Alice Blue server is closing websocket connection.

gistfile1.txt

12:53:31.711.115, alice_blue, INFO, sending heartbeat
12:53:36.712.864, alice_blue, INFO, sending heartbeat
12:53:41.717.905, alice_blue, INFO, sending heartbeat
12:53:46.729.342, alice_blue, INFO, sending heartbeat
12:53:51.731.458, alice_blue, INFO, sending heartbeat
12:53:56.737.723, alice_blue, INFO, sending heartbeat
12:54:01.745.090, alice_blue, INFO, sending heartbeat
12:54:06.751.500, alice_blue, INFO, sending heartbeat
12:54:11.761.191, alice_blue, INFO, sending heartbeat
12:54:16.764.560, alice_blue, INFO, sending heartbeat
12:54:21.771.164, alice_blue, INFO, sending heartbeat
12:54:26.778.870, alice_blue, INFO, sending heartbeat
12:54:31.785.777, alice_blue, INFO, sending heartbeat
12:54:33.89.653, Subscribe, WARNING, Alice Websocket is in error - error Connection is already closed.
12:54:33.90.111, Subscribe, WARNING, Alice Websocket closed
12:54:36.792.882, alice_blue, INFO, sending heartbeat
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.6/threading.py", line 916, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.6/threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "/home/krishna/test/PTrade/broker_alice/alice_blue/alice_blue/alice_blue.py", line 356, in __send_heartbeat
    self.__websocket.send(json.dumps(heart_beat), opcode = websocket._abnf.ABNF.OPCODE_PING)
  File "/home/krishna/.local/lib/python3.6/site-packages/websocket/_app.py", line 119, in send
    "Connection is already closed.")
websocket._exceptions.WebSocketConnectionClosedException: Connection is already closed.

This is one more.
https://gist.github.com/krishnavelu/01c35fbddbb9118dc1f12f59b77c4bbb