diff --git a/radio/src/Makefile b/radio/src/Makefile
index 9d1e9627d..6e1c66853 100644
--- a/radio/src/Makefile
+++ b/radio/src/Makefile
@@ -289,6 +289,10 @@ USB = JOYSTICK
 # NO - normal behaviour, show real channel values
 CHANNELS_MONITOR_INV_HIDE = NO
 
+# Use newlib-nano 
+# Values = NO, YES
+NANO = YES
+
 #------- END BUILD OPTIONS ---------------------------
 
 # Define programs and commands.
@@ -1116,6 +1120,12 @@ MATH_LIB = -lm
 LDFLAGS = -Wl,-Map=$(TARGET).map,--cref
 LDFLAGS += $(MATH_LIB)
 
+ifeq ($(NANO), YES)
+  # use newlib-nano for linking
+  NEWLIB_NANO_FLAGS = --specs=nano.specs -u _printf_float
+  CPPDEFS += -DNANO
+endif
+
 # Define Messages
 # English
 MSG_BEGIN = -------- begin --------
@@ -1324,7 +1334,7 @@ FOXLIB=-L/usr/local/lib \
        -Wl,-rpath,$(FOXPATH)/src/.libs
 
 simu: $(LUADEP) stamp_header $(BOARDSRC) $(CPPSRC) Makefile simu.cpp targets/simu/simpgmspace.cpp *.h tra lbm eeprom.bin
-	g++ $(CPPFLAGS) $(INCFLAGS) simu.cpp $(BOARDSRC) $(CPPSRC) $(LUASRC) targets/simu/simpgmspace.cpp -MD -DSIMU -O0 -o simu $(FOXINC) $(FOXLIB) -pthread -fexceptions
+	g++ $(CPPFLAGS) $(INCFLAGS) simu.cpp $(BOARDSRC) $(CPPSRC) $(LUASRC) targets/simu/simpgmspace.cpp -MD -DSIMU -DLUA_USE_APICHECK -O0 -o simu $(FOXINC) $(FOXLIB) -pthread -fexceptions
 
 eeprom.bin:
 	dd if=/dev/zero of=$@ bs=1 count=2048
@@ -1390,7 +1400,7 @@ OBJS =  $(TMP:.s=.o)
 	@echo
 	@echo $(MSG_COMPILING) $@
 	$(CC) $(ARMCPPFLAGS) $< -o allsrc.o
-	$(CC) $(OBJS) allsrc.o -mcpu=cortex-m3 -mthumb -nostartfiles -lm -T$(LDSCRIPT) -Wl,-Map=$(TARGET).map,--cref,--no-warn-mismatch,--gc-sections -o $@
+	$(CC) $(OBJS) allsrc.o -mcpu=cortex-m3 -mthumb -nostartfiles -lm -T$(LDSCRIPT) -Wl,-Map=$(TARGET).map,--cref,--no-warn-mismatch,--gc-sections $(NEWLIB_NANO_FLAGS) -o $@
 endif
 
 # Target: clean project.
diff --git a/radio/src/lua.cpp b/radio/src/lua.cpp
index cbac308a2..f101760c6 100644
--- a/radio/src/lua.cpp
+++ b/radio/src/lua.cpp
@@ -76,6 +76,19 @@ uint16_t maxLuaDuration = 0;
 #define SCRIPTS_MAX_HEAP                   50
 #define SET_LUA_INSTRUCTIONS_COUNT(x)      (instructionsPercent=0, lua_sethook(L, hook, LUA_MASKCOUNT, x))
 
+struct our_longjmp * global_lj = 0;
+
+/* custom panic handler */
+static int custom_lua_atpanic(lua_State *lua)
+{
+  TRACE("PANIC: unprotected error in call to Lua API (%s)\n", lua_tostring(L, -1));
+  if (global_lj) {
+    longjmp(global_lj->b, 1);
+    /* will never return */
+  }
+  return 0;
+}
+
 static int instructionsPercent = 0;
 void hook(lua_State* L, lua_Debug *ar)
 {
@@ -268,9 +281,10 @@ static int luaPlayFile(lua_State *L)
     strncpy(str, filename, AUDIO_FILENAME_MAXLEN - (str-file));
     file[AUDIO_FILENAME_MAXLEN] = 0;
     PLAY_FILE(file, 0, 0);
-    return 0;
   }
-  PLAY_FILE(filename, 0, 0);
+  else {
+    PLAY_FILE(filename, 0, 0);
+  }
   return 0;
 }
 
