Sometime, some messages aren’t received by Velbus module, and often, it’s my bad.
So, let check if the frame is correct with a frame verifier.
http://golfy.free.fr/Velbus/VelbusChecksumCalc.html
Generated with help of an IA (in fact, it’s a kind of test for me, to learn how to instruct IA) but few parts are mine (CSS and Checksum function).
Hope this would help
David