func (b *BasicApplication) SendEchoReply(dpid string) {
req := ofp10.NewEchoReply()
s, ok := GetSwitch(dpid)
if ok {
<-time.After(time.Second * 1)
s.Send(req)
}
}
func (o *OgoInstance) EchoRequest(dpid net.HardwareAddr) {
// Wait three seconds then send an echo_reply message.
go func() {
<-time.After(time.Second * 3)
if sw, ok := Switch(dpid); ok {
res := ofp10.NewEchoReply()
sw.Send(res)
}
}()
}