I've used the SwiftNIO gRPC and it's much better than the previous non-NIO version (I've had connectivity issues and other implementation issues with it) Currently I'm using it in my Azure Functions Swift language worker Azure Functions Swift support. The very first challenge in building it was finding a good reliable Swift gRPC library, as the Azure Functions host communicates using gRPC. I was so happy to find the SwiftNIO gRPC! Also I used the code generator to generate the Swift protobufs
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