When I configuring Twilio Android sample application from https://github.com/llSourcell/IPMQuickstart-Android and I got this error:
05-30 18:05:19.949: I/IPMessagingClient(native)(2780): 1431675320 | 05/30/18:05:19.961 | WARNING | 3 | TNNotificationClient | onTwilsockError: 0 - Poco ws exception while connecting: WebSocket Exception: Cannot upgrade to WebSocket connection: Capability tokens are not supported, TNNotificationClient
I am sure capability token generating very well.
How I can set IP Messaging Service SID
Downloaded and installed server app from https://www.twilio.com/docs/api/ip-messaging/guides/quickstart-js
Now application get access token very well.