func onKeepaliveAck(session *swnet.Session, packet protocol.Packet) {
fmt.Println("keepalive ack")
ack := packet.(*protocol.KeepaliveAck)
req := protocol.NewKeepalive()
req.Token = ack.Token + 1
req.Version = ack.Version
session.AsyncSend(req)
}
func onKeepalive(session *swnet.Session, packet protocol.Packet) {
fmt.Println("keepalive")
req := packet.(*protocol.Keepalive)
ack := protocol.NewKeepaliveAck()
ack.Token = req.Token
ack.Version = req.Version
session.AsyncSend(ack)
}