@@ -1358,14 +1372,29 @@ static const luaL_Reg lcdLib[] = {
   { NULL, NULL }  /* sentinel */
 };
 
-void luaInit()
+void luaDisable()
+{
+  POPUP_WARNING("Lua disabled!");
+  luaState = INTERPRETER_PANIC;
+}
+
+void luaClose()
 {
   if (L) {
-    lua_close(L);
+    PROTECT_LUA() {
+      lua_close(L);  // this should not panic, but we make sure anyway
+    }
+    else {
+      // we can only disable Lua for the rest of the session
+      luaDisable();
+    }
+    UNPROTECT_LUA();
+    L = NULL;
   }
+}
 
-  L = luaL_newstate();
-
+void luaRegisterAll()
+{
   // Init lua
   luaL_openlibs(L);
 
@@ -1441,13 +1470,50 @@ void luaInit()
   lua_registerint(L, "TIMEHOUR", TIMEHOUR);
 }
 
+void luaInit()
+{
+  luaClose();
+  if (luaState != INTERPRETER_PANIC) {
+    L = luaL_newstate();
+    if (L) {
+      // install our panic handler
+      lua_atpanic(L, &custom_lua_atpanic);
+
+      // protect libs and constants registration
+      PROTECT_LUA() {
+        luaRegisterAll();
+      }
+      else {
+        // if we got panic during registration
+        // we disable Lua for this session
+        luaDisable();
+      }
+      UNPROTECT_LUA();
+    }
+    else {
+      /* log error and return */
+      luaDisable();
+    }
+  }
+}
+
 void luaFree(ScriptInternalData & sid)
 {
-  if (sid.run) {
-    luaL_unref(L, LUA_REGISTRYINDEX, sid.run);
-    sid.run = 0;
+  PROTECT_LUA() {
+    if (sid.run) {
+      luaL_unref(L, LUA_REGISTRYINDEX, sid.run);
+      sid.run = 0;
+    }
+    if (sid.background) {
+      luaL_unref(L, LUA_REGISTRYINDEX, sid.background);
+      sid.background = 0;
+    }
     lua_gc(L, LUA_GCCOLLECT, 0);
   }
+  else {
+    luaDisable();
+  }
+  UNPROTECT_LUA();
 }
 
 int luaLoad(const char *filename, ScriptInternalData & sid, ScriptInputsOutputs * sio=NULL)
@@ -1461,47 +1527,55 @@ int luaLoad(const char *filename, ScriptInternalData & sid, ScriptInputsOutputs
 
   SET_LUA_INSTRUCTIONS_COUNT(MANUAL_SCRIPTS_MAX_INSTRUCTIONS);
 
-  if (luaL_loadfile(L, filename) == 0 &&
-      lua_pcall(L, 0, 1, 0) == 0 &&
-      lua_istable(L, -1)) {
+  PROTECT_LUA() {
+    if (luaL_loadfile(L, filename) == 0 &&
+        lua_pcall(L, 0, 1, 0) == 0 &&
+        lua_istable(L, -1)) {
 
-    luaL_checktype(L, -1, LUA_TTABLE);
+      luaL_checktype(L, -1, LUA_TTABLE);
 
