Hi Guys,
How can I have an android or iOS app speak to julia or is it best to pass the data onto an RDBMS and have the mobile apps speak to the RDBMS instead
JuliaDB is not a database in the sense of being used from other languages (directly) or from another process.
Indirectly you can make something in Julia, as server, a web service, and it would look up stuff in JuliaDB. Even then JuliaDB might likely be the wrong solution for you.