Fixed wait for TUN to come up

[Revertron]

So, the function waiting for TUN to come up never succeeds:

func waitForTUNUp(ch <-chan wgtun.Event) bool {
	t := time.After(time.Second * 5)
	for {
		select {
		case ev := <-ch:
			if ev == wgtun.EventUp {
				return true
			}
		case <-t:
			return false
		}
	}
}

I've tried the sleep for one second, and it works flawlessly on several PCs.

Another point - sometimes, if the service stop abruptly (in case of some errors) there is an old hidden device in the system, that we need to uninstall, and then create new.

[Revertron]

BTW, in RiV-mesh they've ditched the waiting for event too. And added a crutch:

		for i := 1; i < 10; i++ {
			if err = tun.setupAddress(addr); err != nil {
				tun.log.Errorln("Failed to set up TUN address:", err)
				log.Printf("waiting...")
				if i > 8 {
					return err
				} else {
					time.Sleep(time.Duration(2*i) * time.Second)
				}
			} else {
				break
			}
		}

[Revertron]

Maybe I'm blind, but I don't even see any events like TunUp in the sources:
https://github.com/WireGuard/wireguard-go/blob/master/tun/tun_windows.go
It's like they just notify on MTU change and that's all.

[neilalexander]

Maybe don't need so many logging lines.

[Revertron]

I've removed this line, but I think it is better to leave the others.

[neilalexander]

LGTM!