code: def confirmation(self, pdu):
          
          if _debug: NetworkAdapter._debug("confirmation %r (net=%r)", pdu, self.adapterNet)
  
          npdu = NPDU(user_data=pdu.pduUserData)
          npdu.decode(pdu)
          self.adapterSAP.process_npdu(self, npdu)
docs: Decode upstream PDUs and pass them up to the service access point.