Everybody, I've been learning on the above title in this way, and then encountered such a problem, when cell phones and computers have a not online, didn't connect WiFi (release webservice service with computers, cell phones and computers to be under the same WiFi), if this time I test app, click the connect button is unable to connect successfully, this is normal, but if I connect both of the same WiFi, click connection still not successful, must exit the app after you restart the connection can be successful, I think this is the reason why? How to solve