GetCBusState / SetCBusState implementation details

Do these functions and there brethren always result in network traffic?

For instance is a call to GetCBusState served from an in memory state built from previous messages or does it send a network request?

And likewise If I call SetCBusState to the value that is currently set does it send a network message?

Thanks
Alan

 

Cbus does not poll. It maintains an internal state and returns the data from there when you read it.

It always sends out a setCbusState command irrespective of the current state. That is because some devices work on the reception of the command as well as the value. For example the shutter relay uses a fixed value for a toggle command so each time you issue the same command it alternates between open/stop etc. This is why you need to use the ONCE statement rather than IF in logic to stop flooding the bus with continuous messages.