The client is cocos2dx, the server is Java, quite a good example

cocos2dx socket\client\.cocos-project.json
...............\......\Classes\AppDelegate.cpp
...............\......\.......\AppDelegate.h
...............\......\.......\Custom\ProtoMessageDelegate.h
...............\......\.......\MessageSerializer\BinarySerializer.cpp
...............\......\.......\.................\BinarySerializer.h
...............\......\.......\.................\IMessageSerializer.h
...............\......\.......\Network\ODSocket.cpp
...............\......\.......\.......\ODSocket.h
...............\......\.......\.......\SocketResponseThread.cpp
...............\......\.......\.......\SocketResponseThread.h
...............\......\.......\.......\SocketResponseThreadDelegate.h
...............\......\.......\.......\SocketThread.cpp
...............\......\.......\.......\SocketThread.h
...............\......\.......\ProtoMessages\CommunicationMessageType.pb.cc
...............\......\.......\.............\CommunicationMessageType.pb.h
...............\......\.......\.............\MessageRequest.pb.cc
...............\......\.......\.............\MessageRequest.pb.h
...............\......\.......\.............\MessageRequestPing.pb.cc
...............\......\.......\.............\MessageRequestPing.pb.h
...............\......\.......\.............\MessageResponse.pb.cc
...............\......\.......\.............\MessageResponse.pb.h
...............\......\.......\.............\MessageResponsePong.pb.cc
...............\......\.......\.............\MessageResponsePong.pb.h
...............\......\.......\SceneSample.cpp
...............\......\.......\SceneSample.h
...............\......\CMakeLists.txt
...............\......\proj.android\.externalToolBuilders\org.eclipse.cdt.managedbuilder.core.genmakebuilder.launch
...............\......\............\AndroidManifest.xml
...............\......\............\ant.properties
...............\......\............\build-cfg.json
...............\......\............\build.xml
...............\......\............\build_native.py
...............\......\............\jni\Android.mk
...............\......\............\...\Application.mk
...............\......\............\...\brrcpp\main.cpp
...............\......\............\local.properties
...............\......\............\proguard-project.txt
...............\......\............\project.properties
...............\......\............\res\drawable-hdpi\icon.png
...............\......\............\...\.........ldpi\icon.png
...............\......\............\...\.........mdpi\icon.png
...............\......\............\...\values\strings.xml
...............\......\............\src\org\cocos2dx\cpp\AppActivity.java
...............\......\.....ios_mac\ios\AppController.h
...............\......\............\...\AppController.mm
...............\......\............\...\Default-568h@2x.png
...............\......\............\...\Default-667h@2x.png
...............\......\............\...\Default-736h@3x.png
...............\......\............\...\Default.png
...............\......\............\...\Default@2x.png
...............\......\............\...\Icon-100.png
...............\......\............\...\Icon-114.png
...............\......\............\...\Icon-120.png
...............\......\............\...\Icon-144.png
...............\......\............\...\Icon-152.png
...............\......\............\...\Icon-29.png
...............\......\............\...\Icon-40.png
...............\......\............\...\Icon-50.png
...............\......\............\...\Icon-57.png
...............\......\............\...\Icon-58.png
...............\......\............\...\Icon-72.png
...............\......\............\...\Icon-76.png
...............\......\............\...\Icon-80.png
...............\......\............\...\Info.plist
...............\......\............\...\main.m
...............\......\............\...\Prefix.pch
...............\......\............\...\RootViewController.h
...............\......\............\...\RootViewController.mm
...............\......\............\mac\Icon.icns
...............\......\........

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