AsyncSocket just read once? - iphone

Question

I make simple client server with no CLRFdata, but i give header of message with lenght message self. this is my code :
This method send data
- (void)sendMessage:(NSString *)message {
unsigned char lendata = [message length];
senddata = [NSMutableData dataWithBytes: &lendata length:sizeof(lendata)] ;
[senddata appendData:[message dataUsingEncoding:NSUTF8StringEncoding]];
[socket writeData:senddata withTimeout:-1 tag:0];
}
This method read data from socket lenght = 1 byte until long of code on header.
- (void)onSocket:(AsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag {
NSString *message = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
if(bheader){
cdata++;
if(cdata==2){
[data getBytes:&idata];
bheader = NO;
cdata=0;
cmessage = [[NSString alloc] initWithFormat:#""];
}
}
else{
if (message){
cmessage = [[NSString alloc]initWithFormat:#"%#%#",cmessage,message] ;
}
else
NSLog(#"Error converting received data into UTF-8 String");
cdata++;
if(cdata==idata) {
msgComplete=YES;
}
}
if (msgComplete) {
NSDictionary *userInfo = [NSDictionary dictionaryWithObject:cmessage forKey:kNotificationMessage];
[notificationCenter postNotificationName:kNotification object:self userInfo:userInfo];
cmessage=#"";
msgComplete=NO;
bheader=YES;
cdata=0;
[cmessage release];
}
[sock readDataToLength:1 withTimeout:-1 tag:0];
}
and this method
- (void)onSocket:(AsyncSocket *)sock didWriteDataWithTag:(long)tag {
[sock readDataToLength:1 withTimeout:-1 tag:0];
}
I'm succes send data and recv data from server use this code,
i try make login and server got data and notification, and i recv message with this code, but after that i cant recv message from server when i send message again, but on TCPDUMP i see any message sent to server and server response with a message ?
could any one fix my code where the problem ?
Thanks.