Had an old classon "smart" Helmet(Brooklyness). App does work, company is looking dead. Reverse enginnered the app(android "beyong - micromobity"), quite simple if you have the apk file on hand. The fucker is kotlin which is compiled to Java, and uses AWS for User management(don't want it) and its data, even if a mobile is already required as relay to get the video files off the helmet into the cloud.

Never worked in kotlin and java, and never want to work in it ever again.