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You can define your own key-pair message/s and a corresponding service with a key in the request and the value in the response. The simplest thing would be to store initially non-string values into a string and have the msg and srv be each two strings, the 12 from your example would be a "12".

The node would subscribe to the StringString message type and be a String service provider, it could have a python dict or C++ std::map<std::string, std::string> for the data structure.

You can define your own key-pair message/s and a corresponding service with a key in the request and the value in the response. The simplest thing would be to store initially non-string values into a string and have the msg and srv be each two strings, the 12 from your example would be a "12".

The node would subscribe to the StringString message type and be a String service provider, it could have a python dict or C++ std::map<std::string, std::string> for the data structure.