Hi guys,
Thanks for your responses.
We used the TI BLE Multitool app on iPhone (and the native Bluetooth controls on Windows). I'll give LightBlue a try.
We developed a custom project but when we were getting this problem reverted to trying to run the keyfob firmware. Our board contains an accelerometer so we did our best to mimic the keyfob in every way but with no luck.
There's nothing obvious that needs to be done differently between the CC2541 and the CC2540 is there?
Cheers.