Identify the test device for Admob

You should use this:

GADMobileAds.sharedInstance().requestConfiguration.testDeviceIdentifiers = ["YOUR IDENTIFIER PRINTED ON DEBUGGER"]

Instead of:

request.testDevices = ["YOUR IDENTIFIER PRINTED ON DEBUGGER"]

Swift Solution

It turns out the AdMob/GoogleAdManager deviceId can be found by computing the MD5 of the advertisingIdentifier. This way you can retrieve and use the test deviceId in code without having to previously have got a device's identifier from the console log.

To avoid the faff of using an ObjC-Swift bridging header (getting MD5 via <CommonCrypto/CommonCrypto.h>), I'd suggest using a Swift wrapper around the CommonCrypto framework, e.g this one:

• SwiftCrypto

Using the above framework (which adds an extension property to String for computing the MD5 hash), it is a simple matter of querying against:

GADMobileAds.sharedInstance().requestConfiguration.testDeviceIdentifiers ?? []).contains(ASIdentifierManager.shared().advertisingIdentifier.uuidString.md5)