diff --git a/android/src/main/kotlin/de/mintware/flutter_p2p/wifi_direct/SocketPool.kt b/android/src/main/kotlin/de/mintware/flutter_p2p/wifi_direct/SocketPool.kt
index 7ac4c60..c65987a 100644
--- a/android/src/main/kotlin/de/mintware/flutter_p2p/wifi_direct/SocketPool.kt
+++ b/android/src/main/kotlin/de/mintware/flutter_p2p/wifi_direct/SocketPool.kt
@@ -21,7 +21,8 @@ class SocketPool(private val inputStreamHandler: StreamHandler) {
     private val hosts = mutableListOf<Host>()
 
     fun openSocket(port: Int): Host {
-        if (getHostByPort(port) != null) {
+        val h = getHostByPort(port);
+        if (h != null && !h.serverSocket.isClosed) {
             throw Exception("A socket with this port already exist")
         }
 
@@ -43,6 +44,7 @@ class SocketPool(private val inputStreamHandler: StreamHandler) {
         val socket: Host = getHostByPort(port)
                 ?: throw Exception("A socket with this port is not registered.")
         socket.serverSocket.close()
+        hosts.remove(socket);
     }
 
     fun connectToHost(address: String, port: Int, timeout: Int): Client {
diff --git a/example/pubspec.lock b/example/pubspec.lock
deleted file mode 100644
index eeee9b4..0000000
--- a/example/pubspec.lock
+++ /dev/null
@@ -1,209 +0,0 @@
-# Generated by pub
-# See https://dart.dev/tools/pub/glossary#lockfile
-packages:
-  archive:
-    dependency: transitive
-    description:
-      name: archive
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.13"
-  args:
-    dependency: transitive
-    description:
-      name: args
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.6.0"
-  async:
-    dependency: transitive
-    description:
-      name: async
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.4.1"
-  boolean_selector:
-    dependency: transitive
-    description:
-      name: boolean_selector
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.0"
-  charcode:
-    dependency: transitive
-    description:
-      name: charcode
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.1.3"
-  collection:
-    dependency: transitive
-    description:
-      name: collection
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.14.12"
-  convert:
-    dependency: transitive
-    description:
-      name: convert
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.1.1"
-  crypto:
-    dependency: transitive
-    description:
-      name: crypto
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.1.4"
-  cupertino_icons:
-    dependency: "direct main"
-    description:
-      name: cupertino_icons
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.1.2"
-  fixnum:
-    dependency: transitive
-    description:
-      name: fixnum
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.10.9"
-  flutter:
-    dependency: "direct main"
-    description: flutter
-    source: sdk
-    version: "0.0.0"
-  flutter_p2p:
-    dependency: "direct dev"
-    description:
-      path: ".."
-      relative: true
-    source: path
-    version: "1.0.0"
-  flutter_test:
-    dependency: "direct dev"
-    description: flutter
-    source: sdk
-    version: "0.0.0"
-  image:
-    dependency: transitive
-    description:
-      name: image
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.1.12"
-  matcher:
-    dependency: transitive
-    description:
-      name: matcher
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.12.6"
-  meta:
-    dependency: transitive
-    description:
-      name: meta
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.1.8"
-  path:
-    dependency: transitive
-    description:
-      name: path
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.6.4"
-  petitparser:
-    dependency: transitive
-    description:
-      name: petitparser
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.4.0"
-  protobuf:
-    dependency: transitive
-    description:
-      name: protobuf
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.0.0"
-  quiver:
-    dependency: transitive
-    description:
-      name: quiver
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.1.3"
-  sky_engine:
-    dependency: transitive
-    description: flutter
-    source: sdk
-    version: "0.0.99"
-  source_span:
-    dependency: transitive
-    description:
-      name: source_span
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.7.0"
-  stack_trace:
-    dependency: transitive
-    description:
-      name: stack_trace
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.9.3"
-  stream_channel:
-    dependency: transitive
-    description:
-      name: stream_channel
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.0"
-  string_scanner:
-    dependency: transitive
-    description:
-      name: string_scanner
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.0.5"
-  term_glyph:
-    dependency: transitive
-    description:
-      name: term_glyph
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.1.0"
-  test_api:
-    dependency: transitive
-    description:
-      name: test_api
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.2.15"
-  typed_data:
-    dependency: transitive
-    description:
-      name: typed_data
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.1.6"
-  vector_math:
-    dependency: transitive
-    description:
-      name: vector_math
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.8"
-  xml:
-    dependency: transitive
-    description:
-      name: xml
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "3.6.1"
-sdks:
-  dart: ">=2.6.0 <3.0.0"
diff --git a/pubspec.yaml b/pubspec.yaml
index cd098bc..e0119ab 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -14,15 +14,9 @@ dependencies:
   flutter:
     sdk: flutter
 
-dev_dependencies:
-  flutter_test:
-    sdk: flutter
-
-# For information on the generic Dart part of this file, see the
-# following page: https://dart.dev/tools/pub/pubspec
-
 flutter:
   plugin:
-    android:
-      package: de.mintware.flutter_p2p
-      pluginClass: FlutterP2pPlugin
\ No newline at end of file
+    platforms:
+      android:
+        package: de.mintware.flutter_p2p
+        pluginClass: FlutterP2pPlugin