SNIP_CLASSIC_MODEMANAGEMENTGUIDE_SECTION_3_4_3_J1939_Networkmanagement

3.4.3 J1939 Networkmanagement In contrast to current AUTOSAR network management, the task of J1939 network management is not to handle sleep and wake-up of ECUs, but to assign unique addresses to each node represented by an ECU. This is achieved by sending the AddressClaimed (AC, 0x0EE00) parameter group at start-up, which announces the desired address. If another node claims the same address, and has higher priority, the node has to go silent after sending the CannotClaimAddress parameter group (AC with null address as SA), or try to use another address. To support this use case the BswM is extended to accept state change indications from the J1939Nm via the API function BswM_J1939Nm_StateChangeNotification() (see also 3.2.2.2.16). Guide to Modemanagement Depending on the state indicated by the network management the BswM needs to switch ComIPduGroups of COM, PduRRoutingPathGroups of PduR, and general request handling of the J1939Rm. The first two actions are realized via BswMPduGroupSwitch- and BswMPduRouterControl -actions. The J1939 Request Manager shall be switched using the BswMJ1939Rm action. COM is expected to have IPDU groups containing all locally received and transmitted I-PDUs for each network. The PduR shall be configured in the same way, having RoutingPathGroups for all locally received and transmitted IPDUs for each channel, excluding the received I-PDU for the Request message forwarded to the J1939Rm. The BswM must then be configured to switch on and off the aforementioned IPDU groups and PduRRoutingPathGroups depending on the reported NM states, as well as general request handling of the J1939 Request Manager. The following rule shows the actions of the BswM depending on the NM states. Listing 3.21: Rule to implement network management according to J19392 rule J1939_nm_normal_operation initially false { if ( J1939NmState == NM_STATE_NORMAL_OPERATION ) { actionlist J1939NormalOperationActions } } actions J1939NormalOperationActions on condition { PduGroupSwitch { init true enable ArMmExample.EcuC.MyCom.J1939IPDUS } PduRoute enable J1939_RoutingPath custom "J1939Rm_SetState(J1939RM_STATE_ONLINE)" custom "Xcp_SetTransmissionMode(CHANNEL1,XCP_TX_ON)" } rule J1939_nm_offline initially false { if ( J1939NmState != NM_STATE_NORMAL_OPERATION ) { actionlist J1939OfflineActions } } actions J1939OfflineActions on condition { PduGroupSwitch { disable ArMmExample.EcuC.MyCom.J1939IPDUS } PduRoute disable J1939_RoutingPath custom " J1939Rm_SetState(J1939RM_STATE_OFFLINE)" custom "Xcp_SetTransmissionMode(CHANNEL1,XCP_TX_OFF)" } 2It is recommended to use the BswMJ1939Rm action instead of the custom calls. The custom calls are only used in this listing as they are not supported in the current ARText version. Guide to Modemanagement