Thanks, I have report it, this is the id FB15933566 (SoftAP AP and STA modes coexist. When the band is switched, the Wi-Fi connection is disconnected.) For the socket, we use CocoaAsyncSocket, very simple code, like below: - (void)connect { NSString *host = @"192.168.42.1"; uint16_t port = 6666; NSError *error = nil; if (![self.asyncSocket connectToHost:host onPort:port error:&error]) { NSLog(@"Error connecting: %@", error); } }