func doHandleEchoRequest(req of.Header, res of.Header, c *ofConn) error { glog.V(2).Infof("Received echo request from %v", c.node) res.SetXid(req.Xid()) err := c.WriteHeaders([]of.Header{res}) if err != nil { return err } c.Flush() glog.V(2).Infof("Sent echo reply to %v", c.node) return nil }