ROS2 subscribe IsNew output remains true even if no new messages are received

I am running a 2021b code generated simulink model in ubuntu and need to use the IsNew funcionality of the ROS2 subscribe blocks.

However, I am finding that intially the IsNew output is false, but as soon as a message is received on the topic, the output goes True and stays True even if no more messages are received. I have tried with different QoS settings with no change in behaviour.

Has anyone else run into this issue and has a solution/workaround?

Thanks

Answer 1

[Josh Chen]

Hello Callum,

This is a known issue in 2021b and earlier version of MATLAB. Please update your MATLAB to at least 2021b Update 4 from this Error bug report link and try to generate code again.

Best,

Josh

[Callum]

Thanks Josh, that has now solved the problem.