Hello again, does anyone have some experience with KTor and building custom servers? I'm trying to create a grpc microservice, but have trouble with adding a module.

Ktor Server currently doesn't have GRPC support via a separate module.

For grpc Kotlin Microservices you might want to try Spring + Armeria. Armeria is a library from LINE: https://line.github.io/armeria/ Kotlin Sample: https://github.com/line/armeria/tree/master/examples/grpc-kotlin

@napperley I did find an example though, didnt manage to make it work yet

we are using javalin to expose the resources

Just use grpc-java, isn't that all you need ?

The grpc-java library isn't Ktor Server compatible.