ClientConn opens client connection with given configuration.

PrepareServe builds gRPC server that allows graceful shutdown.

Serve builds up the gRPC server and starts to serve.

Server creates a gRPC server with TLS and JWT token authorization.

CertFiles is helper struct to keep both needed certification files together.

ClientCfg is gRPC client initialization and configuration struct.

PKI is helper struct to keep need certification files for both S/C.

ServerCfg is gRPC server configuration struct for service init.