Resolves #86

ios/TcpSocketClient.h

@@ -31,6 +31,10 @@ typedef enum RCTTCPError RCTTCPError;
 - (void)onData:(NSNumber *)clientID data:(NSData *)data;
 - (void)onClose:(TcpSocketClient*)client withError:(NSError *)err;
 - (void)onError:(TcpSocketClient*)client withError:(NSError *)err;
+- (NSNumber*)getNextTag;
+- (void)setPendingSend:(RCTResponseSenderBlock)callback forKey:(NSNumber *)key;
+- (RCTResponseSenderBlock)getPendingSend:(NSNumber *)key;
+- (void)dropPendingSend:(NSNumber *)key;
 - (NSNumber*)getNextId;
 
 @end

ios/TcpSocketClient.m

@@ -15,9 +15,6 @@ @interface TcpSocketClient()
 {
 @private
     GCDAsyncSocket *_tcpSocket;
-    NSMutableDictionary<NSNumber *, RCTResponseSenderBlock> *_pendingSends;
-    NSLock *_lock;
-    long _sendTag;
 }
 
 - (id)initWithClientId:(NSNumber *)clientID andConfig:(id<SocketClientDelegate>)aDelegate;
@@ -43,8 +40,6 @@ - (id)initWithClientId:(NSNumber *)clientID andConfig:(id<SocketClientDelegate>)
     if (self) {
         _id = clientID;
         _clientDelegate = aDelegate;
-        _pendingSends = [NSMutableDictionary dictionary];
-        _lock = [[NSLock alloc] init];
         _tcpSocket = tcpSocket;
         [_tcpSocket setUserData: clientID];
     }
@@ -134,58 +129,24 @@ - (BOOL)listen:(NSString *)host port:(int)port error:(NSError **)error
     return isListening;
 }
 
-- (void)setPendingSend:(RCTResponseSenderBlock)callback forKey:(NSNumber *)key
-{
-    [_lock lock];
-    @try {
-        [_pendingSends setObject:callback forKey:key];
-    }
-    @finally {
-        [_lock unlock];
-    }
-}
-
-- (RCTResponseSenderBlock)getPendingSend:(NSNumber *)key
-{
-    [_lock lock];
-    @try {
-        return [_pendingSends objectForKey:key];
-    }
-    @finally {
-        [_lock unlock];
-    }
-}
-
-- (void)dropPendingSend:(NSNumber *)key
-{
-    [_lock lock];
-    @try {
-        [_pendingSends removeObjectForKey:key];
-    }
-    @finally {
-        [_lock unlock];
-    }
-}
-
 - (void)socket:(GCDAsyncSocket *)sock didWriteDataWithTag:(long)msgTag
 {
     NSNumber* tagNum = [NSNumber numberWithLong:msgTag];
-    RCTResponseSenderBlock callback = [self getPendingSend:tagNum];
+    RCTResponseSenderBlock callback = [_clientDelegate getPendingSend:tagNum];
     if (callback) {
         callback(@[]);
-        [self dropPendingSend:tagNum];
+        [_clientDelegate dropPendingSend:tagNum];
     }
 }
 
 - (void) writeData:(NSData *)data
           callback:(RCTResponseSenderBlock)callback
 {
+    NSNumber *sendTag = [_clientDelegate getNextTag];
     if (callback) {
-        [self setPendingSend:callback forKey:@(_sendTag)];
+        [_clientDelegate setPendingSend:callback forKey:sendTag];
     }
-    [_tcpSocket writeData:data withTimeout:-1 tag:_sendTag];
-
-    _sendTag++;
+    [_tcpSocket writeData:data withTimeout:-1 tag:sendTag.longValue];
 
     [_tcpSocket readDataWithTimeout:-1 tag:_id.longValue];
 }

ios/TcpSockets.m

@@ -14,6 +14,15 @@
 // offset native ids by 5000
 #define COUNTER_OFFSET 5000
 
+@interface TcpSockets() {
+
+@private
+    NSMutableDictionary<NSNumber *, RCTResponseSenderBlock> *_pendingSends;
+    NSLock *_lock;
+    long _tag;
+}
+@end
+
 @implementation TcpSockets
 {
     NSMutableDictionary<NSNumber *,TcpSocketClient *> *_clients;
@@ -22,6 +31,23 @@ @implementation TcpSockets
 
 RCT_EXPORT_MODULE()
 
++ (BOOL)requiresMainQueueSetup {
+    return NO;
+}
+
+- (id)init {
+    self = [super init];
+    if (self) {
+        _pendingSends = [NSMutableDictionary dictionary];
+        _lock = [[NSLock alloc] init];
+    }
+    return self;
+}
+
+- (NSNumber*)getNextTag {
+    return [NSNumber numberWithLong:_tag++];
+}
+
 - (NSArray<NSString *> *)supportedEvents
 {
     return @[@"connect",
@@ -200,4 +226,38 @@ -(NSNumber*)getNextId {
     return @(_counter++ + COUNTER_OFFSET);
 }
 
+
+- (void)setPendingSend:(RCTResponseSenderBlock)callback forKey:(NSNumber *)key
+{
+    [_lock lock];
+    @try {
+        [_pendingSends setObject:callback forKey:key];
+    }
+    @finally {
+        [_lock unlock];
+    }
+}
+
+- (RCTResponseSenderBlock)getPendingSend:(NSNumber *)key
+{
+    [_lock lock];
+    @try {
+        return [_pendingSends objectForKey:key];
+    }
+    @finally {
+        [_lock unlock];
+    }
+}
+
+- (void)dropPendingSend:(NSNumber *)key
+{
+    [_lock lock];
+    @try {
+        [_pendingSends removeObjectForKey:key];
+    }
+    @finally {
+        [_lock unlock];
+    }
+}
+
 @end