Expose dataChannel for e2e testing. (#161)

example/pubspec.lock

@@ -105,7 +105,7 @@ packages:
       name: dart_webrtc
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.7"
+    version: "1.0.8"
   dbus:
     dependency: transitive
     description:
@@ -232,7 +232,7 @@ packages:
       name: flutter_webrtc
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.4"
+    version: "0.9.6"
   google_fonts:
     dependency: "direct main"
     description:
@@ -573,7 +573,7 @@ packages:
       name: webrtc_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.7"
+    version: "1.0.8"
   win32:
     dependency: transitive
     description:

lib/src/core/engine.dart

@@ -43,6 +43,10 @@ class Engine extends Disposable with EventsEmittable<EngineEvent> {
   @internal
   Transport? get primary => _subscriberPrimary ? subscriber : publisher;
 
+  rtc.RTCDataChannel? get dataChannel => _subscriberPrimary
+      ? _reliableDCSub ?? _lossyDCSub
+      : _reliableDCPub ?? _lossyDCPub;
+
   // data channels for packets
   rtc.RTCDataChannel? _reliableDCPub;
   rtc.RTCDataChannel? _lossyDCPub;
@@ -110,6 +114,11 @@ class Engine extends Disposable with EventsEmittable<EngineEvent> {
     this.roomOptions = roomOptions ?? this.roomOptions;
     this.fastConnectOptions = fastConnectOptions;
 
+    if (connectionState == ConnectionState.connected) {
+      logger.fine('already connected');
+      return;
+    }
+
     _updateConnectionState(ConnectionState.connecting);
 
     try {

pubspec.lock

@@ -161,7 +161,7 @@ packages:
       name: dart_webrtc
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.7"
+    version: "1.0.8"
   dbus:
     dependency: transitive
     description:
@@ -267,7 +267,7 @@ packages:
       name: flutter_webrtc
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.9.4"
+    version: "0.9.6"
   glob:
     dependency: transitive
     description:
@@ -559,7 +559,7 @@ packages:
       name: webrtc_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.7"
+    version: "1.0.8"
   win32:
     dependency: transitive
     description:

pubspec.yaml

@@ -23,10 +23,10 @@ dependencies:
   uuid: ^3.0.6
   synchronized: ^3.0.0
   protobuf: ^2.0.1
-  flutter_webrtc: 0.9.4
+  flutter_webrtc: 0.9.6
-  dart_webrtc: 1.0.7
+  dart_webrtc: 1.0.8
   device_info_plus: ^3.2.3
-  webrtc_interface: 1.0.7
+  webrtc_interface: 1.0.8
 
 dev_dependencies:
   flutter_test: