Windows Release build does not find devices.

[johncharris]

I have a simple app that does a BLE scan and connects to a device and shows the value of an attribute. This works in debug mode, but when in Release no devices are found. This is before any packaging. I'm trying to run it straight out of the release folder after it was built.

Any ideas?

[Wicz3k]

Did you try flutter clean?
Problem is only on windows?
Did you try example app?
Try share some code.

[johncharris]

I ran the example code, and it works fine so the problem is on my side. I'll update my code to be more like the example and post back if I find the issue.

[johncharris]

I've had no luck figuring this out. I published my code at https://github.com/johncharris/ble_temperture.

[rohitsangwan01]

@johncharris maybe add a try/catch block when calling start scan here in your code, and log that with your addMessage to cross check if startScan is failing somehow in release build

try {
     await UniversalBle.startScan();
catch(e) {
    addMessage("ScanFailed: $e");
}

Or try to compare your windows/CMakeLists.txt with this plugin's example/window/CMakeLists.txt and see if you see any major change there, and try to modify accordingly

or Try to install Nuget

Please try these steps one by one

[Sravdar]

I had similar problem today. When app is first launched it said bluetooth is not enabled. When closed the bluetooth by hand and re-opened it started scaning.

I think on windows release builds when you open the executable onAvailabilityChange callback doesn't get called unlike the behaviour in debug mode. On initstate calling UniversalBle.getBluetoothAvailabilityState(); fixed this problem.