Even though the C++ SDK is super bad, unless we roll our own (which is not too hard for what we need, honestly), we could consider grpc

I've never used grpc for IPC, only for network comms. Is it well supported?

it's like..not great for C++, but you can make it work. It's way more supported on go, Python, etc

gRPC has a billion deps in go. Every now and then I spend a bunch of time chasing down something dumb.

wow! I thought it was loved outside C++! ok then, it wasn't worth considering 😄

I might just be grumpy