def unsubscribe(self, coro):
        """
        Unsubscribe from status updates from the Opentherm Gateway.
        Can only be used after connect()
        @coro is a coroutine which has been subscribed with subscribe()
        earlier.
        Return True on success, false if not connected or subscribed.
        """
        if coro in self._notify:
            self._notify.remove(coro)
            return True
        return False
Unsubscribe from status updates from the Opentherm Gateway.
        Can only be used after connect()
        @coro is a coroutine which has been subscribed with subscribe()
        earlier.
        Return True on success, false if not connected or subscribed.