first commit

test_tool.py

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+import socket
+import threading
+
+s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+
+s.bind(('', 3900))
+s.listen(100)
+
+
+def process(conn, addr):
+    print('accept connection from', str(addr))
+    data = conn.recv(4096)
+    data = data.decode()
+    print(data)
+
+
+while True:
+    conn, addr = s.accept()
+    threading.Thread(target=process, args=(conn, addr)).start()