Programmatically change UDP Packet Output IP: Desktop Real-Time

Hi,

I have a Simulink desktop real-time model that has a Packet Output set up to do UDP. I want to be able to set it up so it is sending to the correct IP in the InitFcn, rather than hard-coding the IP from the Simulink UI. Does anyone know if it is possible to do that?

I tried a couple approaches:

1. Try accessing with get_param(), but eally cannot find the right model path.
2. Try setting CLIENT_IP = '127.0.0.1' in the base workspace and fill in the IP field with CLIENT_IP instead of the actual IP address. At compile, I get error that this cannot be resolved.

Matlab R2018b, Windows 10.

Blessings,

Spencer

[Manuel K]

Hey, I had the same problem and found this solution:

set_param(block,'toAddress',ip)

Example with the Simulink Real-Time / Real-Time UDP:

set_param([gcb '/Send'],'toAddress',get_param(gcb,'IP'))

where 'IP' is a mask-parameter (Edit).

Best Regards

Manuel

PS: Such parameters can be found using the command

get(gcbh)

which displays all of them.

[Spencer Chen]

Thanks, Manuel. I finally got time to revisit this problem. But I could not follow your solution in my situation. I cannot find the "toAddress" or "IP" fields. I believe the difference is that I'm using the Packet Output block from "Desktop" Real-time rather the the Real-time toolbox. Here's what get(gcbh) yields me:

