diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..32bbd5e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+.idea/*
+.vscode/*
+build/*
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..66e0588
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,15 @@
+cmake_minimum_required(VERSION 3.26)
+
+set(PROJECT_N demo)
+project(${PROJECT_N} VERSION 1.0)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+include_directories(${CMAKE_SOURCE_DIR}/include)
+
+
+add_executable(${PROJECT_N}
+    ${CMAKE_SOURCE_DIR}/third/serialib.cpp
+    main.cc
+)
\ No newline at end of file
diff --git a/demo.exe b/demo.exe
index 5aaf030..dc7ab82 100644
Binary files a/demo.exe and b/demo.exe differ
diff --git a/include/serial.h b/include/serial.h
index 185a50b..56a1d65 100644
--- a/include/serial.h
+++ b/include/serial.h
@@ -98,7 +98,7 @@ public:
         std::this_thread::sleep_for(10ms);
         // char buffer[ser.available()] = {0};
         auto availableSize = ser.available();
-        auto buffer = new char[availableSize];
+        char* buffer = new char[availableSize+1];
         std::memset(buffer, 0, availableSize);
         auto size = ser.readBytes(buffer, availableSize, timeout);
         if(size > 0){
@@ -128,7 +128,7 @@ public:
         while(std::chrono::system_clock::now() < endTime){
             std::this_thread::sleep_for(10ms);
             auto availableSize = ser.available();
-            auto buffer = new char[availableSize];
+            auto buffer = new char[availableSize+1];
             auto size = ser.readBytes(buffer, availableSize, timeout);
             auto str = std::string(buffer);
             delete[] buffer;
diff --git a/main.cc b/main.cc
index 5df52a7..d01a202 100644
--- a/main.cc
+++ b/main.cc
@@ -17,7 +17,7 @@ int main(int argc, char** const argv){
     auto startTime = std::chrono::system_clock::now();
     // auto res = serial.GetAtUntil("AT+CFUN=1","OK", 200);
     // std::cout<<res.value_or("ERROR")<<std::endl;
-    auto res = serial.GetAtResponse("AT+ECICCID", 200);
+    auto res = serial.GetAtResponse("AT+CGSN=0", 200);
     std::cout<<res.value_or("ERROR")<<std::endl;
     auto endTime = std::chrono::system_clock::now();
     std::cout<<std::chrono::duration_cast<std::chrono::milliseconds>(endTime-startTime).count();