Core Bluetooth - constant RSSI updates of in-range devices

Question

I just started with the core bluetooth framework for iOS and I\'m developing an app that needs to constantly scan for BLE devices so that I can retrieve their RSSI number ev

Answer 1

Is far as I can see, this should do what you want.

When you started scanning for peripherals with the original call, your delegate should begin to get calls whenever a BLE device is discovered. This will continue until you stop the scan with a call to

[manager stopScan];

I don't think you actually need the second call to scanForPeripheralsWithServices in your centralManager:didRetrievePeripherals method, since, as far as I know, the scanning doesn't stop until you tell it to. I'm still getting started on this, too, though, and there may be a timeout I have not found, yet.

I'm pretty sure the reason you get a call about once a minute is because the BLE device is only advertising that often. If it advertises more often, like a device in discovery mode, I think you will get the calls more often. I would be interesting if you could confirm that. If the device has a discovery mode, you might try triggering it to see if the notices speed up.