<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def thread_function(self):
 """Thread function."""


        self.__subscribed = True
        url = SUBSCRIBE_ENDPOINT + "?token=" + self._session_token

        data = self._session.query(url, method='GET', raw=True, stream=True)
        if not data or not data.ok:
            _LOGGER.debug("Did not receive a valid response. Aborting..")
            return None

        self.__sseclient = sseclient.SSEClient(data)

        try:
            for event in (self.__sseclient).events():
                if not self.__subscribed:
                    break
                data = json.loads(event.data)
                if data.get('status') == "connected":
                    _LOGGER.debug("Successfully subscribed this base station")
                elif data.get('action'):
                    action = data.get('action')
                    resource = data.get('resource')
                    if action == "logout":
                        _LOGGER.debug("Logged out by some other entity")
                        self.__subscribed = False
                        break
                    elif action == "is" and "subscriptions/" not in resource:
                        self.__events.append(data)
                        self.__event_handle.set()

        except TypeError as error:
            _LOGGER.debug("Got unexpected error: %s", error)
            return None

        return True