RealtimeMessage.presenceJoin constructor
Creates a presence join message announcing userInfo metadata in channel.
final msg = RealtimeMessage.presenceJoin('room:lobby', {'name': 'Alice', 'status': 'online'});
Implementation
factory RealtimeMessage.presenceJoin(String channel, Map<String, dynamic> userInfo) =>
RealtimeMessage(type: typePresenceJoin, channel: channel, payload: userInfo);