macos app: add wake & sleep handler

[iwanbk]

The ping become failed when the app put to sleep. (It is expected).

app state

ping side

But the ping didn't instantly recovered after the app wake up again (not expected) app state

ping side

The recovery time varied, sometimes almost instantly but sometimes more than 10 minutes. The long recovery was noticed when the battery is low (< 20%)

One of the quick solution is to restart the mycelium after wake up.

[iwanbk]

One of the quick solution is to restart the mycelium after wake up.

I have tried these things:

1. restart mycelium from within the PacketTunnelProvider, but didn't work. Some observation:

   • Stopping the tunnel doesnt tearing down the TUN device
   • Starting the tunnel failed to get TUN device. We got errno 9 ( EBADF: Bad file descriptor)

2. Add sleep and wake up handler to macos NSWindow

   • it still doesn't work, we don't get wake & sleep event notification
   • why we do this? the only difference with current restart is that current restart is triggered from the NSWindow, not within PacketTunnelProvider

[iwanbk]

i found that restarting mycelium outside the PacketTunnelProvider works perfectly. I use https://pub.dev/packages/flutter_desktop_sleep to detect wake event and do the restart.

[iwanbk]

I also found that the problem might be in mycelium itself because:

• got this log on macos side : on minutes 28:26

  "Frame error from TCP 192.168.1.6:55080 <-> 68.183.228.64:9651: Connection reset by peer (os error 54)

  on minutes 28:31

  Connected to new peer

• it already connected to the public node

  2024-10-02T07:28:31.439602Z  INFO mycelium::peer_manager: Accepted new inbound peer
  2024-10-02T07:28:31.439650Z  INFO add_peer: mycelium::peer_manager: Added new peer peer.endpoint=Tcp [::ffff:36.80.99.115]:55229
  2024-10-02T07:28:31.464380Z  INFO mycelium::router: Acquired route subnet=525:c933:ef2e:bfe7::/64 peer="TCP [::ffff:68.183.228.64]:9651 <-> [::ffff:36.80.99.115]:55229"

• the connection recovered consistently much faster on my own public node. log on my Linux

  024-10-02T07:30:38.961313Z  INFO mycelium::router: Acquired route subnet=525:c933:ef2e:bfe7::/64 peer="TCP 192.168.0.108:53200 <-> 68.183.228.64:9651"

  it only take ~2 minutes versus > 10 minutes on mycelium public node, sometimes almost instantly

[iwanbk]

fixed at #71