Can join & leave the call

lib/helpers/calls_helper.dart

@@ -0,0 +1,15 @@
+import 'package:comunic/helpers/websocket_helper.dart';
+
+/// Calls helper
+///
+/// @author Pierre Hubert
+
+class CallsHelper {
+  /// Join a call
+  static Future<void> join(int convID) async =>
+      ws("calls/join", {"convID": convID});
+
+  /// Leave a call
+  static Future<void> leave(int convID) async =>
+      ws("calls/leave", {"convID": convID});
+}

lib/ui/screens/call_screen.dart

@@ -1,3 +1,4 @@
+import 'package:comunic/helpers/calls_helper.dart';
 import 'package:comunic/helpers/conversations_helper.dart';
 import 'package:comunic/models/conversation.dart';
 import 'package:comunic/ui/widgets/comunic_back_button_widget.dart';
@@ -54,13 +55,23 @@ class _CallScreenState extends SafeState<CallScreen> {
       assert(_convName != null);
 
       setState(() {});
+
+      // Join the call
+      await CallsHelper.join(convID);
     } catch (e, stack) {
       print("Could not initialize call! $e\n$stack");
       setState(() => _error = true);
     }
   }
 
-  void _endCall() async {}
+  void _endCall() async {
+    try {
+      // Leave the call
+      await CallsHelper.leave(convID);
+    } catch (e, stack) {
+      print("Could not end call properly! $e\n$stack");
+    }
+  }
 
   @override
   Widget build(BuildContext context) {