Implement requestMtu in Linux (#22)

* Implement requestMtu in Linux

* Minor fixes

* Improve requestMtu

README.md

@@ -32,7 +32,7 @@ A cross-platform (Android/iOS/macOS/Windows/Linux/Web) Bluetooth Low Energy (BLE
 | onPairingStateChange |   ✔️    | ❌  |  ❌   |       ✔️       |      ✔️      | ❌  |
 | enableBluetooth      |   ✔️    | ❌  |  ❌   |       ✔️       |      ✔️      | ❌  |
 | onAvailabilityChange |   ✔️    | ✔️  |  ✔️   |       ✔️       |      ✔️      | ✔️  |
-| requestMtu           |   ✔️    | ✔️  |  ✔️   |       ✔️       |      🚧      | ❌  |
+| requestMtu           |   ✔️    | ✔️  |  ✔️   |       ✔️       |      ✔️      | ❌  |
 
 ## Getting Started
 

example/lib/data/capabilities.dart

@@ -11,7 +11,7 @@ class Capabilities {
 
   static bool supportsPairingApi = !_Platform.isWeb && !_Platform.isCupertino;
 
-  static bool supportsRequestMtuApi = !_Platform.isWeb && !_Platform.isLinux;
+  static bool supportsRequestMtuApi = !_Platform.isWeb;
 }
 
 class _Platform {

example/pubspec.lock

@@ -21,10 +21,10 @@ packages:
     dependency: transitive
     description:
       name: bluez
-      sha256: bfd004c81e3de0f06dce8580bc39a4600e4a6efe465a866b31d4d954c9f356aa
+      sha256: "203a1924e818a9dd74af2b2c7a8f375ab8e5edf0e486bba8f90a0d8a17ed9fce"
       url: "https://pub.dev"
     source: hosted
-    version: "0.8.1"
+    version: "0.8.2"
   boolean_selector:
     dependency: transitive
     description:
@@ -125,10 +125,10 @@ packages:
     dependency: transitive
     description:
       name: file
-      sha256: "5fc22d7c25582e38ad9a8515372cd9a93834027aacf1801cf01164dac0ffa08c"
+      sha256: "1b92bec4fc2a72f59a8e15af5f52cd441e4a7860b49499d69dfa817af20e925d"
       url: "https://pub.dev"
     source: hosted
-    version: "7.0.0"
+    version: "6.1.4"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -191,30 +191,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.6.7"
-  leak_tracker:
-    dependency: transitive
-    description:
-      name: leak_tracker
-      sha256: "78eb209deea09858f5269f5a5b02be4049535f568c07b275096836f01ea323fa"
-      url: "https://pub.dev"
-    source: hosted
-    version: "10.0.0"
-  leak_tracker_flutter_testing:
-    dependency: transitive
-    description:
-      name: leak_tracker_flutter_testing
-      sha256: b46c5e37c19120a8a01918cfaf293547f47269f7cb4b0058f21531c2465d6ef0
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.0.1"
-  leak_tracker_testing:
-    dependency: transitive
-    description:
-      name: leak_tracker_testing
-      sha256: a597f72a664dbd293f3bfc51f9ba69816f84dcd403cdac7066cb3f6003f3ab47
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.0.1"
   lints:
     dependency: transitive
     description:
@@ -235,34 +211,34 @@ packages:
     dependency: transitive
     description:
       name: matcher
-      sha256: d2323aa2060500f906aa31a895b4030b6da3ebdcc5619d14ce1aada65cd161cb
+      sha256: "1803e76e6653768d64ed8ff2e1e67bea3ad4b923eb5c56a295c3e634bad5960e"
       url: "https://pub.dev"
     source: hosted
-    version: "0.12.16+1"
+    version: "0.12.16"
   material_color_utilities:
     dependency: transitive
     description:
       name: material_color_utilities
-      sha256: "0e0a020085b65b6083975e499759762399b4475f766c21668c4ecca34ea74e5a"
+      sha256: "9528f2f296073ff54cb9fee677df673ace1218163c3bc7628093e7eed5203d41"
       url: "https://pub.dev"
     source: hosted
-    version: "0.8.0"
+    version: "0.5.0"
   meta:
     dependency: transitive
     description:
       name: meta
-      sha256: d584fa6707a52763a52446f02cc621b077888fb63b93bbcb1143a7be5a0c0c04
+      sha256: a6e590c838b18133bb482a2745ad77c5bb7715fb0451209e1a7567d416678b8e
       url: "https://pub.dev"
     source: hosted
-    version: "1.11.0"
+    version: "1.10.0"
   path:
     dependency: transitive
     description:
       name: path
-      sha256: "087ce49c3f0dc39180befefc60fdb4acd8f8620e5682fe2476afd0b3688bb4af"
+      sha256: "8829d8a55c13fc0e37127c29fedf290c102f4e40ae94ada574091fe0ff96c917"
       url: "https://pub.dev"
     source: hosted
-    version: "1.9.0"
+    version: "1.8.3"
   permission_handler:
     dependency: "direct main"
     description:
@@ -315,10 +291,10 @@ packages:
     dependency: transitive
     description:
       name: platform
-      sha256: "12220bb4b65720483f8fa9450b4332347737cf8213dd2840d8b2c823e47243ec"
+      sha256: ae68c7bfcd7383af3629daafb32fb4e8681c7154428da4febcff06200585f102
       url: "https://pub.dev"
     source: hosted
-    version: "3.1.4"
+    version: "3.1.2"
   plugin_platform_interface:
     dependency: transitive
     description:
@@ -331,10 +307,10 @@ packages:
     dependency: transitive
     description:
       name: process
-      sha256: "21e54fd2faf1b5bdd5102afd25012184a6793927648ea81eea80552ac9405b32"
+      sha256: "53fd8db9cec1d37b0574e12f07520d582019cb6c44abf5479a01505099a34a09"
       url: "https://pub.dev"
     source: hosted
-    version: "5.0.2"
+    version: "4.2.4"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -410,7 +386,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "0.9.3"
+    version: "0.9.4"
   vector_math:
     dependency: transitive
     description:
@@ -423,18 +399,26 @@ packages:
     dependency: transitive
     description:
       name: vm_service
-      sha256: b3d56ff4341b8f182b96aceb2fa20e3dcb336b9f867bc0eafc0de10f1048e957
+      sha256: c538be99af830f478718b51630ec1b6bee5e74e52c8a802d328d9e71d35d2583
       url: "https://pub.dev"
     source: hosted
-    version: "13.0.0"
+    version: "11.10.0"
+  web:
+    dependency: transitive
+    description:
+      name: web
+      sha256: afe077240a270dcfd2aafe77602b4113645af95d0ad31128cc02bce5ac5d5152
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.3.0"
   webdriver:
     dependency: transitive
     description:
       name: webdriver
-      sha256: "003d7da9519e1e5f329422b36c4dcdf18d7d2978d1ba099ea4e45ba490ed845e"
+      sha256: "3c923e918918feeb90c4c9fdf1fe39220fa4c0e8e2c0fffaded174498ef86c49"
       url: "https://pub.dev"
     source: hosted
-    version: "3.0.3"
+    version: "3.0.2"
   win32:
     dependency: transitive
     description:
@@ -460,5 +444,5 @@ packages:
     source: hosted
     version: "6.3.0"
 sdks:
-  dart: ">=3.2.0-0 <4.0.0"
+  dart: ">=3.2.0-194.0.dev <4.0.0"
   flutter: ">=3.10.0"

