Hi, I have successfully created connection to Apple MFi printer, but I'm failed to have NSOutputStream to write to the printer because delegate did not called. Here is my LibPrint.h:- #import <Foundation/Foundation.h> #import <ExternalAccessory/ExternalAccessory.h> #import "FlashRuntimeExtensions.h" @Interface LibPrint : NSObject <NSStreamDelegate> - (void)printR; - (void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent; @End // C interface FREObject fncPrintR(FREContext ctx, void* funcData, uint32_t argc, FREObject argv[]); LibPrint.m:- #import "LibPrint.h" @Interface LibPrint () @property (nonatomic, strong) EASession *easPrinter; @property (nonatomic, strong) NSData *datPrintData; @End @implementation LibPrint FREContext eventContext; LibPrint *AirInAppRefToSelf; #pragma mark - NSObject -(id)init {     self = [super init];     if (self)     {         AirInAppRefToSelf = self;         self.easPrinter = nil;         self.datPrintData = nil;     }     return self; } -(void)dealloc {     self.easPrinter = nil;     self.datPrintData = nil;     AirInAppRefToSelf = nil; } #pragma mark - ANE setup void LibPrintExtContextInitializer(void* extData, const uint8_t* ctxType, FREContext ctx, uint32_t* numFunctionsToTest, const FRENamedFunction** functionsToSet) {     *numFunctionsToTest = 1;     FRENamedFunction* func = (FRENamedFunction*) malloc(sizeof(FRENamedFunction) * *numFunctionsToTest);     func[0].name = (const uint8_t*) "printR";     func[0].functionData = NULL;     func[0].function = &fncPrintR;     *functionsToSet = func;     eventContext = ctx;     if ((LibPrint*) AirInAppRefToSelf == nil)     {         AirInAppRefToSelf = [[LibPrint alloc] init];     } } void LibPrintContextFinalizer(FREContext ctx) { } void LibPrintExtensionInitializer(void** extDataToSet, FREContextInitializer* ctxInitializerToSet, FREContextFinalizer* ctxFinalizerToSet) {     *extDataToSet = NULL;     *ctxInitializerToSet = &LibPrintExtContextInitializer;     *ctxFinalizerToSet = &LibPrintContextFinalizer; } void LibPrintFinalizer(void* extData) { } #pragma mark - C interface FREObject fncPrintR(FREContext ctx, void* funcData, uint32_t argc, FREObject argv[]) {     FREObject result = NULL;     if ([AirInAppRefToSelf datPrintData] != nil) {         [AirInAppRefToSelf setDatPrintData:nil];     }     // Retrieve message     NSData *ldatPrintData = toNSDataByteArray(argv[0]);     [AirInAppRefToSelf setDatPrintData:ldatPrintData];     [(LibPrint*) AirInAppRefToSelf printR];         return result; } - (void)printR {     BOOL lblnConnected = false;     BOOL lblnFound = false;     NSArray *accessories = [EAAccessoryManager sharedAccessoryManager].connectedAccessories;     for (EAAccessory *accessory in accessories)     {         if (accessory.connected)         {             lblnConnected = true;             for (NSString *protocol in accessory.protocolStrings)             {                 if ([protocol isEqualToString:@"jp.star-m.starpro"])                 {                     lblnFound = true;                     [self setEasPrinter:[[EASession alloc] initWithAccessory:accessory forProtocol:protocol]];                     [[self easPrinter].outputStream setDelegate:self];                     [[self easPrinter].outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];                     [[self easPrinter].outputStream open];                 }             }         }     }     FREDispatchStatusEventAsync(eventContext, (uint8_t*)"DEBUG_DATA", (uint8_t*) [[NSString stringWithFormat: @"connected: %s", lblnConnected ? "true" : "false"]  UTF8String]);     FREDispatchStatusEventAsync(eventContext, (uint8_t*)"DEBUG_DATA", (uint8_t*) [[NSString stringWithFormat: @"found: %s", lblnFound ? "true" : "false"]  UTF8String]); } - (void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent {     FREDispatchStatusEventAsync(eventContext, (uint8_t*)"DEBUG_DATA", (uint8_t*) [@"NSStreamDelegate"  UTF8String]);     switch (streamEvent)     {         case NSStreamEventNone:         {             break;         }         case NSStreamEventOpenCompleted:         {             break;         }         case NSStreamEventHasBytesAvailable:         {             break;         }         case NSStreamEventHasSpaceAvailable:         {             FREDispatchStatusEventAsync(eventContext, (uint8_t*)"DEBUG_DATA", (uint8_t*) [@"NSStreamEventHasSpaceAvailable"  UTF8String]);             NSInteger len = [[self easPrinter].outputStream write:[[self datPrintData] bytes] maxLength:[[self datPrintData] length]];             FREDispatchStatusEventAsync(eventContext, (uint8_t*)"DEBUG_DATA", (uint8_t*) [[NSString stringWithFormat: @"data len: %ld, returned len: %ld", [[self datPrintData] length], len]  UTF8String]);             break;         }         case NSStreamEventErrorOccurred:         {             break;         }         case NSStreamEventEndEncountered:         {             break;         }     } } NSData *toNSDataByteArray(FREObject *ba) {     FREByteArray byteArray;     FREAcquireByteArray(ba, &byteArray);     NSData *d = [NSData dataWithBytes:(void *)byteArray.bytes length:(NSUInteger)byteArray.length];     FREReleaseByteArray(ba);     return d; } @End I have printer connected good, but the delegate method [- (void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent] never run. I guess maybe the currentRunLoop issue, I tried to change it to mainRunLoop, but still no clue. Please help, thanks in advanced! ... View more