-    for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1)) {
-      const char *key = lua_tostring(L, -2);
-      if (!strcmp(key, "init")) {
-        init = luaL_ref(L, LUA_REGISTRYINDEX);
-        lua_pushnil(L);
+      for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1)) {
+        const char *key = lua_tostring(L, -2);
+        if (!strcmp(key, "init")) {
+          init = luaL_ref(L, LUA_REGISTRYINDEX);
+          lua_pushnil(L);
+        }
+        else if (!strcmp(key, "run")) {
+          sid.run = luaL_ref(L, LUA_REGISTRYINDEX);
+          lua_pushnil(L);
+        }
+        else if (!strcmp(key, "background")) {
+          sid.background = luaL_ref(L, LUA_REGISTRYINDEX);
+          lua_pushnil(L);
+        }
+        else if (sio && !strcmp(key, "input")) {
+          luaGetInputs(*sio);
+        }
+        else if (sio && !strcmp(key, "output")) {
+          luaGetOutputs(*sio);
+        }
       }
-      else if (!strcmp(key, "run")) {
-        sid.run = luaL_ref(L, LUA_REGISTRYINDEX);
-        lua_pushnil(L);
-      }
-      else if (!strcmp(key, "background")) {
-        sid.background = luaL_ref(L, LUA_REGISTRYINDEX);
-        lua_pushnil(L);
-      }
-      else if (sio && !strcmp(key, "input")) {
-        luaGetInputs(*sio);
-      }
-      else if (sio && !strcmp(key, "output")) {
-        luaGetOutputs(*sio);
+
+      if (init) {
+        lua_rawgeti(L, LUA_REGISTRYINDEX, init);
+        if (lua_pcall(L, 0, 0, 0) != 0) {
+          TRACE("Error in script %s init: %s", filename, lua_tostring(L, -1));
+          sid.state = SCRIPT_SYNTAX_ERROR;
+        }
+        luaL_unref(L, LUA_REGISTRYINDEX, init);
+        lua_gc(L, LUA_GCCOLLECT, 0);
       }
     }
-
-    if (init) {
-      lua_rawgeti(L, LUA_REGISTRYINDEX, init);
-      luaL_unref(L, LUA_REGISTRYINDEX, init);
-      if (lua_pcall(L, 0, 0, 0) != 0) {
-        TRACE("Error in script %s init: %s", filename, lua_tostring(L, -1));
-        sid.state = SCRIPT_SYNTAX_ERROR;
-      }
+    else {
+      TRACE("Error in script %s: %s", filename, lua_tostring(L, -1));
+      sid.state = SCRIPT_SYNTAX_ERROR;
     }
   }
   else {
-    TRACE("Error in script %s: %s", filename, lua_tostring(L, -1));
-    sid.state = SCRIPT_SYNTAX_ERROR;
+    TRACE("Panic in script %s: %s", filename, lua_tostring(L, -1));
+    sid.state = SCRIPT_PANIC;
   }
+  UNPROTECT_LUA();
 
   if (sid.state != SCRIPT_OK) {
     luaFree(sid);
@@ -1663,6 +1737,9 @@ void luaError(uint8_t error)
       case SCRIPT_KILLED:
         msg = "Script killed";
         break;
+      case SCRIPT_PANIC:
+        msg = "Script panic";
+        break;
     }
     POPUP_WARNING(msg);
   }
@@ -1670,22 +1747,198 @@ void luaError(uint8_t error)
 
 void luaExec(const char *filename)
 {
-  LUA_RESET();
+  luaInit();
+  
   standaloneScript.state = SCRIPT_NOFILE;
   int result = luaLoad(filename, standaloneScript);
   // TODO the same with run ...
   if (result == SCRIPT_OK) {
-    luaState = LUASTATE_STANDALONE_SCRIPT_RUNNING;
+    luaState = INTERPRETER_RUNNING_STANDALONE_SCRIPT;
   }
   else {
     luaError(result);
+    luaState = INTERPRETER_RELOAD_PERMANENT_SCRIPTS;
   }
 }
 
+void luaDoOneRunStandalone(uint8_t evt)
+{
+  static uint8_t luaDisplayStatistics = false;
+
+  if (standaloneScript.state == SCRIPT_OK && standaloneScript.run) {
+    SET_LUA_INSTRUCTIONS_COUNT(MANUAL_SCRIPTS_MAX_INSTRUCTIONS);
+    lua_rawgeti(L, LUA_REGISTRYINDEX, standaloneScript.run);
+    lua_pushinteger(L, evt);
+    if (lua_pcall(L, 1, 1, 0) == 0) {
+      if (!lua_isnumber(L, -1)) {
+        if (instructionsPercent > 100) {
+          TRACE("Script killed");
+          standaloneScript.state = SCRIPT_KILLED;
+          luaState = INTERPRETER_RELOAD_PERMANENT_SCRIPTS;
+        }
+        else if (lua_isstring(L, -1)) {
+          char nextScript[_MAX_LFN+1];
+          strncpy(nextScript, lua_tostring(L, -1), _MAX_LFN);
+          nextScript[_MAX_LFN] = '\0';
+          luaExec(nextScript);
+        }
+        else {
+          TRACE("Script error");
+          standaloneScript.state = SCRIPT_SYNTAX_ERROR;
+          luaState = INTERPRETER_RELOAD_PERMANENT_SCRIPTS;
+        }
+      }
+      else {
+        int scriptResult = lua_tointeger(L, -1);
+        lua_pop(L, 1);  /* pop returned value */
+        if (scriptResult != 0) {
+          TRACE("Script finished with status %d", scriptResult);
+          standaloneScript.state = SCRIPT_NOFILE;
+          luaState = INTERPRETER_RELOAD_PERMANENT_SCRIPTS;
+        }
+        else if (luaDisplayStatistics) {
+          lcd_hline(0, 7*FH-1, lcdLastPos+FW, ERASE);
+          lcd_puts(0, 7*FH, "GV Use: ");
+          lcd_outdezAtt(lcdLastPos, 7*FH, luaGetMemUsed(), LEFT);
+          lcd_putc(lcdLastPos, 7*FH, 'b');
+          lcd_hline(0, 7*FH-2, lcdLastPos+FW, FORCE);
+          lcd_vlineStip(lcdLastPos+FW, 7*FH-2, FH+2, SOLID, FORCE);
+        }
+      }
+    }
+    else {
+      TRACE("Script error: %s", lua_tostring(L, -1));
+      standaloneScript.state = (instructionsPercent > 100 ? SCRIPT_KILLED : SCRIPT_SYNTAX_ERROR);
+      luaState = INTERPRETER_RELOAD_PERMANENT_SCRIPTS;
+    }
+
+    if (standaloneScript.state != SCRIPT_OK) {
+      luaError(standaloneScript.state);
+      luaState = INTERPRETER_RELOAD_PERMANENT_SCRIPTS;
+    }
+
+    if (evt == EVT_KEY_LONG(KEY_EXIT)) {
+      TRACE("Script force exit");
+      killEvents(evt);
+      standaloneScript.state = SCRIPT_NOFILE;
+      luaState = INTERPRETER_RELOAD_PERMANENT_SCRIPTS;
+    }
+    else if (evt == EVT_KEY_LONG(KEY_MENU)) {
+      killEvents(evt);
+      luaDisplayStatistics = !luaDisplayStatistics;
+    }
+  }
+}
+  
+void luaDoOneRunPermanentScript(uint8_t evt, int i)
+{
+  ScriptInternalData & sid = scriptInternalData[i];
+  if (sid.state == SCRIPT_OK) {
+    SET_LUA_INSTRUCTIONS_COUNT(PERMANENT_SCRIPTS_MAX_INSTRUCTIONS);
+    int inputsCount = 0;
+#if defined(SIMU) || defined(DEBUG)
+    const char *filename;
+#endif
+    ScriptInputsOutputs * sio = NULL;
+    if (sid.reference >= SCRIPT_MIX_FIRST && sid.reference <= SCRIPT_MIX_LAST) {
