So peer sends message "2.13123,32.1234"
Host receives the message, saves it to a variable (or array or dictionary or instance variable ect.)
On peer message - set SavedMessage to Multipayer.Message
To get the first value as a float, use float(tokenat(SavedMessage,0,",")) - returns 2.13123 as a value.
To get the second value, use float(tokenat(SavedMessage,1,",")) - returns 32.1234 as a value
You can use tokenat directly on Multiplayer.Message itself instead of saving it to an intermediate storage variable first if you don't need the value to persist.