code: def request(self, apdu):
          
          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)
docs: This function is called by transaction functions to send
          to the application.