This is pretty cool, can I ask why you decided to ship hardware and not a subscription to a dashboard that people could put on any mounted monitor?
Most likely because those dashboards are available for free from your local public transport operator.
It came out of a project that I did [1] from which I wanted to see what it takes to turn that into an actual product[2]. Hardware is a while other game than software especially in low quantity as you still need to deal with things like CE.
[1] https://sschueller.github.io/posts/vbz-fahrgastinformation/
[2] https://sschueller.github.io/posts/turning-a-project-into-a-...