Send a response disposition to the service to indicate that
        a received message has been accepted. If the client is running in PeekLock
        mode, the service will wait on this disposition. Otherwise it will
        be ignored. Returns `True` is message was accepted, or `False` if the message
        was already settled.

        :rtype: bool
        :raises: TypeError if the message is being sent rather than received.

def accept(self):
        """Send a response disposition to the service to indicate that
        a received message has been accepted. If the client is running in PeekLock
        mode, the service will wait on this disposition. Otherwise it will
        be ignored. Returns `True` is message was accepted, or `False` if the message
        was already settled.

        :rtype: bool
        :raises: TypeError if the message is being sent rather than received.
        """
        if self._can_settle_message():
            self._response = errors.MessageAccepted()
            self._settler(self._response)
            self.state = constants.MessageState.ReceivedSettled
            return True
        return False