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Generic Pub / Sub; To and from JSON

I am interested in subscribing to a set of topics, receiving messages and sending messages to topics. I have a generic subscription as void cb_generic(const std::string& _msg). The content of the string is protobuf binary message which I want to convert to JSON. Any suggestions or examples on how to accomplish this task? The steps I see are:

  1. Convert std::string to protobuf object
  2. Convert protobuf object to json.