lib/src/universal_ble_linux/universal_ble_linux.dart

@@ -227,17 +227,16 @@ class UniversalBleLinux extends UniversalBlePlatform {
 
   @override
   Future<int> requestMtu(String deviceId, int expectedMtu) async {
-    // var device = _findDeviceById(deviceId);
-    // if (!device.connected) return 0;
-    // for (BlueZGattService service in device.gattServices) {
-    //   for (BlueZGattCharacteristic characteristic in service.characteristics) {
-    //     // The value provided by Bluez includes an extra 3 bytes from the GATT header, which needs to be removed.
-    //     // requires `int? get mtu => _object.getUint16Property(_gattCharacteristicInterfaceName, 'MTU');` to add in bluez.dart
-    //      return characteristic.mtu - 3;
-    //   }
-    // }
-    // return 0;
-    throw UnimplementedError();
+    var device = _findDeviceById(deviceId);
+    if (!device.connected) throw Exception('Device not connected');
+    for (BlueZGattService service in device.gattServices) {
+      for (BlueZGattCharacteristic characteristic in service.characteristics) {
+        int? mtu = characteristic.mtu;
+        // The value provided by Bluez includes an extra 3 bytes from the GATT header, which needs to be removed.
+        if (mtu != null) return mtu - 3;
+      }
+    }
+    throw Exception('MTU not available');
   }
 
   @override

pubspec.yaml

@@ -26,7 +26,7 @@ dependencies:
   collection: ^1.17.2
   convert: ^3.1.1
   flutter_web_bluetooth: ^0.2.2
-  bluez: ^0.8.1
+  bluez: ^0.8.2
 
 dev_dependencies:
   flutter_test: