GNU/Linux based Passenger Information System

Hi folks,
I am launching a new project for an everywhere available, free as in free speach and universal passenger information system for public transport.

Can you recommend frameworks, technologies or programming languages that are running on the server (the back end) to interact with mobile, smart devices for data exchange?

My prototype is a LAMP server that uses HTTP POST and GET to exchange data from mariadb (mysql) to android apps.

I have the gut feeling that this strategy is not able to realize more complex business logic or more elaborate use cases. Does anyone has experience with free/libre back end development? My strong domain is embedded systems development. That is why I can make use of any help for the back end.

Do you think I can stay in the free/libre software domain to realize my project?

I made first experiences with Replicant as alternative to Android and it looks quite promising. The limited number of supported devices makes me some headaches.


Moderation info: This is a cross-post with this and that post.

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Wow! How do you get to know that?Are you taking an active roll in all those message boards? Cheers!