>> get(gcbh)
                                        Path: 'AllegroDRT_20200430_v406_R2018b/SystemOutput/UDPOutput/UDPSend'
                                        Name: 'UDP_STREAM_OUT'
                                         Tag: ''
                                 Description: ''
                                        Type: 'block'
                                      Parent: 'AllegroDRT_20200430_v406_R2018b/SystemOutput/UDPOutput/UDPSend'
                                      Handle: 8168
                             HiliteAncestors: 'none'
                             RequirementInfo: ''
                                    FontName: 'auto'
                                    FontSize: -1
                                  FontWeight: 'auto'
                                   FontAngle: 'auto'
                                    Selected: 'on'
                                    MaskType: 'Simulink Desktop Real-Time Packet Output'
                             MaskDescription: 'sldrt:sldrtlib:DescPacketOutput'
                                    MaskHelp: 'helpview(fullfile(docroot, 'toolbox', 'sldrt', 'helptargets.map'), 'rtw_packet_out')'
                            MaskPromptString: 'SampleTime|MaxMissedTicks|ShowMissedTicks|YieldWhenWaiting|DrvName|DrvAddress|DrvOptions|PacketSize|DataTypes|ShowReady|ShowError|PacketID|ByteOrder|InitialValue|FinalValue'
                             MaskStyleString: 'edit,edit,checkbox,checkbox,edit,edit,edit,edit,edit,checkbox,checkbox,edit,edit,edit,edit'
                               MaskVariables: 'SampleTime=@1;MaxMissedTicks=@2;ShowMissedTicks=@3;YieldWhenWaiting=@4;DrvName=&5;DrvAddress=@6;DrvOptions=@7;PacketSize=@8;DataTypes=@9;ShowReady=@10;ShowError=@11;PacketID=@12;ByteOrder=@13;InitialValue=@14;FinalValue=@15;'
                      MaskTunableValueString: 'off,on,off,on,off,off,off,off,off,off,off,on,off,on,on'
                          MaskCallbackString: '||||||||||||||'
                            MaskEnableString: 'on,on,on,on,on,on,on,on,on,on,on,on,on,on,on'
                        MaskVisibilityString: 'on,on,on,on,on,on,on,on,on,on,on,on,on,on,on'
                           MaskToolTipString: 'on,on,on,on,on,on,on,on,on,on,on,on,on,on,on'
                          MaskVarAliasString: ''
                          MaskInitialization: ''
                          MaskSelfModifiable: 'off'
                                 MaskDisplay: 'disp('Packet\nOutput')'
                            MaskBlockDVGIcon: ''
                               MaskIconFrame: 'on'
                              MaskIconOpaque: 'opaque'
                              MaskIconRotate: 'none'
                              MaskPortRotate: 'default'
                               MaskIconUnits: 'autoscale'
                             MaskValueString: '-1|1000|off|on|Standard_Devices/UDP_Protocol|50012|[0 50021 49 50 55 46 48 46 48 46 49 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]|STREAM_PACKET_SIZE|STREAM_PACKET_CONFIG|off|off|1|1|[]|[]'
                    MaskRunInitForIconRedraw: 'off'
                           MaskTabNameString: ''
                                        Mask: 'on'
                               MaskCallbacks: {15×1 cell}
                                 MaskEnables: {15×1 cell}
                                   MaskNames: {15×1 cell}
                      MaskPropertyNameString: 'SampleTime|MaxMissedTicks|ShowMissedTicks|YieldWhenWaiting|DrvName|DrvAddress|DrvOptions|PacketSize|DataTypes|ShowReady|ShowError|PacketID|ByteOrder|InitialValue|FinalValue'
                                 MaskPrompts: {15×1 cell}
                                  MaskStyles: {15×1 cell}
                           MaskTunableValues: {15×1 cell}
                                  MaskValues: {15×1 cell}
                         MaskToolTipsDisplay: {15×1 cell}
                            MaskVisibilities: {15×1 cell}
                              MaskVarAliases: {15×1 cell}
                             MaskWSVariables: [1×15 struct]
                                MaskTabNames: {15×1 cell}
                                  MaskObject: []
                                       Ports: [12 0 0 0 0 0 0 0 0]
                                    Position: [435 77 565 638]
                                 Orientation: 'right'
                            PortRotationType: 'default'
                             ForegroundColor: 'darkGreen'
                             BackgroundColor: 'white'
                                  DropShadow: 'off'
                                      IOType: 'none'
                               NamePlacement: 'normal'
                                    ShowName: 'on'
                           HideAutomaticName: 'on'
                                    Priority: ''
                                   Commented: 'off'
                       CodeProfilingOverride: 'inherit'
                      AttributesFormatString: 'UDP Protocol [50012]'
                           InstantiateOnLoad: 'off'
                         PolySpaceEndComment: ''
                       PolySpaceStartComment: ''
                               AncestorBlock: ''
                              ReferenceBlock: 'sldrtlib/Packet Output'
                           SourceLibraryInfo: ''
                              LibraryVersion: '1.241'
                          UserDataPersistent: 'off'
                                    UserData: []
                            CompiledIsActive: 'on'
                                     RTWdata: []
                                     HDLData: []
                                 Diagnostics: ''
