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POGCDasyncUdpSocket can't reveive packets after changing from broadcast to unicast mode
 

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  1. POGCDasyncUdpSocket can't reveive packets after changing from broadcast to unicast mode
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    <p>Developing an iPAD app which communicates via WiFi to a UDP to serial converter. App starts out in broadcast mode and retrieves a list of responding units (requestPodIds). The received data maps a SN to the units IP address. The selected IP address is then used to communicate point-to-point between the iPad and the UDP/serial converter.</p> <p>My code works fine on the broadcast communications. And the unicast message I send out (requestStatus) to the units IP address is being received by the converter and it is responding as expected. However, I do not get any data back into the didReceiveData method.</p> <p>I do not understand why I am not getting the data back in the method:</p> <pre><code>- (void)udpSocket:(GCDAsyncUdpSocket *)sock didReceiveData:(NSData *)data fromAddress:(NSData *)address withFilterContext:(id)filterContext </code></pre> <p>My socket connections are located in the AppDelegate and the calls are mode from a viewController.</p> <pre>Buttons on viewController are pressed as follows: 1. button1Click 2. button2Click; this calls requestPodIds; works fine; data returned which fills ten other button labels with pod ids; one is clicked;<p> 3. getPodIdsClick; this loads the IP address of the UDP/Serial converter;<p> 4. getStatusClick; this is where the problem occurs. The UDP message goes out, the UDP converter receives the message and responds, I never see the response data in didReceiveData. </pre> <p>AppDelegate code:</p> <pre><code> - (int) udpServiceStart { NSError * UDPError; if(GCDUdpSocket == nil) { GCDUdpSocket = [[GCDAsyncUdpSocket alloc] initWithDelegate:self delegateQueue:dispatch_get_main_queue()]; } GCDUdpSocket.delegate = self; [GCDUdpSocket setIPv4Enabled:YES]; [GCDUdpSocket setIPv6Enabled:NO]; [GCDUdpSocket enableBroadcast:YES error:&amp;UDPError]; if (![GCDUdpSocket bindToPort:udpPort error:&amp;UDPError]) { NSLog(@"Error starting server (bind): %@", UDPError); return -1; } if (![GCDUdpSocket beginReceiving:&amp;UDPError]) // if (![GCDUdpSocket receiveOnce:&amp;UDPError]) { [GCDUdpSocket close]; NSLog(@"Error starting server (recv): %@", UDPError); return -1; } NSLog(@"UDP Link started on port %hu", [GCDUdpSocket localPort]); return 0; } - (void) connectToPodAtAddress: (NSString *) ipAddress { NSError * UDPError; [GCDUdpSocket enableBroadcast:NO error:&amp;UDPError]; podIp = ipAddress; // if (![GCDUdpSocket connectToHost:podIp onPort:udpPort error:&amp;UDPError]) // { // [GCDUdpSocket close]; // NSLog(@"Error connecting to host: %@", UDPError); // return; // } // if (![GCDUdpSocket beginReceiving:&amp;UDPError]) // // if (![GCDUdpSocket receiveOnce:&amp;UDPError]) // { // [GCDUdpSocket close]; // NSLog(@"Error starting server (recv): %@", UDPError); // return; // } } - (void)udpSocket:(GCDAsyncUdpSocket *)sock didReceiveData:(NSData *)data fromAddress:(NSData *)address withFilterContext:(id)filterContext { // NSError * UDPError; NSString *msg = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; if (msg) { NSLog(@"RCV: %@", msg); if(!commandBuffer) commandBuffer = [[NSMutableString alloc] initWithString:@""]; // Append the current message portion to the total message [commandBuffer appendString:msg]; NSString * commands = [[NSString alloc] initWithString: commandBuffer]; NSInteger cr_index = [commands rangeOfString:@"\r"].location; if([commands rangeOfString:@"\r"].location == NSNotFound) { if([commands rangeOfString:@"~~~ds"].location != NSNotFound) { [commandBuffer setString:@""]; } } else { [self decodeMessage:commands]; } } else { NSString *host = nil; uint16_t thePort = 0; [GCDAsyncUdpSocket getHost:&amp;host port:&amp;thePort fromAddress:address]; NSLog(@"Unknown message from : %@:%hu", host, thePort); } // // Queue up to Read Next Message // // if (![GCDUdpSocket receiveOnce:&amp;UDPError]) // { // [GCDUdpSocket close]; // NSLog(@"Error starting server (recv): %@", UDPError); // return; // } } - (void)udpSendToHost:(NSString *)host onPort:(int) thePort theMessage: (NSString *) msg { NSData *data = [msg dataUsingEncoding:NSUTF8StringEncoding]; tag = 0; [GCDUdpSocket sendData:data toHost:host port:thePort withTimeout:-1 tag:tag]; NSLog(@"SENT message for tag (%i) to host %@:%i", (int)tag, host, thePort); NSLog(@"Message sent = (%@)", msg); } - (void) requestPodIds { #ifdef LOGFUNCTIONCALLS NSLog(logString,__FUNCTION__); #endif [podTable removeAllObjects]; // pod_table.Clear(); // Empty table of any previous responses if (GCDUdpSocket != nil) // null happens on startup if wireless adapter not found { // PodMessage to_pod = new PodMessage(PodCommands.ucget, PodParameters.serial_number); PodMessage *to_pod = [[PodMessage alloc] initWithCommand:ucget andParams:serial_number]; // int bytes = udp_socket.SendTo(Encoding.ASCII.GetBytes(to_pod.Message()), // new IPEndPoint(IPAddress.Broadcast, port)); [self udpSendToHost:podIp onPort:udpPort theMessage:to_pod.message]; // Debug.Assert(bytes == to_pod.Message().Length); } } - (void) requestStatus { if (GCDUdpSocket != nil) // null happens on startup if wireless adapter not found { // PodMessage to_pod = new PodMessage(PodCommands.ucget, PodParameters.serial_number); PodMessage *to_pod1 = [[PodMessage alloc] initWithCommand:ucget andParams:status_pod]; [self udpSendToHost:podIp onPort:udpPort theMessage:to_pod1.message]; // PodMessage *to_pod2 = [[PodMessage alloc] initWithCommand:ucget andParams:status_line0]; // [self udpSendToHost:podIp onPort:udpPort theMessage:to_pod2.message]; // PodMessage *to_pod3 = [[PodMessage alloc] initWithCommand:ucget andParams:status_line1]; // [self udpSendToHost:podIp onPort:udpPort theMessage:to_pod3.message]; // Debug.Assert(bytes == to_pod.Message().Length); } } </code></pre> <p>Access from the ViewController is as follows:</p> <pre><code>wifiTestAppDelegate *appDelegate; appDelegate = (wifiTestAppDelegate *)[[UIApplication sharedApplication] delegate]; - (IBAction)button1Click:(id)sender { [appDelegate udpServiceStart]; } - (IBAction)button2Click:(id)sender { if([GCDUdpSocket isClosed]) { NSLog(@"Socket is Closed!"); } else { if([GCDUdpSocket isConnected]) { NSLog(@"Socket is Connected! Can't Broadcast!"); } else { [appDelegate requestPodIds]; } } } - (IBAction)podSelectClick:(id)sender { NSLog(@"Button with label %@",((UIButton *)sender).titleLabel.text); NSLog(@"Button with tag %i",((UIButton *)sender).tag); // UIButton *button = (UIButton *)[self.view viewWithTag:buttonTag++]; // [button setTitle:[podTable objectForKey:key] forState:UIControlStateNormal]; NSString * ipAddress = [podTable objectForKey:((UIButton *)sender).titleLabel.text]; NSLog(@"IP Address = %@",ipAddress); podIp = ipAddress; pod_sn = ((UIButton *)sender).titleLabel.text; [appDelegate connectToPodAtAddress:ipAddress]; getStatusButton.hidden = NO; [selectPodButton setTitle:ipAddress forState:UIControlStateNormal]; } - (IBAction)getPodIdsClick:(id)sender { int buttonTag = 101; NSMutableArray * sortArray = [[NSMutableArray alloc] initWithCapacity:100]; if([podTable count] &gt; 0) { for (NSString *key in podTable) { [sortArray addObject:key]; } [sortArray sortUsingSelector:@selector(compare:)]; for(int i=0; i &lt; [podTable count]; i++) { UIButton *button = (UIButton *)[self.view viewWithTag:buttonTag++]; [button setTitle:[sortArray objectAtIndex:i] forState:UIControlStateNormal]; } } } - (IBAction)getStatusClick:(id)sender { [appDelegate requestStatus]; } </code></pre>
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