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The error code 4 is "Invalid License".
https://dev.proptt2.com/sdk-client-ref2-pttclient.html#onDisconnected
The license is depend on bundle name.
I guess you changed the bundle name.
You need to generate the license at https://dev.proptt2.com/account-generate.php
ProPTT2
			
May 26 '18 at 06:38  (GMT0) created by ProPTT2 dev