How to save data to workspace when simulink is running in external mode?

I connect matlab with a ros device, then run simulink in external mode, it can work well. But there is a little problem, the data cannot be saved into matlab workspace, and it appears the following warning. How should I do to save data to matlab workspace or .mat file?

Answer 1

[Swaroop Gopa Srinivas]

I understand that, simulation result need to be stored when model is run in external mode.

Try using To Workspace block to store the output.