40NBT BT: What is the "SleepMode" value?

Answer

The ?SleepMode? key is used to tell the radio during patch time that when the OS goes into a low power state that it will be receiving a signal from an external pin to go into ?Low Power? mode. In Low Power mode the module will still remained patched however not be functional until it receives a signal from an external pin to resume. Those pins are documented in the HIG.