diff --git a/.clang-format b/.clang-format
index 402f22e..36e4997 100644
--- a/.clang-format
+++ b/.clang-format
@@ -11,7 +11,7 @@ ReflowComments: true
 SpacesBeforeTrailingComments: 3
 TabWidth: 4
 ConstructorInitializerAllOnOneLineOrOnePerLine: true
-ColumnLimit: 80
+ColumnLimit: 130
 AllowShortBlocksOnASingleLine: Never
 AllowShortFunctionsOnASingleLine: None
 AllowShortEnumsOnASingleLine: false
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..f5e7bbc
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "ofen"]
+	path = ofen
+	url = https://www.sinxmiao.cn/taynpg/ofen
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 3399912..98a3287 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -31,5 +31,85 @@
         "ja": true,
         "zh-hant": true,
         "zh-hans": true
+    },
+    "files.associations": {
+        "memory": "cpp",
+        "xstring": "cpp",
+        "algorithm": "cpp",
+        "any": "cpp",
+        "array": "cpp",
+        "atomic": "cpp",
+        "bitset": "cpp",
+        "cctype": "cpp",
+        "charconv": "cpp",
+        "chrono": "cpp",
+        "clocale": "cpp",
+        "cmath": "cpp",
+        "codecvt": "cpp",
+        "complex": "cpp",
+        "condition_variable": "cpp",
+        "csignal": "cpp",
+        "cstdarg": "cpp",
+        "cstddef": "cpp",
+        "cstdint": "cpp",
+        "cstdio": "cpp",
+        "cstdlib": "cpp",
+        "cstring": "cpp",
+        "ctime": "cpp",
+        "cwchar": "cpp",
+        "deque": "cpp",
+        "exception": "cpp",
+        "filesystem": "cpp",
+        "fstream": "cpp",
+        "functional": "cpp",
+        "future": "cpp",
+        "initializer_list": "cpp",
+        "iomanip": "cpp",
+        "ios": "cpp",
+        "iosfwd": "cpp",
+        "iostream": "cpp",
+        "istream": "cpp",
+        "iterator": "cpp",
+        "limits": "cpp",
+        "list": "cpp",
+        "locale": "cpp",
+        "map": "cpp",
+        "mutex": "cpp",
+        "new": "cpp",
+        "optional": "cpp",
+        "ostream": "cpp",
+        "ratio": "cpp",
+        "shared_mutex": "cpp",
+        "sstream": "cpp",
+        "stdexcept": "cpp",
+        "streambuf": "cpp",
+        "string": "cpp",
+        "string_view": "cpp",
+        "system_error": "cpp",
+        "xthread": "cpp",
+        "thread": "cpp",
+        "tuple": "cpp",
+        "type_traits": "cpp",
+        "typeinfo": "cpp",
+        "unordered_map": "cpp",
+        "utility": "cpp",
+        "variant": "cpp",
+        "vector": "cpp",
+        "xfacet": "cpp",
+        "xhash": "cpp",
+        "xiosbase": "cpp",
+        "xlocale": "cpp",
+        "xlocbuf": "cpp",
+        "xlocinfo": "cpp",
+        "xlocmes": "cpp",
+        "xlocmon": "cpp",
+        "xlocnum": "cpp",
+        "xloctime": "cpp",
+        "xmemory": "cpp",
+        "xmemory0": "cpp",
+        "xstddef": "cpp",
+        "xtr1common": "cpp",
+        "xtree": "cpp",
+        "xutility": "cpp"
     }
 }
\ No newline at end of file
diff --git a/3rd/spdlog/fmt/bundled/base.h b/3rd/spdlog/fmt/bundled/base.h
index 6276494..ccf1955 100644
--- a/3rd/spdlog/fmt/bundled/base.h
+++ b/3rd/spdlog/fmt/bundled/base.h
@@ -288,7 +288,7 @@
 #endif
 
 #ifndef FMT_UNICODE
-#  define FMT_UNICODE 1
+#  define FMT_UNICODE 0
 #endif
 
 // Check if rtti is available.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index fa67d31..ff0af29 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,6 +4,7 @@ project(transm LANGUAGES CXX)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
+set(CMAKE_DEBUG_POSTFIX "d")
 message(STATUS "System: ${CMAKE_SYSTEM_NAME}")
 message(STATUS "Compiler CXX ID: ${CMAKE_CXX_COMPILER_ID}")
 
