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PX4 uORB Message

Create a blank message using specified uORB topic

Add-On Required: This feature requires the UAV Toolbox Support Package for PX4 Autopilots add-on.

  • PX4 uORB Message block

UAV Toolbox Support Package for PX4 Autopilots / PX4 uORB Read and Write Blocks


The PX4 uORB Message block creates a Simulink® nonvirtual bus with a blank message corresponding to the selected uORB topic. The block creates uORB message bus that work with PX4 uORB Write block.


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Blank uORB message, returned as a nonvirtual bus. The type of uORB message is specified using the parameter, Topic. All elements of the bus are initialized to 0. Connect a Bus Assignment block to modify specific fields in the message.

Data Types: bus


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Select the name of the uORB topic for the block to create a blank message. Click Select to browse the topic names available in the px4/Firmware/msg directory that you downloaded.

Enter the time interval at which the block provides blank uORB messages.

The default value indicates that the block output never changes. Using this value speeds the simulation and code generation by eliminating the need to recompute the block output. Otherwise, the block outputs a new blank message at each interval of Sample time.

Version History

Introduced in R2018b