Hello
@Jukkendarsunda2,
Are you looking at using the Salesforce Pub/Sub API? There are no standard gRPC VBOs available at the moment, but there are various toolkits for .NET that support gRPC. So you could build a VBO to provide the necessary client actions for communicating with a gRPC service. I'd start by searching Google for "C# grpc client".
Cheers,
Eric