I try to connect to websocket server and send some messages, using NSURLSessionWebSocketTask.
Here is my demo code. This code works well on iOS 13. The Xcode that I uses is Version 12.0 beta 2 (12A6163b)
But the websocket is disconnected automatically (with the close code of NSURLSessionWebSocketCloseCodeProtocolError = 1002) a few seconds after the connection is created on iOS 14 beta2.
If I send short messages (e.g the message length < 10), iOS 14 beta2 might have much better chance to keep the websocket connection
Here is the log in the console
Here is my demo code. This code works well on iOS 13. The Xcode that I uses is Version 12.0 beta 2 (12A6163b)
But the websocket is disconnected automatically (with the close code of NSURLSessionWebSocketCloseCodeProtocolError = 1002) a few seconds after the connection is created on iOS 14 beta2.
If I send short messages (e.g the message length < 10), iOS 14 beta2 might have much better chance to keep the websocket connection
Code Block objective-c @interface ViewController () <NSURLSessionWebSocketDelegate, NSURLSessionDelegate> @property (weak, nonatomic) IBOutlet UITextField *outgoing; @property (weak, nonatomic) IBOutlet UITextView *incoming; @property (nonatomic) NSURLSession* session; @property (nonatomic) NSURLSessionWebSocketTask* task; @property (nonatomic) dispatch_queue_t queue; @property (nonatomic) NSOperationQueue* operationQueue; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; NSURLSessionConfiguration* sc = [NSURLSessionConfiguration defaultSessionConfiguration]; self.queue= dispatch_queue_create("WebSocket", DISPATCH_QUEUE_SERIAL); self.operationQueue = [[NSOperationQueue alloc] init]; self.operationQueue.maxConcurrentOperationCount = 1; self.operationQueue.underlyingQueue = self.queue; self.session = [NSURLSession sessionWithConfiguration:sc delegate:self delegateQueue:self.operationQueue]; self.task = [self.session webSocketTaskWithURL:[NSURL URLWithString:@"wss://echo.websocket.org/"]]; [self.task resume]; [self _runReadLoop]; } - (IBAction)onSend:(id)sender { block NSUInteger index = 0; [NSTimer scheduledTimerWithTimeInterval:0.5 repeats:YES block:^(NSTimer * _Nonnull timer) { NSUInteger i = index; NSURLSessionWebSocketMessage* message = [[NSURLSessionWebSocketMessage alloc] initWithString:[NSString stringWithFormat:@"The first section of this page will let you do an HTML5 WebSocket test against the echo server. The second section walks you through creating a WebSocket application yourself - %@", @(i)]]; [self.task sendMessage:message completionHandler:^(NSError* error) { if (error) { NSLog(@"send error: %@, %@", @(i), error); } else { NSLog(@"send: %@, %@", @(i), @(message.string.length)); } }]; index; }]; } - (void) _runReadLoop { [self.task receiveMessageWithCompletionHandler:^(NSURLSessionWebSocketMessage* message, NSError* error) { if (error) { NSLog(@"recv error: %@", error); return; } dispatch_async(dispatch_get_main_queue(), ^{ self.incoming.text = [NSString stringWithFormat:@"%@\n%@",self.incoming.text, message.string]; [self _runReadLoop]; }); }]; } #pragma mark - NSURLSessionDelegate - (void)URLSession:(NSURLSession*)session didBecomeInvalidWithError:(NSError*)error { NSLog(@"Session Invalidated: %@", error); } - (void)URLSession:(NSURLSession*)session task:(NSURLSessionTask*)task didCompleteWithError:(NSError*)error { NSLog(@"Task Completed: %@, %@", task, error); } #pragma mark - NSURLSessionStreamDelegate - (void)URLSession:(NSURLSession*)session webSocketTask:(NSURLSessionWebSocketTask*)task didOpenWithProtocol:(NSString*)protocol { NSLog(@"WebSocket Closed: %@, %@", task, protocol); } - (void)URLSession:(NSURLSession*)session webSocketTask:(NSURLSessionWebSocketTask*)task didCloseWithCode:(NSURLSessionWebSocketCloseCode)closeCode reason:(NSData*)reason { NSLog(@"WebSocket Closed: %@, %ld, %@", task, (long)closeCode, reason); } @end
Here is the log in the console
Code Block language 2020-07-08 23:35:56.597508+0800 WebSocketDemo[420:32598] libMobileGestalt MobileGestaltCache.c:166: Cache loaded with 4563 pre-cached in CacheData and 53 items in CacheExtra. 2020-07-08 23:36:02.645074+0800 WebSocketDemo[420:32600] WebSocket Closed: LocalWebSocketTask <07DE69E4-CDEA-4DD3-AC0A-40EE33A60C37>.<1>, (null) 2020-07-08 23:36:11.609142+0800 WebSocketDemo[420:32594] send: 0, 178 2020-07-08 23:36:12.831746+0800 WebSocketDemo[420:32594] [connection] nw_read_request_report [C1] Receive failed with error "Socket is not connected" 2020-07-08 23:36:12.837520+0800 WebSocketDemo[420:32594] Connection 1: received failure notification 2020-07-08 23:36:12.838900+0800 WebSocketDemo[420:32597] recv error: Error Domain=NSPOSIXErrorDomain Code=57 "Socket is not connected" UserInfo={NSErrorFailingURLStringKey=https://echo.websocket.org/, NSErrorFailingURLKey=https://echo.websocket.org/} 2020-07-08 23:36:12.839745+0800 WebSocketDemo[420:32753] [connection] nw_connection_copy_connected_local_endpoint [C1] Connection has no connected path 2020-07-08 23:36:12.839931+0800 WebSocketDemo[420:32753] [connection] nw_connection_copy_connected_remote_endpoint [C1] Connection has no connected path 2020-07-08 23:36:12.884086+0800 WebSocketDemo[420:32594] WebSocket Closed: LocalWebSocketTask <07DE69E4-CDEA-4DD3-AC0A-40EE33A60C37>.<1>, 1002, (null) 2020-07-08 23:36:12.884914+0800 WebSocketDemo[420:32594] Task Completed: LocalWebSocketTask <07DE69E4-CDEA-4DD3-AC0A-40EE33A60C37>.<1>, (null)
