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import asyncio
import threading

HOST = '127.0.0.1'
PORT = 9000
CLIENTS = []

async def echo_server(reader, writer):
    while True:
        data = await reader.read(100)  # Max number of bytes to read
        if not data:
            break
        writer.write(data)
        await writer.drain()  # Flow control, see later
    writer.close()

async def startServer(host, port):
    server = await asyncio.start_server(echo_server, host, port)
    print(f"Server Started at {HOST} on {PORT}")
    await server.serve_forever()
    
def setLoopEventForServerStart():
    startServerLoop = asyncio.new_event_loop()
    asyncio.set_event_loop(startServerLoop)
    asyncio.run(startServer(HOST, PORT))

async def createClient():
    client = await asyncio.open_connection(HOST, PORT)
    if client:
        CLIENTS.append(client)
        print(f"Client appended {client}")
        return client

def joinClient():   
    asyncio.run(joinClient())

async def sendMessageToServer(socket, message="hello World"):
    reader, writer = socket
    writer.write(message)
    writer.drain()

startServerThread = threading.Thread(target=setLoopEventForServerStart)
startServerThread.start()

asyncio.run(createClient())
asyncio.run(createClient())

Error 
Server Started at 127.0.0.1 on 9000
Traceback (most recent call last):
  File "/home/needjobcoder/devlopment/python/_socketProgramming/asyncioTest.py", line 47, in <module>
    asyncio.run(createClient())
  File "/usr/lib/python3.10/asyncio/runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "/usr/lib/python3.10/asyncio/base_events.py", line 649, in run_until_complete
    return future.result()
  File "/home/needjobcoder/devlopment/python/_socketProgramming/asyncioTest.py", line 29, in createClient
    client = await asyncio.open_connection(HOST, PORT)
  File "/usr/lib/python3.10/asyncio/streams.py", line 48, in open_connection
    transport, _ = await loop.create_connection(
  File "/usr/lib/python3.10/asyncio/base_events.py", line 1076, in create_connection
    raise exceptions[0]
  File "/usr/lib/python3.10/asyncio/base_events.py", line 1060, in create_connection
    sock = await self._connect_sock(
  File "/usr/lib/python3.10/asyncio/base_events.py", line 969, in _connect_sock
    await self.sock_connect(sock, address)
  File "/usr/lib/python3.10/asyncio/selector_events.py", line 501, in sock_connect
    return await fut
  File "/usr/lib/python3.10/asyncio/selector_events.py", line 541, in _sock_connect_cb
    raise OSError(err, f'Connect call failed {address}')
ConnectionRefusedError: [Errno 111] Connect call failed ('127.0.0.1', 9000)

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stats: 74 lines, 218 words, 2.63kb