Release Android BLE clients when the app engine closes

example/pubspec.lock

@@ -689,10 +689,10 @@ packages:
     dependency: transitive
     description:
       name: universal_ble
-      sha256: "8e5f4e2827375900b805fe3eb6cb8a305ade2303289d9a5cba0d09a3a37fea29"
+      sha256: bdebe7d4ff3a24f28b5e56c999104ea1584a9de55da4ee0b4c2346bcf8f8c528
       url: "https://pub.dev"
     source: hosted
-    version: "2.0.1"
+    version: "2.3.0"
   uuid:
     dependency: transitive
     description:

lib/src/managers/ble_manager.dart

@@ -298,7 +298,13 @@ class BleManager extends BleGattManager {
     };
 
     try {
-      UniversalBle.connect(device.id);
+      UniversalBle.connect(
+        device.id,
+        platformConfig: ConnectionPlatformConfig(
+          // A new Flutter engine cannot receive the old GATT client's callbacks.
+          android: AndroidConnectionOptions(closeGattOnDetach: true),
+        ),
+      );
     } catch (error, stack) {
       _connectCallbacks.remove(device.id);
       _disconnectCallbacks.remove(device.id);

pubspec.yaml

@@ -21,7 +21,7 @@ dependencies:
   typed_data: ^1.3.2
   convert: ^3.1.1
   permission_handler: ^12.0.1
-  universal_ble: ^2.0.1
+  universal_ble: ^2.3.0
   logger: ^2.5.0
   # for fota:
   equatable: ^2.0.5