Pangolin Connect: Local Connection to Newt

[spaceXrace]

Summary

When running Pangolin Connect on a device in the same network as my Newt instance, it would be great if the client connected to Newt locally.

Motivation

When in my home network where the homeserver with Newt is located, Pangolin Client currently chooses an awkward endpoint:

SITE            ENDPOINT              STATUS     LAST SEEN  RELAY
TrueNAS-Keller  209.198.153.229:6110  Connected  3s ago     false

209.198.152.229 is the shared exit IP from my ISP's CGNAT! It seems like a NAT Loopback is happening on the CGNAT side.

This route is unstable and slow:

[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  2.62 MBytes  2.20 Mbits/sec    5            sender
[  5]   0.00-10.43  sec  2.25 MBytes  1.81 Mbits/sec                  receiver

Proposed Solution

Pangolin Client should instead first try to reach the Newt Instance locally.

Current behaviour seems to be:

1. Try direct connection to Newt's public IP
2. Connect through Relay

Proposed behaviour:

1. Try local connection to Newt's local IP
2. Try direct connection to Newt's public IP
3. Connect through Relay

I have used Tailscale and Netbird before, their client apps both switch to a local connection when I am in my home network.

Alternatives Considered

No response

Additional Context

No response

[spaceXrace]

Seems like this was implemented in 1.21, thanks!