From 25e5bacc00d0a80506b6e63820e2b2ebc0540ae1 Mon Sep 17 00:00:00 2001
From: ragnarok-clanker <ragnarok-clanker>
Date: Wed, 28 Oct 2026 19:10:27 +0000
Subject: [PATCH] Decompile fn_22268 (SendClientKeepalive)

Batch #1568 by eAthena: 0 byte-identical, 1 confirmed by peer review.

- fn_22268 SendClientKeepalive: logic confirmed by peer review

Reviewed-by: ragnarok-clanker
Adds to the build: Source/Network/ClientKeepalive.cpp
---
 Source/Network/ClientKeepalive.cpp | 32 ++++++++++++++++++++++++++++++
 Source/Network/ClientKeepalive.h   | 11 ++++++++++
 data/compile.json                  |  1 +
 3 files changed, 44 insertions(+)
 create mode 100644 Source/Network/ClientKeepalive.cpp
 create mode 100644 Source/Network/ClientKeepalive.h

diff --git a/Source/Network/ClientKeepalive.cpp b/Source/Network/ClientKeepalive.cpp
new file mode 100644
index 00000000..789fbba5
--- /dev/null
+++ b/Source/Network/ClientKeepalive.cpp
@@ -0,0 +1,32 @@
+#include "Network/ClientKeepalive.h"
+#include "Network/Connection/Connection.h"
+#include "Network/Packets/PacketLengths.h"
+
+#include <timeapi.h>
+
+namespace {
+#pragma pack(push, 1)
+  struct KeepalivePacket {
+    /* 0000 */ std::int16_t id;
+    /* 0002 */ std::uint32_t accountId;
+  };
+#pragma pack(pop)
+  static_assert(sizeof(KeepalivePacket) == 6);
+}
+
+// OFFSET: 0x00D8D960
+// FUNCTION: fn_22268
+void SendClientKeepalive(int subMode, std::uint32_t& nextPingTime, CConnection& connection, const PacketLengths& lengths, const std::uint32_t& accountId) {
+  if (subMode != 7 && subMode != 8 && subMode != 11 && subMode != 19) {
+    return;
+  }
+
+  if (timeGetTime() > nextPingTime) {
+    nextPingTime = timeGetTime() + 12000;
+
+    KeepalivePacket packet;
+    packet.id = 0x0187;
+    packet.accountId = accountId;
+    connection.Send(lengths.FixedLength(packet.id), &packet);
+  }
+}
diff --git a/Source/Network/ClientKeepalive.h b/Source/Network/ClientKeepalive.h
new file mode 100644
index 00000000..c04ef8cb
--- /dev/null
+++ b/Source/Network/ClientKeepalive.h
@@ -0,0 +1,11 @@
+#ifndef RAGNAROK_SOURCE_NETWORK_CLIENTKEEPALIVE_H
+#define RAGNAROK_SOURCE_NETWORK_CLIENTKEEPALIVE_H
+
+#include <cstdint>
+
+class CConnection;
+class PacketLengths;
+
+void SendClientKeepalive(int subMode, std::uint32_t& nextPingTime, CConnection& connection, const PacketLengths& lengths, const std::uint32_t& accountId);
+
+#endif
diff --git a/data/compile.json b/data/compile.json
index a1eed001..63324a03 100644
--- a/data/compile.json
+++ b/data/compile.json
@@ -443,6 +443,7 @@
   "Source/File/MapName.cpp": 1,
   "Source/File/ResourcePath.cpp": 1,
   "Source/File/ShortcutFilename.cpp": 1,
+  "Source/Network/ClientKeepalive.cpp": 0,
   "Source/Network/Connection/Connection.cpp": 0,
   "Source/Network/Connection/ConnectionBuffer.cpp": 0,
   "Source/Network/Connection/ConnectionRuntime.cpp": 0,