Temperature sensor and sensor plugin

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The temperature is outpuded in a custom message by a world plug in my world. Then I'm trying to find a way to read this message: my first idea was to write a sensor plugin, but i need to write also a specific sensor to do that, right?

Yeah, you'd have to write a sensor. I think you can bypass writing a sensor by just writing a model plugin. The model plugin can read the message from the world, and process it as necessary.

I can't find anywhere information abuot the creation of a new sensor. Someomne can help me?

Take a look at SensorsIface.hh