it seems that upgrading OSX to 10.11.5 may be causing the ManufacturerData field of the AdvertisementData to be missing when reported to centralManager: didDiscoverPeripheral: advertisementData: RSSI:.
it tends to be there if the device turns on while scanning, but if the device is already advertising when scanning starts, it's unlikely to be present.
edit, more details:
what i'm seeing in the CBCentralManagerDelegate callback centralManager: didDiscoverPeripheral: etc is that the dictionary which is passed to that method is always lacking the key kCBAdvDataManufacturerData if the application launches after the peripheral has been on (and therefore advertising) for a while. If the peripheral is turned on after the application launches, then that key is sporadically present approximately 1/3 of the time for about 30 seconds, and then disappears forever. (forever = at least 6 minutes)
any ideas ?
