Implement websocket

lib/services/brandmeister_client.dart

@@ -170,6 +170,20 @@ class BrandmeisterClient {
     }
   }
 
+  Future<void> dropAutoStaticGroup(int dmrId) async {
+    final response = await http.get(
+      Uri.parse('$baseUrl/device/$dmrId/action/dropAutoStaticGroup'),
+      headers: _headers,
+    );
+
+    if (response.statusCode < 200 || response.statusCode >= 300) {
+      throw BrandmeisterError(
+        'Failed to drop auto-static group: ${response.body}',
+        statusCode: response.statusCode,
+      );
+    }
+  }
+
   // Talkgroup Endpoints
   Future<Map<String, String>> getTalkgroups() async {
     final response = await http.get(