Using lv_msg_send d 9.2

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Hi.
In version 8.3, I actively use message transmission through lv_msg_send. Now I want to upgrade to version 9.2, but unfortunately, I couldn’t find a similar service for message transmission. How can I use this functionality in version 9.2?

Please take a look at the Observers.

They are similar but way more powerful than lv_msg was.

Thanks