Home按键然后锁屏，socket断开连接问题处理（error code＝57）

add this to one of your xmppStream delegate's: 

- (void)xmppStream:(XMPPStream *)sender socketWillConnect:(AsyncSocket *)socket 
{ 
    // XMPPStream is preparing to connect. 
    // Add the voip flag to the socket. 

    CFReadStreamSetProperty([socket getCFReadStream], kCFStreamNetworkServiceType, kCFStreamNetworkServiceTypeVoIP); 
    CFWriteStreamSetProperty([socket getCFWriteStream], kCFStreamNetworkServiceType, kCFStreamNetworkServiceTypeVoIP); 

 

}