Thanks.. Looked again today and it has calmed down.. Maybe it's just at start-up before there are any messages received or maybe something reading the Serial Port.

What is the CPU usage of PiGatewaySerial when you look at top? Mine is using 97%.

@Vladut-Grecu

The instructions didn't work for me until I did a sudo make install in the librf24-bcm folder. After the libraries were installed, I was able to make the PiGateway and PiGatewaySerial executables.
Also, PiGatewaySerial will only run as root (or sudo).

Thanks for the instructions, it was a great starting point! Now to install a controller....