Android Question BLE2 scan is slow in Android 8

[Rick in North Carolina]

I am testing BLE Peripheral as a beacon, transmitting at 100 ms latency and it is working great.
https://www.b4x.com/android/forum/threads/ble-peripheral.84051/#content

My receiving tablet with Android 7.0 is using a modified Erel example - BLE2 (Ble Central) to scan for the peripheral beacon's UUID and is working great (just want to find, not connect).

 manager.Scan2(Array(ServiceId),True)

I tried the same app with a tablet using Android 8.0 (Samsung Tab S4) and there is a significant delay in Device_found.
(Yes I tried the same code with target 26 and run-time permissions, it did not make a difference).

The pic shows the speed difference between Android 7 and Android 8.


(I tried uploading my Ble Central app .zip, but posting said file too large - 603 kb)

 

[Erel]

(I tried uploading my Ble Central app .zip, but posting said file too large - 603 kb)

You should use File - Export as zip to create the zip. Though it doesn't sound like a coding error.

I've posted an example of starting a scan with custom settings: https://www.b4x.com/android/forum/threads/ble-scansettings.94908/#post-600231

Try it.

 

[Rick in North Carolina]

Thank You Erel. A quick try seems to be faster, but I had an issue adding ScanFilter custom settings (my lack of understanding of javaObject with ScanFilter.Builder ) I started a new thread for that. https://www.b4x.com/android/forum/threads/ble-custom-scanfilter-device-settings.99300/