From dfee0c8ba22700d9223f5dc37e484b9b24099934 Mon Sep 17 00:00:00 2001
From: yellows8 <yellows8@users.noreply.github.com>
Date: Wed, 18 Jun 2025 18:17:05 -0400
Subject: [PATCH] ldn: Added ldnSetProtocol.

---
 nx/include/switch/services/ldn.h | 13 +++++++++++++
 nx/source/services/ldn.c         |  7 +++++++
 2 files changed, 20 insertions(+)

diff --git a/nx/include/switch/services/ldn.h b/nx/include/switch/services/ldn.h
index 1da556c7..7bef8811 100644
--- a/nx/include/switch/services/ldn.h
+++ b/nx/include/switch/services/ldn.h
@@ -67,6 +67,12 @@ typedef enum {
     LdnWirelessControllerRestriction_Unknown1 = 1,   ///< Unknown
 } LdnWirelessControllerRestriction;
 
+/// Protocol
+typedef enum {
+    LdnProtocol_NX       = 1,   ///< NX (default)
+    LdnProtocol_Unknown3 = 3,   ///< (NXAndOunce?)
+} LdnProtocol;
+
 /// Ipv4Address. This is essentially the same as struct in_addr - hence this can be used with standard sockets (byteswap required).
 typedef struct {
     u32 addr;                          ///< Address
@@ -331,6 +337,13 @@ Result ldnScanPrivate(s32 channel, const LdnScanFilter *filter, LdnNetworkInfo *
  */
 Result ldnSetWirelessControllerRestriction(LdnWirelessControllerRestriction restriction);
 
+/**
+ * @brief SetProtocol
+ * @note This is only usable with [20.0.0+] (with [18.0.0-19-0.1] this is available but not usable).
+ * @param[in] protocol \ref LdnProtocol
+ */
+Result ldnSetProtocol(LdnProtocol protocol);
+
 /**
  * @brief OpenAccessPoint
  * @note \ref LdnState must be ::LdnState_Initialized, this eventually sets the State to ::LdnState_AccessPointOpened.
diff --git a/nx/source/services/ldn.c b/nx/source/services/ldn.c
index 0dd55265..705ddcfe 100644
--- a/nx/source/services/ldn.c
+++ b/nx/source/services/ldn.c
@@ -289,6 +289,13 @@ Result ldnSetWirelessControllerRestriction(LdnWirelessControllerRestriction rest
     return _ldnCmdInU32NoOut(&g_ldnSrv, restriction, 104);
 }
 
+Result ldnSetProtocol(LdnProtocol protocol) {
+    if (hosversionBefore(18,0,0))
+        return MAKERESULT(Module_Libnx, LibnxError_IncompatSysVer);
+
+    return _ldnCmdInU32NoOut(&g_ldnSrv, protocol, 106);
+}
+
 Result ldnOpenAccessPoint(void) {
     return _ldnCmdNoIO(&g_ldnSrv, 200);
 }