I don't use Berry (although its quite interesting), but I do use Lua in this context, and I find that putting a lot of embedded-application logic into a script

I don't use Berry (although its quite interesting), but I do use Lua in this context, and I find that putting a lot of embedded-application logic into a script is very productive - especially in the case where the VM is running and is passed a validated bytecode stream. This is quite an effective way of building sophisticated applications with embedded targets.