Application Service

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Segmentation State Machine

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class appservice.SSM(OneShotTask)

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remoteDevice

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invokeID

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state

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segmentAPDU

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segmentSize

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segmentCount

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maxSegmentsAccepted

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retryCount

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segmentRetryCount

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sentAllSegments

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lastSequenceNumber

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initialSequenceNumber

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actualWindowSize

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proposedWindowSize

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__init__(sap)
Parameters:sap – service access point reference

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start_timer(msecs)
Parameters:msecs – milliseconds

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stop_timer()

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restart_timer(msecs)
Parameters:msecs – milliseconds

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set_state(newState, timer=0)
Parameters:
  • newState – new state
  • timer – timer value
set_segmentation_context(apdu)
Parameters:apdu – application PDU
get_segment(indx)
Parameters:apdu – application layer PDU

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append_segment(apdu)
Parameters:apdu – application PDU

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in_window(seqA, seqB)
Parameters:
  • seqA (int) – latest sequence number
  • seqB (int) – initial sequence number

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FillWindow(self, seqNum)
Parameters:seqNum (int) – initial sequence number

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Client Segmentation State Machine

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Server Segmentation State Machine

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Application Stack

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class appservice.StateMachineAccessPoint(DeviceInfo, Client, ServiceAccessPoint)

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class appservice.ApplicationServiceAccessPoint(ApplicationServiceElement, ServiceAccessPoint)

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