+      ScriptData & sd = g_model.scriptsData[sid.reference-SCRIPT_MIX_FIRST];
+      sio = &scriptInputsOutputs[sid.reference-SCRIPT_MIX_FIRST];
+      inputsCount = sio->inputsCount;
+#if defined(SIMU) || defined(DEBUG)
+      filename = sd.file;
+#endif
+      lua_rawgeti(L, LUA_REGISTRYINDEX, sid.run);
+      for (int j=0; j<sio->inputsCount; j++) {
+        if (sio->inputs[j].type == 1)
+          luaGetValueAndPush((uint8_t)sd.inputs[j]);
+        else
+          lua_pushinteger(L, sd.inputs[j] + sio->inputs[j].def);
+      }
+    }
+    else if (sid.reference >= SCRIPT_FUNC_FIRST && sid.reference <= SCRIPT_FUNC_LAST) {
+      CustomFnData & fn = g_model.funcSw[sid.reference-SCRIPT_FUNC_FIRST];
+      if (!getSwitch(fn.swtch)) {
+        return;
+      }
+#if defined(SIMU) || defined(DEBUG)
+      filename = fn.play.name;
+#endif
+      lua_rawgeti(L, LUA_REGISTRYINDEX, sid.run);
+    }
+    else {
+#if defined(SIMU) || defined(DEBUG)
+      filename = "[telem]";
+#endif
+      if (g_menuStack[0]==menuTelemetryFrsky && sid.reference==SCRIPT_TELEMETRY_FIRST+s_frsky_view) {
+        lua_rawgeti(L, LUA_REGISTRYINDEX, sid.run);
+        lua_pushinteger(L, evt);
+        inputsCount = 1;
+      }
+      else if (sid.background) {
+        lua_rawgeti(L, LUA_REGISTRYINDEX, sid.background);
+      }
+      else {
+        return;
+      }
+    }
+    if (lua_pcall(L, inputsCount, sio ? sio->outputsCount : 0, 0) == 0) {
+      if (sio) {
+        for (int j=sio->outputsCount-1; j>=0; j--) {
+          if (!lua_isnumber(L, -1)) {
+            sid.state = (instructionsPercent > 100 ? SCRIPT_KILLED : SCRIPT_SYNTAX_ERROR);
+            TRACE("Script %8s disabled", filename);
+            break;
+          }
+          sio->outputs[j].value = lua_tointeger(L, -1);
+          lua_pop(L, 1);
+        }
+      }
+    }
+    else {
+      if (instructionsPercent > 100) {
+        TRACE("Script %8s killed", filename);
+        sid.state = SCRIPT_KILLED;
+      }
+      else {
+        TRACE("Script %8s error: %s", filename, lua_tostring(L, -1));
+        sid.state = SCRIPT_SYNTAX_ERROR;
+      }
+    }
+
+    if (sid.state != SCRIPT_OK) {
+      luaFree(sid);
+    }
+    else {
+      if (instructionsPercent > sid.instructions) {
+        sid.instructions = instructionsPercent;
+      }
+    }
+  }
+}
+
+void luaDoGc()
+{
+  PROTECT_LUA() {
+    lua_gc(L, LUA_GCSTEP /*LUA_GCCOLLECT*/, 0);  // LUA_GCSTEP is enough
+#if defined(SIMU) || defined(DEBUG)
+    static int lastgc = 0;
+    int gc = luaGetMemUsed();
+    if (gc != lastgc) {
+      lastgc = gc;
+      TRACE("GC Use: %dbytes", gc);
+    }
+#endif
+  }
+  else {
+    // we disable Lua for the rest of the session
+    luaDisable();
+  }
+  UNPROTECT_LUA();
+}
+
 void luaTask(uint8_t evt)
 {
   lcd_locked = false;
-  static uint8_t luaDisplayStatistics = false;
 
