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P3D v4 Passing on masked simconnect brake events

Hi all,

I was hoping someone could help me out with a P3D simconnect problem I'm having.

I'm a fairly experienced C programmer but a bit of a noob when it comes to simconnect.

As a proof of concept I've been looking at how to model the brakes system in an airliner, I think I've found the right idea/approach but my implementation is lacking.

When the user presses the brakes button my code successfully intercepts the event before P3D 'sees' it and I perform some validation, if the brakes aren't available I just move on but if the brakes are available I'd like to pass this "Brakes" event on to the sim but I can't get it to work.

I'm using


check comes back as S_OK but the brakes don't even twitch...

2 questions..

1) Am I going about this the right way or is there a better approach?

2) How do I send the masked event on to P3D so it then reacts to it?


The KEY_BRAKES is a momentary on/off. To keep the brakes on, a user has to hold the key (typically the '.' key down and the sim gets flooded with the keyboard input which makes the brakes stay applied.
You can't just send the brakes command one time and have them stay on. Not how that input works.

Also, your approach won't work for rudder pedals that have toe brakes.
Ah, OK, thanks, that's a shame.

Ignoring the axis brakes issue, is there a better event to subscribe to for this to work or does it need a whole new approach?