Ability to send fax to all shuttles

Content.Server/Corvax/FaxMultiaddress/FaxMultiaddressComponent.cs

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+namespace Content.Server.Corvax.FaxMultiaddress;
+
+[RegisterComponent]
+public sealed partial class FaxMultiaddressComponent : Component;

Content.Server/Corvax/FaxMultiaddress/FaxMultiaddressSystem.cs

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+using Content.Server.DeviceNetwork;
+using Content.Server.DeviceNetwork.Components;
+using Content.Server.DeviceNetwork.Systems;
+using Content.Server.Fax;
+using Content.Shared.Fax.Components;
+using Content.Shared.GameTicking;
+using Content.Shared.Paper;
+using Content.Shared.Shipyard.Components;
+
+namespace Content.Server.Corvax.FaxMultiaddress;
+
+public sealed class FaxMultiaddressSystem : EntitySystem
+{
+    [Dependency] private readonly DeviceNetworkSystem _network = default!;
+    [Dependency] private readonly FaxSystem _fax = default!;
+
+    public override void Initialize()
+    {
+        SubscribeLocalEvent<RoundStartedEvent>(OnRoundStarted);
+        SubscribeLocalEvent<FaxMultiaddressComponent, DeviceNetworkPacketEvent>(OnDeviceNetworkPacket);
+    }
+
+    private void OnRoundStarted(RoundStartedEvent e)
+    {
+        Spawn("FaxMultiaddress");
+    }
+
+    private void OnDeviceNetworkPacket(EntityUid entity, FaxMultiaddressComponent component, DeviceNetworkPacketEvent e)
+    {
+        if (!TryComp<DeviceNetworkComponent>(entity, out var device))
+            return;
+
+        if (!e.Data.TryGetValue(DeviceNetworkConstants.Command, out string? command))
+            return;
+
+        switch (command)
+        {
+            case FaxConstants.FaxPingCommand:
+                _network.QueuePacket(entity, e.SenderAddress, new()
+                {
+                    [DeviceNetworkConstants.Command] = FaxConstants.FaxPongCommand,
+                    [FaxConstants.FaxNameData] = "All Shuttles"
+                });
+
+                break;
+            case FaxConstants.FaxPrintCommand:
+                if (!e.Data.TryGetValue(FaxConstants.FaxPaperNameData, out string? name))
+                    return;
+
+                if (!e.Data.TryGetValue(FaxConstants.FaxPaperContentData, out string? content))
+                    return;
+
+                e.Data.TryGetValue(FaxConstants.FaxPaperLabelData, out string? label);
+                e.Data.TryGetValue(FaxConstants.FaxPaperStampStateData, out string? stampState);
+                e.Data.TryGetValue(FaxConstants.FaxPaperStampedByData, out List<StampDisplayInfo>? stampedBy);
+                e.Data.TryGetValue(FaxConstants.FaxPaperPrototypeData, out string? prototype);
+
+                FaxPrintout printout = new(content, name, label, prototype, stampState, stampedBy);
+
+                var faxes = AllEntityQuery<FaxMachineComponent>();
+
+                while (faxes.MoveNext(out var fax, out var faxComponent))
+                    if (fax != e.Sender && HasComp<ShuttleDeedComponent>(Transform(fax).GridUid))
+                        _fax.Receive(fax, printout, device.Address, faxComponent);
+
+                break;
+        }
+    }
+}

Resources/Prototypes/CorvaxFrontier/Entities/fax_multiaddress.yml

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+- type: entity
+  id: FaxMultiaddress
+  components:
+  - type: FaxMultiaddress
+  - type: DeviceNetwork
+    deviceNetId: Wireless
+    receiveFrequencyId: Fax
+    transmitFrequencyId: Fax