LIN constantly receiving and sending?

[total_and_STM32]

Hello all,

I am on the STM23 H750 discovery dev. kit working either in Keil or CubeZone IDE-just started, anyway, so far so good, and according to the logic analyser the LIN works, at least the checksum is right :) 

So far I am sending the frame once the button is pressed, made with switch and different states...  this only sends out the LIN frame once the button is pressed, is this normal, OK, or should the LIN frame be send once the button is pressed continuously every 3 or more seconds... For example, I am reading the bus from the other device, random, and it is sending out frame every few seconds, looks rather random... attaching a pic of analyser...

Thank you in advance and I am looking forward!

Best.