Telethon newMessage-Event does not get called in Apache-Storm python spout

Question

I want to extract the telethon-Event in Strom, but the event doesnt get triggered. It works fine in standalone (without storm), but in a spout there is no activity on an new message. Why?

import storm

from telethon import TelegramClient, events, sync
from telethon.tl.functions.users import GetFullUserRequest
from telethon.tl.functions.channels import GetFullChannelRequest
from telethon.sessions import StringSession
from telethon.tl.types import PeerUser, PeerChat, PeerChannel

from datetime import datetime
import time


class TelethonSpout(storm.Spout):

    def initialize(self, conf, context):
        self._conf = conf
        self._context = context

        storm.logInfo("Spout instance starting...")

    def nextTuple(self):

        api_id = 123456789
        api_hash = '...'
        session="...."

        client = TelegramClient(StringSession(session), api_id, api_hash)

        @client.on(events.NewMessage())
        async def my_event_handler(event):
            storm.logInfo("eve",  event) # -> not called in storm
            storm.emit(["extracted event data "])

        client.start()
        client.run_until_disconnected()


TelethonSpout().run()