@@ -11,5 +12,12 @@ set(LIBRARY_OUTPUT_PATH ${PROJECT_BINARY_DIR}/lib/${CMAKE_BUILD_TYPE})
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/bin/${CMAKE_BUILD_TYPE}/) 
 
 include_directories(3rd)
+include_directories(.)
+add_subdirectory(ofen)
+add_subdirectory(net)
+add_subdirectory(util)
 add_subdirectory(server)
-add_subdirectory(client)
\ No newline at end of file
+add_subdirectory(client)
+
+add_executable(transm_test test.cpp)
+target_link_libraries(transm_test PRIVATE trans_net trans_util)
\ No newline at end of file
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e3115aa
--- /dev/null
+++ b/README.md
@@ -0,0 +1,9 @@
+# transm
+
+以一个网点作为中转传输文件。
+
+# 简要说明
+
+- `client`和`server`均为命令行端程序，无GUI。
+- `client`从`server`下载文件，如果本地有重复则覆盖。
+- 工作方式为`client A`端提交待传输的文件列表到`server`，`client B`端从`server`获取有哪些客户机提交的哪些任务，可以从中下载。
\ No newline at end of file
diff --git a/client/main.cpp b/client/main.cpp
index 74d43e4..1642d5e 100644
--- a/client/main.cpp
+++ b/client/main.cpp
@@ -1,8 +1,8 @@
 #include <iostream>
 
