def request(self, apdu):
        """This function is called by transaction functions to send
        to the application."""
        if _debug: ServerSSM._debug("request %r", apdu)

        # make sure it has a good source and destination
        apdu.pduSource = self.pdu_address
        apdu.pduDestination = None

        # send it via the device
        self.ssmSAP.sap_request(apdu)
This function is called by transaction functions to send
        to the application.