| hostId | Host ID. |
| connectionId | Connection ID. |
| notificationLevel | Defines how many free slots in the incoming queue should be available before [GlobalConfig.ConnectionReadyForSend] callback is triggered. |
| error | エラーコード |
bool Result, if false error will show error code.
This method allows you to specify that notifications callbacks should be called when Unity's networking can send more messages than defined in notificationLevel.
Should be called every time when you want to be notified in this event.