   uint32_t t0 = get_tmr10ms();
   static uint32_t lastLuaTime = 0;
@@ -1695,176 +1948,40 @@ void luaTask(uint8_t evt)
     maxLuaInterval = interval;
   }
 
-  if (luaState & LUASTATE_STANDALONE_SCRIPT_RUNNING) {
-    // standalone script
-    if (standaloneScript.state == SCRIPT_OK && standaloneScript.run) {
-      SET_LUA_INSTRUCTIONS_COUNT(MANUAL_SCRIPTS_MAX_INSTRUCTIONS);
-      lua_rawgeti(L, LUA_REGISTRYINDEX, standaloneScript.run);
-      lua_pushinteger(L, evt);
-      if (lua_pcall(L, 1, 1, 0) == 0) {
-        if (!lua_isnumber(L, -1)) {
-          if (instructionsPercent > 100) {
-            TRACE("Script killed");
-            standaloneScript.state = SCRIPT_KILLED;
-            luaState = LUASTATE_RELOAD_MODEL_SCRIPTS;
-          }
-          else if (lua_isstring(L, -1)) {
-            char nextScript[_MAX_LFN+1];
-            strncpy(nextScript, lua_tostring(L, -1), _MAX_LFN);
-            nextScript[_MAX_LFN] = '\0';
-            luaExec(nextScript);
-          }
-          else {
-            TRACE("Script error");
-            standaloneScript.state = SCRIPT_SYNTAX_ERROR;
-            luaState = LUASTATE_RELOAD_MODEL_SCRIPTS;
-          }
-        }
-        else {
-          int scriptResult = lua_tointeger(L, -1);
-          lua_pop(L, 1);  /* pop returned value */
-          if (scriptResult != 0) {
-            TRACE("Script finished with status %d", scriptResult);
-            standaloneScript.state = SCRIPT_NOFILE;
-            luaState = LUASTATE_RELOAD_MODEL_SCRIPTS;
-          }
-          else if (luaDisplayStatistics) {
-            int gc = 1000*lua_gc(L, LUA_GCCOUNT, 0) + lua_gc(L, LUA_GCCOUNTB, 0);
-            lcd_hline(0, 7*FH-1, lcdLastPos+FW, ERASE);
-            lcd_puts(0, 7*FH, "GV Use: ");
-            lcd_outdezAtt(lcdLastPos, 7*FH, gc, LEFT);
-            lcd_putc(lcdLastPos, 7*FH, 'b');
-            lcd_hline(0, 7*FH-2, lcdLastPos+FW, FORCE);
-            lcd_vlineStip(lcdLastPos+FW, 7*FH-2, FH+2, SOLID, FORCE);
-          }
-        }
-      }
-      else {
-        TRACE("Script error: %s", lua_tostring(L, -1));
-        standaloneScript.state = (instructionsPercent > 100 ? SCRIPT_KILLED : SCRIPT_SYNTAX_ERROR);
-        luaState = LUASTATE_RELOAD_MODEL_SCRIPTS;
-      }
-
-      if (standaloneScript.state != SCRIPT_OK) {
-        luaError(standaloneScript.state);
-      }
-
-      if (evt == EVT_KEY_LONG(KEY_EXIT)) {
-        TRACE("Script force exit");
-        killEvents(evt);
-        standaloneScript.state = SCRIPT_NOFILE;
-        luaState = LUASTATE_RELOAD_MODEL_SCRIPTS;
-      }
-      else if (evt == EVT_KEY_LONG(KEY_MENU)) {
-        killEvents(evt);
-        luaDisplayStatistics = !luaDisplayStatistics;
-      }
+  if (luaState & INTERPRETER_RUNNING_STANDALONE_SCRIPT) {
+    PROTECT_LUA() {
+      luaDoOneRunStandalone(evt);
     }
+    else {
+      POPUP_WARNING("Script Panic!");
+      luaState = INTERPRETER_RELOAD_PERMANENT_SCRIPTS;
+    }
+    UNPROTECT_LUA();
   }
   else {
     // model scripts
-    if (luaState & LUASTATE_RELOAD_MODEL_SCRIPTS) {
+    if (luaState & INTERPRETER_RELOAD_PERMANENT_SCRIPTS) {
       luaState = 0;
-      LUA_RESET();
+      luaInit();
+      if (!L) return;
       luaLoadPermanentScripts();
     }
 
