I know the documentation for V3 is lacking.
I will try and see if we can get someone to write a better sample code.
The V2 Sample code was written by me, but I don't have time to do V3. I am preparing for maker faire which is only a week away.
You should be able to compare the 2 main codes and modify the V3 code to work with the Send sketch...
In this example you need 2 Arduinos since the communication is via I2C and not Serial.
You could also make a serial version which would be easier I think, since you dont need to worry about I2C protocol.