getLastDeliveredMessageId static method 
    
      
Future<int?>
getLastDeliveredMessageId(
{ - dynamic onSuccess( - int lastMessageId
 )?,
}) 
    
    
  Implementation
  static Future<int?> getLastDeliveredMessageId(
    {Function(int lastMessageId)? onSuccess}) async {
  try {
    var result = await channel.invokeMethod('getLastDeliveredMessageId', {});
    if (onSuccess != null) onSuccess(result);
    return result;
  } on PlatformException catch (p) {
    _errorCallbackHandler(null, p, null, null);
    return null;
  } catch (e) {
    _errorCallbackHandler(null, null, e, null);
    return null;
  }
}