[solved] TX not received 255? (NRF24L01+)

Great!

If I'm honest range is not fantastic (with the simple on-board aerial modules). If I put one in the middle my my house I can pretty much do every room, but it won't really go outside.

By default, the boards run at full power transmit already, but you can increase the timeout and also the number of retries, and you can also decrease the transmit speed - all of which will help. I've actually just updated the driver to increase timeout and retry (I'd done it here for some tests), and I also added a setDataRate function so you can do:

nrf.setDataRate(250000);