+
 int main()
 {
 
-
     return 0;
 }
\ No newline at end of file
diff --git a/main.cpp b/main.cpp
deleted file mode 100644
index 157fa26..0000000
--- a/main.cpp
+++ /dev/null
@@ -1,7 +0,0 @@
-#include <iostream>
-
-int main()
-{
-    std::cout << "Done" << std::endl;
-    return 0;
-}
\ No newline at end of file
diff --git a/net/CMakeLists.txt b/net/CMakeLists.txt
new file mode 100644
index 0000000..9f240de
--- /dev/null
+++ b/net/CMakeLists.txt
@@ -0,0 +1,15 @@
+cmake_minimum_required(VERSION 3.16)
+
+project(trans_net LANGUAGES CXX)
+
+if (MSVC)
+    add_definitions(-D_WIN32_WINNT=0x0601)
+    add_compile_options(/source-charset:utf-8)
+endif()
+
+set(SOURCES
+    net_base.h net_base.cpp
+)
+add_library(trans_net STATIC ${SOURCES})
+target_link_libraries(trans_net PUBLIC Ofen trans_util)
+target_include_directories(trans_net PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
\ No newline at end of file
diff --git a/net/net_base.cpp b/net/net_base.cpp
new file mode 100644
index 0000000..7d0c9ce
--- /dev/null
+++ b/net/net_base.cpp
@@ -0,0 +1,69 @@
+#include "net_base.h"
+
+CServer::CServer()
+{
+}
+
+CServer::~CServer()
+{
+}
+
+CClient::CClient(const std::shared_ptr<spdlog::logger>& logger) : logger_(logger), io_context_(), socket_(io_context_)
+{
+}
+
+CClient::~CClient()
+{
+}
+
+bool CClient::Connect(const std::string& host, const std::string& port)
+{
+    try {
+        asio::ip::tcp::resolver resolver(io_context_);
+        asio::ip::tcp::resolver::results_type endpoints = resolver.resolve(host, port);
+        asio::connect(socket_, endpoints);
+        logger_->info("Connected to {}:{}", host, port);
+        return true;
+    } catch (const std::exception& ex) {
+        logger_->error("Connection failed: {}", ex.what());
+        return false;
+    }
+}
+
+void CClient::Disconnect()
+{
+    if (socket_.is_open()) {
+        try {
+            socket_.close();
+            logger_->info("Disconnected.");
+        } catch (const std::exception& ex) {
+            logger_->error("Error during disconnection: {}", ex.what());
+        }
+    }
+}
+
+bool CClient::Send(const char* data, int len)
+{
+    try {
+        auto send_size = asio::write(socket_, asio::buffer(data, len));
+        logger_->info("Need Send len: {} Real Send len: {}", len, send_size);
+        return static_cast<int>(send_size) == len;
+    } catch (const std::exception& ex) {
+        logger_->error("Send failed: {}", ex.what());
+        return false;
+    }
+}
+
+std::string CClient::Receive()
+{
+    try {
+        std::vector<char> buffer(1024);
+        size_t length = socket_.read_some(asio::buffer(buffer));
+        std::string received_data(buffer.data(), length);
+        logger_->info("Received data len: {}", length);
+        return received_data;
+    } catch (const std::exception& ex) {
+        logger_->error("Receive failed: {}", ex.what());
+        return "";
+    }
+}
diff --git a/net/net_base.h b/net/net_base.h
new file mode 100644
index 0000000..e86a549
--- /dev/null
+++ b/net/net_base.h
@@ -0,0 +1,31 @@
+#pragma once
+
+#include "util.h"
+#include <asio.hpp>
+#include <of_util.h>
+
+using namespace ofen;
+class CServer
+{
+public:
+    CServer();
+    ~CServer();
+};
+
+class CClient
+{
+public:
+    CClient(const std::shared_ptr<spdlog::logger>& logger);
+    ~CClient();
+public:
+    bool Connect(const std::string& host, const std::string& port);
+    void Disconnect();
+    bool Send(const char* data, int len);
+    std::string Receive();
+
+private:
+    std::shared_ptr<spdlog::logger> logger_;
+    asio::io_context io_context_;
+    asio::ip::tcp::socket socket_;
+    CMutBuffer buffer_;
+};
\ No newline at end of file
diff --git a/ofen b/ofen
new file mode 160000
index 0000000..76c702c
--- /dev/null
+++ b/ofen
@@ -0,0 +1 @@
+Subproject commit 76c702cea8f4aa572d9c4319a5bb41d2ea969680
diff --git a/test.cpp b/test.cpp
new file mode 100644
index 0000000..841d4c4
--- /dev/null
+++ b/test.cpp
@@ -0,0 +1,16 @@
+#include "util.h"
+#include <iostream>
+#include <net_base.h>
+
+int main()
+{
+    char testBuffer[] = "NIhao";
+    auto logger = get_logger("test", "test.log");
+    CClient client(logger);
+    if (client.Connect("127.0.0.1", "8989")) {
+        std::cout << client.Send(testBuffer, sizeof(testBuffer)) << std::endl;
+        client.Receive();
+    }
+    client.Disconnect();
+    return 0;
+}
\ No newline at end of file
diff --git a/util/CMakeLists.txt b/util/CMakeLists.txt
new file mode 100644
index 0000000..c5433ca
--- /dev/null
+++ b/util/CMakeLists.txt
@@ -0,0 +1,14 @@
+cmake_minimum_required(VERSION 3.16)
+
+project(trans_util LANGUAGES CXX)
+
+if (MSVC)
+    add_definitions(-D_WIN32_WINNT=0x0601)
+    add_compile_options(/source-charset:utf-8)
+endif()
+
+set(SOURCES
+    util.h util.cpp
+)
+add_library(trans_util STATIC ${SOURCES})
+target_include_directories(trans_util PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
\ No newline at end of file
diff --git a/util/util.cpp b/util/util.cpp
new file mode 100644
index 0000000..d789408
--- /dev/null
+++ b/util/util.cpp
@@ -0,0 +1,14 @@
+#include "util.h"
+
+std::shared_ptr<spdlog::logger> get_logger(const std::string& mark, const std::string& log_file)
+{
+    auto file_sink = std::make_shared<spdlog::sinks::rotating_file_sink_mt>(log_file, 1024 * 50, 3);
+    auto console_sink = std::make_shared<spdlog::sinks::stdout_color_sink_mt>();
+    file_sink->set_pattern("[%Y-%m-%d %H:%M:%S.%e][%l]: %v");
+    console_sink->set_pattern("[%Y-%m-%d %H:%M:%S.%e][%l]: %v");
+    std::vector<spdlog::sink_ptr> sinks{file_sink, console_sink};
+    auto logger = std::make_shared<spdlog::logger>(mark, sinks.begin(), sinks.end());
+    logger->set_level(spdlog::level::info);
+    spdlog::register_logger(logger);
+    return logger;
+}
\ No newline at end of file
diff --git a/util/util.h b/util/util.h
new file mode 100644
index 0000000..5a38464
--- /dev/null
+++ b/util/util.h
@@ -0,0 +1,8 @@
+#ifndef TRANSM_UTIL
+#define TRANSM_UTIL
+#include <spdlog/sinks/rotating_file_sink.h>
+#include <spdlog/sinks/stdout_color_sinks.h>
+#include <spdlog/spdlog.h>
+
+std::shared_ptr<spdlog::logger> get_logger(const std::string& mark, const std::string& log_file);
+#endif
\ No newline at end of file