Wiki page https://github.com/crossbario/crossbar/wiki/Secure-WebSocket-and-HTTPS#ciphers have a note that “default configuration does not support Windows XP!”, but it also seems that none of these ciphers were supported on Android until Android 5.0 (http://developer.android.com/reference/javax/net/ssl/SSLEngine.html).
I have tried to connect to wss://demo.crossbar.io/ws using jawampa with different versions of Android and came to the conclusion that it will connect successfully only on Android 5.0.
Then, I’ve installed Crossbar and after I have added some ciphers to config I was able to connect to it using jawampa and Android 2.3.
I hope this will help someone.
Also, does demo.crossbar.io use default set of ciphers?