1 files changed, 25 insertions, 6 deletions

diff --git a/src/SMAPI/Framework/ModHelpers/MultiplayerHelper.cs b/src/SMAPI/Framework/ModHelpers/MultiplayerHelper.cs
index 86f8e012..eedad0bc 100644
--- a/src/SMAPI/Framework/ModHelpers/MultiplayerHelper.cs
+++ b/src/SMAPI/Framework/ModHelpers/MultiplayerHelper.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using StardewModdingAPI.Framework.Networking;
 using StardewValley;
@@ -26,18 +27,18 @@ namespace StardewModdingAPI.Framework.ModHelpers
             this.Multiplayer = multiplayer;
         }
 
-        /// <summary>Get the locations which are being actively synced from the host.</summary>
-        public IEnumerable<GameLocation> GetActiveLocations()
-        {
-            return this.Multiplayer.activeLocations();
-        }
-
         /// <summary>Get a new multiplayer ID.</summary>
         public long GetNewID()
         {
             return this.Multiplayer.getNewID();
         }
 
+        /// <summary>Get the locations which are being actively synced from the host.</summary>
+        public IEnumerable<GameLocation> GetActiveLocations()
+        {
+            return this.Multiplayer.activeLocations();
+        }
+
         /// <summary>Get a connected player.</summary>
         /// <param name="id">The player's unique ID.</param>
         /// <returns>Returns the connected player, or <c>null</c> if no such player is connected.</returns>
@@ -53,5 +54,23 @@ namespace StardewModdingAPI.Framework.ModHelpers
         {
             return this.Multiplayer.Peers.Values;
         }
+
+        /// <summary>Send a message to mods installed by connected players.</summary>
+        /// <typeparam name="TMessage">The data type. This can be a class with a default constructor, or a value type.</typeparam>
+        /// <param name="message">The data to send over the network.</param>
+        /// <param name="messageType">A message type which receiving mods can use to decide whether it's the one they want to handle, like <c>SetPlayerLocation</c>. This doesn't need to be globally unique, since mods should check the originating mod ID.</param>
+        /// <param name="modIDs">The mod IDs which should receive the message on the destination computers, or <c>null</c> for all mods. Specifying mod IDs is recommended to improve performance, unless it's a general-purpose broadcast.</param>
+        /// <param name="playerIDs">The <see cref="Farmer.UniqueMultiplayerID" /> values for the players who should receive the message, or <c>null</c> for all players. If you don't need to broadcast to all players, specifying player IDs is recommended to reduce latency.</param>
+        /// <exception cref="ArgumentNullException">The <paramref name="message"/> or <paramref name="messageType" /> is null.</exception>
+        public void SendMessage<TMessage>(TMessage message, string messageType, string[] modIDs = null, long[] playerIDs = null)
+        {
+            this.Multiplayer.BroadcastModMessage(
+                message: message,
+                messageType: messageType,
+                fromModID: this.ModID,
+                toModIDs: modIDs,
+                toPlayerIDs: playerIDs
+            );
+        }
     }
 }