Allows to register an extended version for the start message.
Extended version supports the same than VortexOnStartChannel handler but also giving support for the profile requested, the serverName attribute, the profile content and the profile content encoding.
Most profile definitions doesn't need the extended version for the start message received. If the profile being implemented doesn't need the profile uri, the serverName, the profile content and the encoding you should use the start handler defined at vortex_profiles_register.
Once defined the extended handler, the start handler defined at vortex_profiles_register will be ignored.
|uri ||The uri profile to register the start channel extended |
|extended_start ||The handler to be invoked when an start message is received |
|extended_start_user_data ||User defined data to be passed in to the handler. |