds */))
   {
       printf("connect succeed\n");
   }
}

Compile yasio\xxsocket.cpp yasio\yasio.cpp with your project
cpptest: https://github.com/halx99/yasio/blob/master/msvc/cpptest/cpptest.cpp

1. Compile yasio\xxsocket.cpp yasio\yasio.cpp yasio\ibstream.cpp yasio\obstream.cpp yasio\impl\lyasio.cpp with your project
2. call luaopen_yasio after LUA VM initialized.
   luatest(windows user): open https://github.com/halx99/yasio/blob/master/msvc/luatest/luatest.xsxproj by x-studio365 IDE

1. Copy the folder yasio to cocos2d-x engine's folder external, yasio as sub directory of external

2. Add yasio\xxsocket.cpp yasio\yasio.cpp yasio\ibstream.cpp yasio\obstream.cpp yasio\impl\lyasio.cpp yasio\impl\yasio_cclua.cpp to compile with your solution.

Add yasio to your application Android.mk files, such as:

LOCAL_STATIC_LIBRARIES += yasio_static
$(call import-module, external/yasio/build/android-lua)

Add yasio\xxsocket.cpp yasio\yasio.cpp yasio\ibstream.cpp yasio\obstream.cpp yasio\impl\lyasio.cpp yasio\impl\yasio_cclua.cpp to libluacocos2d project of your Visual Studio or xcode solution.

3. Call luaopen_yasio_cclua(L) at your AppDelegate.cpp, please remember #include "yasio/yasio_cclua.h" firstly.

1. Copy all sources to your Classes\yasio and compile obstream.cpp, ibstream.cpp, xxsocket.cpp, yasio.cpp, impl/yasio_jsb.cpp with your native project
2. Add register code to your AppDelegate.cpp: sc->addRegisterCallback(jsb_register_yasio);, please include yasio_jsb.h firstly.

Add yasio to your application Android.mk files, such as:

LOCAL_STATIC_LIBRARIES += yasio_static
$(call import-module, external/yasio/build/android-jsb)

1. Copy all sources to your Classes\yasio and compile obstream.cpp, ibstream.cpp, xxsocket.cpp, yasio.cpp, impl/yasio_jsb20.cpp with your native project
2. Add register code to your jsb_module_register.cpp: se->addRegisterCallback(jsb_register_yasio); , please include yasio_jsb20.h firstly.

see: https://github.com/halx99/yasio/blob/master/msvc/jstest/example.js
showcase:

g++ yasio/xxsocket.cpp yasio/yasio.cpp yasio/ibstream.cpp yasio/obstream.cpp msvc/cpptest/cpptest.cpp --std=c++11 -lpthread -I./ -o cpptest && ./cpptest

1. For Microsoft Visual Studio, if your project has specific precompiled header, you should include it at head of xxsocket.cpp or specific the compile option: C/C++ --> Advance -->'Forced Include File' to it(such as pch.h).
2. For Microsoft Visual Studio 2019 preview3 MSVC C++17, you must set compile option: C/C++ --> Language --> Conformance mode to No, otherwise, you will got compiling error: sol.hpp(8060): error C3779: 'sol::stack::get': a function that returns 'decltype(auto)' cannot be used before it is defined

see: https://github.com/halx99/LuaFramework_UGUI
showcase:

The core objects: service, channel, transport

service: event-loop, manage channel, transport, peek events
channel: manage connection session
transport: response for data transition

client: per channel, per transport
server: per channel, multi transports

call service open:
open a channel as client, the channel will try connect remote host
open a channel as server, the channel will start listening

events: connect response, connection lost, a packet received.