diff --git a/docs/changes.txt b/docs/changes.txt
index 6007b16..25ad43a 100644
--- a/docs/changes.txt
+++ b/docs/changes.txt
@@ -43,7 +43,8 @@ v0.3
 
 v0.4
 
-* nfqws2: profile names
+* nfqws2: profile names and cookies
 * nfqws2: profile templates
 * nfqws2: remove stun_binding_req, replace to stun. no more message type details
 * blockcheck2: fix broken dns cache
+* nfqws2: LUA_COMPAT_VER tracking
diff --git a/docs/changes_compat.txt b/docs/changes_compat.txt
new file mode 100755
index 0000000..1692b54
--- /dev/null
+++ b/docs/changes_compat.txt
@@ -0,0 +1,7 @@
+Here listed all api breaking changes.
+When something changes capable of breaking things NFQWS2_COMPAT_VER increases.
+
+v2
+* removed "stun_binding_req" specialized payload. replaced with common "stun" - any stun packets, not only binding request.
+every LUA relying on desync.l7payload should be revised.
+nfqws2 --payload option and init.d custom scripts must be updated.
diff --git a/nfq2/lua.c b/nfq2/lua.c
index cea9313..1b36589 100644
--- a/nfq2/lua.c
+++ b/nfq2/lua.c
@@ -2792,6 +2792,21 @@ static void lua_init_const(void)
 {
 	LUA_STACK_GUARD_ENTER(params.L)
 
+	const struct
+	{
+		const char *name, *v;
+	} cstr[] = {
+		{"NFQWS2_VER",params.verstr}
+	};
+
+	DLOG("LUA STR:");
+	for (int i=0;i<sizeof(cstr)/sizeof(*cstr);i++)
+	{
+		lua_pushstring(params.L, cstr[i].v);
+		lua_setglobal(params.L, cstr[i].name);
+		DLOG(" %s", cstr[i].name);
+	}
+
 	const struct
 	{
 		const char *name;
@@ -2803,6 +2818,7 @@ static void lua_init_const(void)
 		{"divert_port",params.port},
 #endif
 		{"desync_fwmark",params.desync_fwmark},
+		{"NFQWS2_COMPAT_VER",LUA_COMPAT_VER},
 
 		{"VERDICT_PASS",VERDICT_PASS},
 		{"VERDICT_MODIFY",VERDICT_MODIFY},
@@ -2864,7 +2880,7 @@ static void lua_init_const(void)
 		{"IPPROTO_SHIM6",IPPROTO_SHIM6},
 		{"IPPROTO_NONE",IPPROTO_NONE}
 	};
-	DLOG("LUA NUMERIC:");
+	DLOG("\nLUA NUMERIC:");
 	for (int i=0;i<sizeof(cuint)/sizeof(*cuint);i++)
 	{
 		lua_pushinteger(params.L, (lua_Integer)cuint[i].v);
diff --git a/nfq2/nfqws.c b/nfq2/nfqws.c
index e329418..4605674 100644
--- a/nfq2/nfqws.c
+++ b/nfq2/nfqws.c
@@ -1499,22 +1499,6 @@ static void ApplyDefaultBlobs(struct blob_collection_head *blobs)
 	load_const_blob_to_collection("fake_default_quic",buf,620,blobs,0);
 }
 
-#define STRINGIFY(x) #x
-#define TOSTRING(x) STRINGIFY(x)
-#if defined(ZAPRET_GH_VER) || defined (ZAPRET_GH_HASH)
-#ifdef __ANDROID__
-#define PRINT_VER printf("github android version %s (%s)\n\n", TOSTRING(ZAPRET_GH_VER), TOSTRING(ZAPRET_GH_HASH))
-#else
-#define PRINT_VER printf("github version %s (%s)\n\n", TOSTRING(ZAPRET_GH_VER), TOSTRING(ZAPRET_GH_HASH))
-#endif
-#else
-#ifdef __ANDROID__
-#define PRINT_VER printf("self-built android version %s %s\n\n", __DATE__, __TIME__)
-#else
-#define PRINT_VER printf("self-built version %s %s\n\n", __DATE__, __TIME__)
-#endif
-#endif
-
 enum opt_indices {
 	IDX_DEBUG,
 	IDX_DRY_RUN,
@@ -1686,6 +1670,23 @@ static const struct option long_options[] = {
 	[IDX_LAST] = {NULL, 0, NULL, 0},
 };
 
+
+#define STRINGIFY(x) #x
+#define TOSTRING(x) STRINGIFY(x)
+#if defined(ZAPRET_GH_VER) || defined (ZAPRET_GH_HASH)
+#ifdef __ANDROID__
+#define MAKE_VER(s,size) snprintf(s,size,"github android version %s (%s) lua_compat_ver %u", TOSTRING(ZAPRET_GH_VER), TOSTRING(ZAPRET_GH_HASH), LUA_COMPAT_VER)
+#else
+#define MAKE_VER(s,size) snprintf(s,size,"github version %s (%s) lua_compat_ver %u", TOSTRING(ZAPRET_GH_VER), TOSTRING(ZAPRET_GH_HASH), LUA_COMPAT_VER)
+#endif
+#else
+#ifdef __ANDROID__
+#define MAKE_VER(s,size) snprintf(s,size,"self-built android version %s %s lua_compat_ver %u", __DATE__, __TIME__, LUA_COMPAT_VER)
+#else
+#define MAKE_VER(s,size) snprintf(s,size,"self-built version %s %s lua_compat_ver %u", __DATE__, __TIME__, LUA_COMPAT_VER)
+#endif
+#endif
+
 int main(int argc, char **argv)
 {
 #ifdef __CYGWIN__
@@ -1720,9 +1721,11 @@ int main(int argc, char **argv)
 	prepare_low_appdata();
 #endif
 
-	PRINT_VER;
-
 	init_params(&params);
+
+	MAKE_VER(params.verstr, sizeof(params.verstr));
+	printf("%s\n\n",params.verstr);
+
 	ApplyDefaultBlobs(&params.blobs);
 
 	struct desync_profile_list *dpl;
diff --git a/nfq2/nfqws.h b/nfq2/nfqws.h
index 745f695..ce69646 100644
--- a/nfq2/nfqws.h
+++ b/nfq2/nfqws.h
@@ -10,3 +10,6 @@
 extern bool bQuit;
 #endif
 int main(int argc, char *argv[]);
+
+// when something changes that can break LUA compatibility this version should be increased
+#define LUA_COMPAT_VER	2
diff --git a/nfq2/params.h b/nfq2/params.h
index 25664ad..6bec0be 100644
--- a/nfq2/params.h
+++ b/nfq2/params.h
@@ -113,6 +113,7 @@ struct params_s
 #if !defined( __OpenBSD__) && !defined(__ANDROID__)
 	wordexp_t wexp; // for file based config
 #endif
+	char verstr[128];
 
 	enum log_target debug_target;
 	char debug_logfile[PATH_MAX];