(cl *Client, pk packets.Packet)
| 98 | OnUnsubscribed(cl *Client, pk packets.Packet) |
| 99 | OnPublish(cl *Client, pk packets.Packet) (packets.Packet, error) |
| 100 | OnPublished(cl *Client, pk packets.Packet) |
| 101 | OnPublishDropped(cl *Client, pk packets.Packet) |
| 102 | OnRetainMessage(cl *Client, pk packets.Packet, r int64) |
| 103 | OnRetainPublished(cl *Client, pk packets.Packet) |