Ryan, thank you Sir!
Basically you achieved 3 huge accomplishments
1) You built the Gateway and the gateway allows for the following to work
2) You created a new control board to convert all conventional trains (Post War and newer can motor) to Bluetooth control via an LC or LC+ or Legacy controller, (including electro couplers and you are working on sound)
3) You basically just turned the Legacy controller (thanks to your Gateway) into a Universal Remote, that can control several LC, LC+, TMCC, and Legacy locos at the same time.
Question: If the LC & LC+ can now be controlled by the Legacy Controller with your Gateway, does that mean the Lionel LCS can now control those locos also?, if so, then I guess no need to alter the LC App.
If so, I would love to find a way to bypass the Legacy base and just use Lionel LCS and your Gateway as the universal remote
Thank you
Larry