appId property
The App ID issued to you by Agora. See How to get the App ID.
Only users in apps with the same App ID can join the same channel and communicate with each other. Use an App ID to create only
one RtcEngine instance. To change your App ID, call destroy to destroy the current RtcEngine instance and then call createWithConfig
to create an RtcEngine instance with the new App ID.
Implementation
String? appId;