I have a sketch with gw.powerUp(); and gw.powerDown(); which used to compile and now it does not. Removing the above calls and it compiles OK.
So have these commands been removed from MySensors 1.5 ?
That worked previously because the MySensors class inherited RF24.
In 1.5 you can initialise a radio driver which has a sleep method that calls powerDown() (in the RF24 case).
The radio automatically wakes up when sending a new message.