diff --git a/.idea/libraries/libs.xml b/.idea/libraries/libs.xml
new file mode 100644
index 0000000..2df7eba
--- /dev/null
+++ b/.idea/libraries/libs.xml
@@ -0,0 +1,10 @@
+<component name="libraryTable">
+  <library name="libs">
+    <CLASSES>
+      <root url="file://$PROJECT_DIR$/BasicInfoAPI/libs" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+    <jarDirectory url="file://$PROJECT_DIR$/BasicInfoAPI/libs" recursive="false" />
+  </library>
+</component>
\ No newline at end of file
diff --git a/BasicInfoAPI/BasicInfoAPI.iml b/BasicInfoAPI/BasicInfoAPI.iml
index 37cc804..5c05120 100644
--- a/BasicInfoAPI/BasicInfoAPI.iml
+++ b/BasicInfoAPI/BasicInfoAPI.iml
@@ -7,5 +7,6 @@
     </content>
     <orderEntry type="jdk" jdkName="1.8" jdkType="JavaSDK" />
     <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="libs" level="project" />
   </component>
 </module>
\ No newline at end of file
diff --git a/BasicInfoAPI/src/main/conn/MinecraftServer.java b/BasicInfoAPI/src/main/conn/MinecraftServer.java
new file mode 100644
index 0000000..51b6361
--- /dev/null
+++ b/BasicInfoAPI/src/main/conn/MinecraftServer.java
@@ -0,0 +1,15 @@
+package main.conn;
+
+
+/**
+ * A MinecraftServer instance provides methods to create connection to server and communicate with peer.
+ * This is the basic instance and any info-getting function is base on this class.
+ *
+ * @author Rock Chin
+ */
+public class MinecraftServer extends Thread{
+    @Override
+    public void run(){
+
+    }
+}
diff --git a/BasicInfoAPI/src/test/conn/CommunicateTest.java b/BasicInfoAPI/src/test/conn/CommunicateTest.java
new file mode 100644
index 0000000..5e1af6b
--- /dev/null
+++ b/BasicInfoAPI/src/test/conn/CommunicateTest.java
@@ -0,0 +1,76 @@
+package test.conn;
+
+import com.google.gson.Gson;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.net.Socket;
+import java.nio.charset.StandardCharsets;
+
+public class CommunicateTest {
+    static String host="192.168.1.3";
+    static int port=25565;
+    static DataOutputStream dataOutputStream;
+    static DataInputStream dataInputStream;
+    public static void main(String[] args)throws Exception {
+        Socket socket=new Socket(host,port);
+        System.out.println("established.");
+        dataOutputStream=new DataOutputStream(socket.getOutputStream());
+        dataInputStream=new DataInputStream(socket.getInputStream());
+        System.out.println("streamObjectCreated.");
+        writeVarInt(18);
+        writeVarInt(0x00);
+        writeVarInt(754);
+        writeString("192.168.1.3");
+        writeVarInt(25567);
+        writeVarInt(1);
+//        dataOutputStream.write(1);
+//        dataOutputStream.flush();
+        System.out.println("wroteHandshake.");
+        writeVarInt(0);
+        System.out.println("recv:"+readString());
+    }
+    public static void writeVarInt(int value)throws Exception {
+        do {
+            byte temp = (byte)(value & 0b01111111);
+            // Note: >>> means that the sign bit is shifted with the rest of the number rather than being left alone
+            value >>>= 7;
+            if (value != 0) {
+                temp |= 0b10000000;
+            }
+            dataOutputStream.write(temp);
+            dataOutputStream.flush();
+        } while (value != 0);
+    }
+
+    static void writeString(String s)throws Exception{
+        byte[] b=s.getBytes();
+        writeVarInt(b.length);
+        dataOutputStream.write(b);
+        dataOutputStream.flush();
+    }
+    static void writePacket(){}
+    public static String readString()throws Exception{
+        int len=readVarInt();
+        byte[] b=new byte[len];
+        dataInputStream.read(b,0,len);
+        return new String(b);
+    }
+    public static int readVarInt()throws Exception {
+        int numRead = 0;
+        int result = 0;
+        byte read;
+        do {
+            read = dataInputStream.readByte();
+            int value = (read & 0b01111111);
+            result |= (value << (7 * numRead));
+
+            numRead++;
+            if (numRead > 5) {
+                throw new RuntimeException("VarInt is too big");
+            }
+        } while ((read & 0b10000000) != 0);
+
+        return result;
+    }
+}
diff --git a/BasicInfoAPI/src/test/conn/FakeServerTest.java b/BasicInfoAPI/src/test/conn/FakeServerTest.java
new file mode 100644
index 0000000..d368bc1
--- /dev/null
+++ b/BasicInfoAPI/src/test/conn/FakeServerTest.java
@@ -0,0 +1,66 @@
+package test.conn;
+
+import java.io.DataInputStream;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.nio.charset.StandardCharsets;
+
+public class FakeServerTest {
+    static DataInputStream dataInputStream;
+    public static void main(String[] args)throws Exception {
+        ServerSocket socket=new ServerSocket(25567);
+        while (true){
+            Socket client=socket.accept();
+            System.out.println("newConn.");
+            try{
+                dataInputStream=new DataInputStream(client.getInputStream());
+                int len=0;
+                byte[] recv=new byte[2048];
+                System.out.println("Length(varInt):"+readVarInt());
+                System.out.println("PacketID(varInt):"+readVarInt());
+                System.out.println("ProtocolVersion(varInt):"+readVarInt());
+                System.out.println("ServerAddress(String):"+readString());
+                System.out.println("ServerPort(UnsignedShort):"+readUnsignedShort());
+                System.out.println("NextState(varIntEnum):"+readVarInt());
+                while((len=dataInputStream.read(recv))!=-1){
+                    if (len==0)
+                        continue;
+//                    System.out.println("recv:"+new String(recv, StandardCharsets.UTF_8));
+                    for (int i=0;i<1024;i++){
+                        System.out.print(recv[i]+" ");
+                    }
+                    recv=new byte[1024];
+                }
+            }catch (Exception e){
+                e.printStackTrace();
+            }
+        }
+    }
+    public static int readVarInt()throws Exception {
+        int numRead = 0;
+        int result = 0;
+        byte read;
+        do {
+            read = dataInputStream.readByte();
+            int value = (read & 0b01111111);
+            result |= (value << (7 * numRead));
+
+            numRead++;
+            if (numRead > 5) {
+                throw new RuntimeException("VarInt is too big");
+            }
+        } while ((read & 0b10000000) != 0);
+
+        return result;
+    }
+    public static String readString()throws Exception{
+        int len=readVarInt();
+        byte[] b=new byte[len];
+        dataInputStream.read(b,0,len);
+        return new String(b);
+    }
+    public static int readUnsignedShort()throws Exception{
+        return dataInputStream.readUnsignedShort();
+    }
+
+}