                            DialogParameters: [1×1 struct]
                   IntrinsicDialogParameters: [1×1 struct]
                         AlgorithmParameters: [1×1 struct]
                SecondaryAlgorithmParameters: [1×1 struct]
                          CompiledSampleTime: [-1 0]
                            InputSignalNames: {1×12 cell}
                           OutputSignalNames: {1×0 cell}
                         ModelParamTableInfo: []
                StatePerturbationForJacobian: '1.0e-05'
    SCDEnableBlockLinearizationSpecification: 'off'
          SCDBlockLinearizationSpecification: []
                                     CopyFcn: ''
                                   DeleteFcn: ''
                               UndoDeleteFcn: ''
                                     LoadFcn: 'rtblkgui('Load')'
                               ModelCloseFcn: 'close(findall(0, 'Type', 'figure', 'Tag', 'SLDRT_RTBLKGUI', 'UserData', gcbh))'
                                  PreSaveFcn: ''
                                 PostSaveFcn: ''
                                     InitFcn: ''
                                    StartFcn: 'rtblkgui('Start',1)'
                                    PauseFcn: ''
                                 ContinueFcn: ''
                                     StopFcn: 'rtblkgui('Start',0)'
                               NameChangeFcn: ''
                                ClipboardFcn: ''
                                  DestroyFcn: ''
                                  PreCopyFcn: ''
                                     OpenFcn: 'rtblkgui('Open','PO')'
                                    CloseFcn: ''
                                PreDeleteFcn: ''
                              ParentCloseFcn: 'eval(get_param(gcbh, 'ModelCloseFcn'))'
                                     MoveFcn: ''
                                   BlockType: 'S-Function'
                            BlockDescription: 'User-definable block.  Blocks can be written in C, MATLAB (Level-1), and Fortran and must conform to S-function standards.  The variables t, x, u, and flag are automatically passed to the S-function by Simulink.  You can specify additional parameters in the 'S-function parameters' field. If the S-function block requires additional source files for building generated code, specify the filenames in the 'S-function modules' field. Enter the filenames only; do not use extensions or full pathnames, e.g., enter 'src src1', not 'src.c src1.c'.'
                                  LinkStatus: 'resolved'
                            StaticLinkStatus: 'resolved'
                            PortConnectivity: [12×1 struct]
                                 PortHandles: [1×1 struct]
                                 LineHandles: [1×1 struct]
                          CompiledPortWidths: [0×0 struct]
                      CompiledPortDimensions: [0×0 struct]
                       CompiledPortDataTypes: [0×0 struct]
                           CompiledPortUnits: [0×0 struct]
                  CompiledPortComplexSignals: [0×0 struct]
                       CompiledPortFrameData: [0×0 struct]
                   DataTypeOverride_Compiled: 'UseLocalSettings'
              MinMaxOverflowLogging_Compiled: 'UseLocalSettings'
                                Capabilities: [1×1 Capabilities]
                             IOSignalStrings: []
                               RuntimeObject: [0×1 double]
                         ExtModeUploadOption: 'none'
                     ExtModeLoggingSupported: 'off'
                          ExtModeLoggingTrig: 'off'
                   TargetArchitectureMapping: {}
                                FunctionName: 'sldrtpo'
                                  Parameters: 'SampleTime,MaxMissedTicks,ShowMissedTicks,YieldWhenWaiting,DrvName,DrvAddress,DrvOptions,PacketSize,DataTypes,ShowReady,ShowError,PacketID,ByteOrder,InitialValue,FinalValue'
                            SFunctionModules: ''''
                                  SampleTime: '-1'
                              MaxMissedTicks: '1000'
                             ShowMissedTicks: 'off'
                            YieldWhenWaiting: 'on'
                                     DrvName: 'Standard_Devices/UDP_Protocol'
                                  DrvAddress: '50012'
                                  DrvOptions: '[0 50021 49 50 55 46 48 46 48 46 49 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]'
                                  PacketSize: 'STREAM_PACKET_SIZE'
                                   DataTypes: 'STREAM_PACKET_CONFIG'
                                   ShowReady: 'off'
                                   ShowError: 'off'
                                    PacketID: '1'
                                   ByteOrder: '1'
                                InitialValue: '[]'
                                  FinalValue: '[]'

[Spencer Chen]

I'm adopting a Variant solution with a small set of hardcoded IPs as a workaround.

[Manuel K]

I'm sorry, I totally missed what block you are using.

Netherless I played a bit and saw the following line:

DrvOptions: '[0 50021 49 50 55 46 48 46 48 46 49 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]'

The elements after your port address "50021" are the decimal-representation for the ASCII-characters of your IP-adress.

49 50 55 46 48 46 48 46 49

translates to

127.0.0.1

With the following command I could change the IP-adress accordingly.

set_param(gcb,'DrvOptions','[0 50021 49 50 55 46 48 46 48 46 49 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]')

So you just have to convert your IP-adress to the right representation and insert it in this array.

I hope this addresses your issue better.