[Nexus 6P Q&A, Help & Troubleshooting] PeQuEsan:
Sorry to bother you. I'm a Nexus 5 user but I'm dealing with same bluedroid wakelocks, and watching the log I see BLE scans every 2 seconds...

02-18 16:38:20.946 4326 4349 D BluetoothAdapter: STATE_ON
02-18 16:38:20.947 2130 2243 D BtGatt.GattService: stopScan() - queue size =1
02-18 16:38:20.947 2130 2194 D BtGatt.ScanManager: stop scan
02-18 16:38:20.947 2130 2194 D BtGatt.ScanManager: configureRegularScanParams() - queue=0
02-18 16:38:20.947 2130 2194 D BtGatt.ScanManager: configureRegularScanParams() - ScanSetting Scan mode=-2147483648 mLastConfiguredScanSetting=0
02-18 16:38:20.947 2130 2194 D BtGatt.ScanManager: configureRegularScanParams() - queue emtpy, scan stopped
02-18 16:38:20.982 2130 2242 D BtGatt.GattService: unregisterClient() - clientIf=5
02-18 16:38:20.988 4326 4349 D BluetoothAdapter: STATE_ON
02-18 16:38:20.995 2130 2142 D BtGatt.GattService: registerClient() - UUID=5c617281-6b4e-4ec9-a3ab-811f7cb949f7
02-18 16:38:20.996 2130 2191 D BtGatt.GattService: onClientRegistered() - UUID=5c617281-6b4e-4ec9-a3ab-811f7cb949f7, clientIf=5
02-18 16:38:20.997 4326 4336 D BluetoothLeScanner: onClientRegistered() - status=0 clientIf=5
02-18 16:38:21.001 2130 2243 D BtGatt.GattService: start scan with filters
02-18 16:38:21.003 2130 2194 D BtGatt.ScanManager: handling starting scan
02-18 16:38:21.004 2130 2194 D BtGatt.ScanManager: configureRegularScanParams() - queue=1
02-18 16:38:21.004 2130 2194 D BtGatt.ScanManager: configureRegularScanParams() - ScanSetting Scan mode=0 mLastConfiguredScanSetting=-2147483648
02-18 16:38:21.004 2130 2194 D BtGatt.ScanManager: configureRegularScanParams - scanInterval = 8000configureRegularScanParams - scanWindow = 800
02-18 16:38:21.005 2130 2191 D BtGatt.GattService: onScanParamSetupCompleted : 0
02-18 16:38:21.166 2130 2191 D bt_btif_gattc: btif_gattc_update_properties BLE device name=Charge HR len=9 dev_type=2
02-18 16:38:23.083 4326 4349 D BluetoothAdapter: STATE_ON
02-18 16:38:23.085 2130 2142 D BtGatt.GattService: stopScan() - queue size =1
02-18 16:38:23.086 2130 2194 D BtGatt.ScanManager: stop scan
02-18 16:38:23.087 2130 2194 D BtGatt.ScanManager: configureRegularScanParams() - queue=0
02-18 16:38:23.087 2130 2194 D BtGatt.ScanManager: configureRegularScanParams() - ScanSetting Scan mode=-2147483648 mLastConfiguredScanSetting=0
02-18 16:38:23.087 2130 2194 D BtGatt.ScanManager: configureRegularScanParams() - queue emtpy, scan stopped
02-18 16:38:23.103 2130 2243 D BtGatt.GattService: unregisterClient() - clientIf=5
02-18 16:38:23.109 4326 4349 D BluetoothAdapter: STATE_ON
02-18 16:38:23.133 2130 2144 D BtGatt.GattService: registerClient() - UUID=2c7bf445-f361-4229-9755-c5536ffe3f26
02-18 16:38:23.134 2130 2191 D BtGatt.GattService: onClientRegistered() - UUID=2c7bf445-f361-4229-9755-c5536ffe3f26, clientIf=5
02-18 16:38:23.135 4326 7406 D BluetoothLeScanner: onClientRegistered() - status=0 clientIf=5
02-18 16:38:23.139 2130 2142 D BtGatt.GattService: start scan with filters
02-18 16:38:23.151 2130 2194 D BtGatt.ScanManager: handling starting scan
02-18 16:38:23.152 2130 2194 D BtGatt.ScanManager: configureRegularScanParams() - queue=1
02-18 16:38:23.152 2130 2194 D BtGatt.ScanManager: configureRegularScanParams() - ScanSetting Scan mode=0 mLastConfiguredScanSetting=-2147483648
02-18 16:38:23.152 2130 2194 D BtGatt.ScanManager: configureRegularScanParams - scanInterval = 8000configureRegularScanParams - scanWindow = 800
02-18 16:38:23.168 2130 2191 D BtGatt.GattService: onScanParamSetupCompleted : 0
02-18 16:38:23.457 2130 2191 D bt_btif_gattc: btif_gattc_update_properties BLE device name=v1.3 len=4 dev_type=3

I've tried freezing (using Titanium Backup) every app I could suspect to have anything to do... No success... I don't have any wearable, not Fitbit... I also have Google Fit freezed!

My question is: how is it possible to see these log messages about BLE scans, and there's no human way to see which app is causing them?!!

I just can't understand... Everyone that has found the causing app in this thread has found it just trying back and forth... No "reproducible" way to find the app. :(

Aaaarrrhhhgggg!