Some button repeats IBUS message while the button is being pressed.
“Dur:” is the interval of the repeated IBUS message. (Unit is 10ms.)
The Down Button Message is sent repeatedly while the button is being pressed.

Example:
BMW Volume+/- buttons repeat IBUS message every 100ms(“Dur:10”) while the
volume button is being pressed.

Down Button Message is
Dur: 10 Len: 4 sID:50 dID:68 Data:32 11

While the button is being pressed, the messages are sent to the radio though BSGd every 100ms like below.

Len: 4 sID:50 dID:68 Data:32 11
Len: 4 sID:50 dID:68 Data:32 11
Len: 4 sID:50 dID:68 Data:32 11
Len: 4 sID:50 dID:68 Data:32 11
Len: 4 sID:50 dID:68 Data:32 11
….