hub_advertise_now command.

Resources/Locale/en-US/commands.ftl

@@ -551,3 +551,6 @@ cmd-dump_dependency_injectors-total-count = Total count: { $total }
 
 cmd-dump_netserializer_type_map-desc = Dump NetSerializer's type map and serializer hash.
 cmd-dump_netserializer_type_map-help = Usage: dump_netserializer_type_map
+
+cmd-hub_advertise_now-desc = Immediately advertise to the master hub server
+cmd-hub_advertise_now-help = Usage: hub_advertise_now

Robust.Server/ServerHub/AdvertiseNowCommand.cs

@@ -0,0 +1,16 @@
+using Robust.Shared.Console;
+using Robust.Shared.IoC;
+
+namespace Robust.Server.ServerHub;
+
+internal sealed class AdvertiseNowCommand : LocalizedCommands
+{
+    [Dependency] private readonly HubManager _hubManager = default!;
+
+    public override string Command => "hub_advertise_now";
+
+    public override void Execute(IConsoleShell shell, string argStr, string[] args)
+    {
+        _hubManager.AdvertiseNow();
+    }
+}

Robust.Server/ServerHub/HubManager.cs

@@ -60,6 +60,12 @@ internal sealed class HubManager
         _advertiseUrl = url;
     }
 
+    public void AdvertiseNow()
+    {
+        // Next heartbeat will immediately advertise to hub.
+        _nextPing = TimeSpan.Zero;
+    }
+
     private void UpdateInterval(int interval)
     {
         _interval = TimeSpan.FromSeconds(interval);