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Blank Message

Create blank ROS 2 message using specified message type

Since R2019b

  • Blank Message ROS 2 block

ROS Toolbox / ROS 2


The Blank Message block creates a Simulink® nonvirtual bus corresponding to the selected ROS message type. The block creates ROS message buses that work with Publish, Subscribe, Call Service and Send Action Goal blocks.



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Blank ROS 2 message, returned as a non-virtual bus. To specify the type of ROS message, use the Type parameter. All elements of the bus are initialized to 0. The lengths of the variable-length arrays are also initialized to 0.

Data Types: bus


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Class of ROS 2 message, specified as Message, Service Request, Service Response, Action Goal, Action Feedback and Action Result.

For basic publishing and subscribing, use the Message class. To create a service request message for Call Service input, use the Service Request class. To create an action goal message for Goal input of Send Action Goal, use the Action Goal class. You can use the Action Feedback or Action Result classes to create an action feedback message or action result message of specific type respectively.

ROS 2 message type, specified as a character vector or a dialog box selection. Use Select to select from a list of supported ROS messages. The list of messages given depends on the Class of message you select.

Interval between outputs, specified as a numeric scalar. The default value indicates that the block output never changes. Using this value speeds simulation by eliminating the need to recompute the block output. Otherwise, the block outputs a new blank message at each interval of Sample time.

For more information, see Specify Sample Time (Simulink).

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2019b