The function is deprecated, please use ConnAckPacket::getServerKeepAliveSec(). Server-requested override of the keep alive interval, in seconds. If null, the keep alive value sent by the client should be used.
This no longer does anything useful. Launch policy was added because of a mistake in the implementation that was attempting to chain two promises together.
Please use the full WithCustomAuthorizer function that includes tokenKeyName and tokenValue. This version is left for backwards compatibility purposes.