OpenVPN: Tunnel stuck on network down

[keeshux]

Tunnel got stuck indefinitely after shutting down the Wi-Fi hotspot. Reconnected only after changing network, but no messages about data count or ping before.

Can also reproduce by:

• Connect to VPN via hotspot
• Open Console to observe PassepartoutTunnel
• Close Mac until sleep
• Open Mac, will wake up without network
• Console is stuck until connecting to a new network
  • Tunnel is "blocked", i.e. await-ing on link write
  • No data count message because it's not a timer, it's logged on data in/out

---

debug	12:35:03.962516+0100	PassepartoutTunnel	Run ping check
info	12:35:03.962515+0100	PassepartoutTunnel	Cancelled OCCPacket
debug	12:35:03.962686+0100	PassepartoutTunnel	Send ping
debug	12:35:03.962973+0100	PassepartoutTunnel	Updated data count: {in=14044715, out=5037224}
debug	12:35:03.964452+0100	PassepartoutTunnel	AppGroupEnvironment.set(PassepartoutKit.dataCount) -> {in=14044715, out=5037224}

Yep, blocking link write, then after connecting to a network:

error	12:37:20.854224+0100	PassepartoutTunnel	Data: Failed LINK write during send data: Error Domain=NSPOSIXErrorDomain Code=49 "Can't assign requested address"