You will need to have Python gRPC tools installed:
pip install grpcio grpcio-tools
And you will need to generate the code from the proto, running this command from the lire-grpc-server directory:
python3 -m grpc_tools.protoc --proto_path=../protos --python_out=. --grpc_python_out=. ../protos/lirec.proto
You should then be able to run the gRPC server (after activating your virtual environment and installing dependencies from requirements.txt):
python server.py &
You can then interact with the gRPC server directly using your gRPC client of choice. If you do not have a tool in mind, grpcurl is a simple command line tool, or you can use a tool with a user interface such as Postman.