Expose C# service to C++ COM client

I have lot of function calls and back events in an .NET dll. which I want to expose above as service. This new service will be consumed by new .Net application and an old COM C++ application.(two way communication since events with data will be fired from service to clients and client will make function call on service) I know we can use WCF or GRPC to do this. But WCF is dead and GRPC depends on IDL/Proto file which i want to avoid. Are there any other possible solutions which are simple.

Solution

Even tough SignalR-Client-Cpp suits our need. After trying out it, we found that its not actively supported and not easy to use on windows. So ended up into GRPC.

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