import websocket #pip install websocket-client
import json
import threading
import time

token_file = open("token.txt", "r")
token_read = token_file.read()
token_list = token_read.split()
token_file.close()
print(token_list)

def send_json_request(ws, request):
    ws.send(json.dumps(request))

def recieve_json_response(ws):
    response = ws.recv()
    if response:
        return json.loads(response)

def heartbeat(interval, ws):
    print( Heartbeat begin )
    while True:
        time.sleep(interval)
        heartbeatJSON = {
            "op": 1,
            "d": "null"
        }
        send_json_request(ws, heartbeatJSON)
        print("Heartbeat sent")

for index , v in enumerate(token_list):
    ws = websocket.WebSocket()
    ws.connect( wss://gateway.discord.gg/?v=6&encording=json )
    event = recieve_json_response(ws)

    heartbeat_interval = event[ d ][ heartbeat_interval ] / 1000
    threading._start_new_thread(heartbeat, (heartbeat_interval, ws))


    pis=1
    payload = {
         op : 2,
        "d": {
            "token": v,
            "properties": {
                "$os": "windows",
                "$browser": "chrome",
                "$device":  pc 
            }
        }
    }
    try:
        send_json_request(ws, payload)
    except:
        index += 1
        print(index, "error")

Exception ignored in thread started by: <function heartbeat at 0x00000236C458D3A0>
Traceback (most recent call last):
  File "C:UserspcDesktop	estwebsoket.py", line 38, in heartbeat
    send_json_request(ws, heartbeatJSON)
  File "C:UserspcDesktop	estwebsoket.py", line 16, in send_json_request
    ws.send(json.dumps(request))
  File "C:UserspcAppDataLocalProgramsPythonPython39libsite-packageswebsocket\_core.py", line 282, in send
    return self.send_frame(frame)
  File "C:UserspcAppDataLocalProgramsPythonPython39libsite-packageswebsocket\_core.py", line 310, in send_frame
    l = self._send(data)
  File "C:UserspcAppDataLocalProgramsPythonPython39libsite-packageswebsocket\_core.py", line 514, in _send
    return send(self.sock, data)
  File "C:UserspcAppDataLocalProgramsPythonPython39libsite-packageswebsocket\_socket.py", line 175, in send
    return _send()
  File "C:UserspcAppDataLocalProgramsPythonPython39libsite-packageswebsocket\_socket.py", line 152, in _send
    return sock.send(data)
  File "C:UserspcAppDataLocalProgramsPythonPython39libssl.py", line 1173, in send
    return self._sslobj.write(data)
ConnectionAbortedError: [WinError 10053]

works fine for some time But I get an error and the connection is closed What did I do wrong?