Iterate through device "sensor pool"?

I'm trying to determine what devices are known to Connect IQ.  I can iterate through the sensors (Sensor.getRegisteredSensors) but this doesn't include other types of ANT, ANT+ and BLE devices.  At the moment, I'm trying to determine what derailleurs are known.  As near as I can tell, Connect IQ maintains a "sensor pool", but I haven't found any way to iterate over that pool.  Any help greatly appreciated.