Show the other computers, and apply the ten-minute rule

Three pieces on top of the link:

**The network status window**, on the entry window's Window menu. A row
per station, this computer included the way N1MM shows it: number,
address, operator, band, mode, run, transmit, pass frequency, the last
message type, how long ago it arrived, the counts each way and the echo
round trip. A station that broadcast the wrong version is named under the
table in red — that is the one fault where everything looks connected
and nothing arrives. The box at the bottom sends a line of chat, and
Echo asks every station whether it is there.

**Where this station is** goes out once a second when it has changed.
The frequency, the mode and run have a dozen places they can change from
— the radio moving, a band button, a QSY typed into the callsign box —
so it is read and compared rather than announced from each of them.

**The ten-minute rule.** `BandChangeRules` already counted changes and
the stay on a band, and the entry window already showed the countdown,
but only a user-defined contest carried a rule, so every built-in
contest allowed anything. `ForCategory` gives a multi-operator entry
with one or two transmitters a ten-minute stay, which is N1MM's fallback
in `ContestInstance.BandChangeTimerDuration` for every contest that does
not name its own. Its per-contest table is a few hundred cases in a
decompiled hash switch and is not repeated.

Config ▸ Edit Networked-Computer Names now covers both networks: the
12060 broadcast to other programs and the 12070 link, with the station
number, the port, the version to claim and stations named by address for
a network where a broadcast does not reach.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PdAYHcdRktqKry7nk414TU

src/Nonemm.App/Dialogs/NetworkDialog.axaml

@@ -14,7 +14,23 @@
     </Grid>
     <TextBlock Text="Other stations, one address per line" FontSize="11" Opacity="0.7" Margin="0,6,0,1" />
     <TextBox Name="PeersBox" AcceptsReturn="True" Height="90" PlaceholderText="192.168.1.11" />
-    <CheckBox Name="EnabledBox" Content="Share contacts with the other stations" Margin="0,6,0,0" />
+    <CheckBox Name="EnabledBox" Content="Broadcast contacts to other programs (port 12060)" Margin="0,6,0,0" />
+    <TextBlock Text="The other logging computers" FontWeight="Bold" Margin="0,12,0,0" />
+    <TextBlock TextWrapping="Wrap" FontSize="11" Opacity="0.75"
+               Text="This is N1MM's own link between the computers of one entry, on port 12070: contacts, edits, deletes and chat, over a connection to each station. Stations are found by broadcast, so nothing has to be listed." />
+    <Grid ColumnDefinitions="90,8,110,8,*" RowDefinitions="Auto,Auto">
+      <TextBlock Text="Station number" FontSize="11" Opacity="0.7" Margin="0,6,0,1" />
+      <TextBox Name="StationNumberBox" Grid.Row="1" />
+      <TextBlock Grid.Column="2" Text="Port" FontSize="11" Opacity="0.7" Margin="0,6,0,1" />
+      <TextBox Name="LinkPortBox" Grid.Row="1" Grid.Column="2" />
+      <TextBlock Grid.Column="4" Text="Version to claim" FontSize="11" Opacity="0.7" Margin="0,6,0,1" />
+      <TextBox Name="VersionBox" Grid.Row="1" Grid.Column="4" />
+    </Grid>
+    <TextBlock TextWrapping="Wrap" FontSize="11" Opacity="0.75"
+               Text="N1MM turns away a station whose version is not its own, so this has to be the version the N1MM copies beside it are running. Help ▸ About in N1MM says which." />
+    <TextBlock Text="Stations to reach by address, one per line, as NAME@address" FontSize="11" Opacity="0.7" Margin="0,6,0,1" />
+    <TextBox Name="LinkPeersBox" AcceptsReturn="True" Height="60" PlaceholderText="RUN-PC@192.168.1.11" />
+    <CheckBox Name="LinkEnabledBox" Content="Share contacts with the other logging computers (port 12070)" Margin="0,6,0,0" />
     <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" Spacing="6" Margin="0,8,0,0">
       <Button Content="Cancel" Click="OnCancel" />
       <Button Content="Save" Click="OnSave" IsDefault="True" />

src/Nonemm.App/Dialogs/NetworkDialog.axaml.cs

@@ -18,6 +18,11 @@ public sealed partial class NetworkDialog : Window
         PortBox.Text = settings.NetworkPort.ToString();
         PeersBox.Text = string.Join("\n", settings.NetworkPeers);
         EnabledBox.IsChecked = settings.NetworkEnabled;
+        StationNumberBox.Text = settings.StationNumber.ToString();
+        LinkPortBox.Text = settings.StationLinkPort.ToString();
+        VersionBox.Text = settings.StationLinkVersion;
+        LinkPeersBox.Text = string.Join("\n", settings.StationLinkPeers);
+        LinkEnabledBox.IsChecked = settings.StationLinkEnabled;
     }
 
 
@@ -31,7 +36,23 @@ public sealed partial class NetworkDialog : Window
             .Where(l => l.Length > 0)
             .ToList(),
         NetworkEnabled = EnabledBox.IsChecked == true,
+        StationNumber = int.TryParse(StationNumberBox.Text, out int number)
+            ? Math.Clamp(number, 1, 99)
+            : settings.StationNumber,
+        StationLinkPort = int.TryParse(LinkPortBox.Text, out int linkPort)
+            ? linkPort
+            : settings.StationLinkPort,
+        StationLinkVersion = (VersionBox.Text ?? "").Trim(),
+        StationLinkPeers = Lines(LinkPeersBox.Text),
+        StationLinkEnabled = LinkEnabledBox.IsChecked == true,
     });
 
+    private static List<string> Lines(string? text) =>
+        (text ?? "")
+            .Split('\n', StringSplitOptions.RemoveEmptyEntries)
+            .Select(l => l.Trim())
+            .Where(l => l.Length > 0)
+            .ToList();
+
     private void OnCancel(object? sender, RoutedEventArgs e) => Close(null);
 }