Predict two-way levers (#25043)

* Predict two-way levers

Annoys me the rare occasions I touch cargo. Doesn't predict the signal but at least the lever responds immediately.

* space

* a

Content.Shared/DeviceLinking/SharedDeviceLinkSystem.cs

@@ -1,6 +1,7 @@
 using Content.Shared.Administration.Logs;
 using Content.Shared.Database;
 using Content.Shared.DeviceLinking.Events;
+using Content.Shared.DeviceNetwork;
 using Content.Shared.Popups;
 using Robust.Shared.Prototypes;
 using Robust.Shared.Utility;
@@ -148,6 +149,9 @@ public abstract class SharedDeviceLinkSystem : EntitySystem
     /// </summary>
     public void EnsureSourcePorts(EntityUid uid, params string[] ports)
     {
+        if (ports.Length == 0)
+            return;
+
         var comp = EnsureComp<DeviceLinkSourceComponent>(uid);
         comp.Ports ??= new HashSet<string>();
 
@@ -163,6 +167,9 @@ public abstract class SharedDeviceLinkSystem : EntitySystem
     /// </summary>
     public void EnsureSinkPorts(EntityUid uid, params string[] ports)
     {
+        if (ports.Length == 0)
+            return;
+
         var comp = EnsureComp<DeviceLinkSinkComponent>(uid);
         comp.Ports ??= new HashSet<string>();
 
@@ -550,4 +557,20 @@ public abstract class SharedDeviceLinkSystem : EntitySystem
                 ("machine2", sinkUid), ("port2", PortName<SinkPortPrototype>(sink))), userId.Value, PopupType.Medium);
     }
     #endregion
+
+    #region Sending & Receiving
+    /// <summary>
+    /// Sends a network payload directed at the sink entity.
+    /// Just raises a <see cref="SignalReceivedEvent"/> without data if the source or the sink doesn't have a <see cref="DeviceNetworkComponent"/>
+    /// </summary>
+    /// <param name="uid">The source uid that invokes the port</param>
+    /// <param name="port">The port to invoke</param>
+    /// <param name="data">Optional data to send along</param>
+    /// <param name="sourceComponent"></param>
+    public virtual void InvokePort(EntityUid uid, string port, NetworkPayload? data = null,
+        DeviceLinkSourceComponent? sourceComponent = null)
+    {
+        // NOOP on client for the moment.
+    }
+    #endregion
 }