     for (int i=0; i<luaScriptsCount; i++) {
-      ScriptInternalData & sid = scriptInternalData[i];
-      if (sid.state == SCRIPT_OK) {
-        SET_LUA_INSTRUCTIONS_COUNT(PERMANENT_SCRIPTS_MAX_INSTRUCTIONS);
-        int inputsCount = 0;
-#if defined(SIMU) || defined(DEBUG)
-        const char *filename;
-#endif
-        ScriptInputsOutputs * sio = NULL;
-        if (sid.reference >= SCRIPT_MIX_FIRST && sid.reference <= SCRIPT_MIX_LAST) {
-          ScriptData & sd = g_model.scriptsData[sid.reference-SCRIPT_MIX_FIRST];
-          sio = &scriptInputsOutputs[sid.reference-SCRIPT_MIX_FIRST];
-          inputsCount = sio->inputsCount;
-#if defined(SIMU) || defined(DEBUG)
-          filename = sd.file;
-#endif
-          lua_rawgeti(L, LUA_REGISTRYINDEX, sid.run);
-          for (int j=0; j<sio->inputsCount; j++) {
-            if (sio->inputs[j].type == 1)
-              luaGetValueAndPush((uint8_t)sd.inputs[j]);
-            else
-              lua_pushinteger(L, sd.inputs[j] + sio->inputs[j].def);
-          }
-        }
-        else if (sid.reference >= SCRIPT_FUNC_FIRST && sid.reference <= SCRIPT_FUNC_LAST) {
-          CustomFnData & fn = g_model.funcSw[sid.reference-SCRIPT_FUNC_FIRST];
-          if (!getSwitch(fn.swtch)) {
-            continue;
-          }
-#if defined(SIMU) || defined(DEBUG)
-          filename = fn.play.name;
-#endif
-          lua_rawgeti(L, LUA_REGISTRYINDEX, sid.run);
-        }
-        else {
-#if defined(SIMU) || defined(DEBUG)
-          filename = "[telem]";
-#endif
-          if (g_menuStack[0]==menuTelemetryFrsky && sid.reference==SCRIPT_TELEMETRY_FIRST+s_frsky_view) {
-            lua_rawgeti(L, LUA_REGISTRYINDEX, sid.run);
-            lua_pushinteger(L, evt);
-            inputsCount = 1;
-          }
-          else if (sid.background) {
-            lua_rawgeti(L, LUA_REGISTRYINDEX, sid.background);
-          }
-          else {
-            continue;
-          }
-        }
-        if (lua_pcall(L, inputsCount, sio ? sio->outputsCount : 0, 0) == 0) {
-          if (sio) {
-            for (int j=sio->outputsCount-1; j>=0; j--) {
-              if (!lua_isnumber(L, -1)) {
-                sid.state = (instructionsPercent > 100 ? SCRIPT_KILLED : SCRIPT_SYNTAX_ERROR);
-                TRACE("Script %8s disabled", filename);
-                break;
-              }
-              sio->outputs[j].value = lua_tointeger(L, -1);
-              lua_pop(L, 1);
-            }
-          }
-        }
-        else {
-          if (instructionsPercent > 100) {
-            TRACE("Script %8s killed", filename);
-            sid.state = SCRIPT_KILLED;
-          }
-          else {
-            TRACE("Script %8s error: %s", filename, lua_tostring(L, -1));
-            sid.state = SCRIPT_SYNTAX_ERROR;
-          }
-        }
-
-        if (sid.state != SCRIPT_OK) {
-          luaFree(sid);
-        }
-        else {
-          if (instructionsPercent > sid.instructions) {
-            sid.instructions = instructionsPercent;
-          }
-        }
+      PROTECT_LUA() {
+        luaDoOneRunPermanentScript(evt, i);
       }
+      else {
+        // we disable this script for the rest of the session
+        ScriptInternalData & sid = scriptInternalData[i];
+        sid.state = SCRIPT_PANIC;
+        luaFree(sid);
+      }
+      UNPROTECT_LUA();
     }
   }
 
-  lua_gc(L, LUA_GCCOLLECT, 0);
-
-#if defined(SIMU) || defined(DEBUG)
-  static int lastgc = 0;
-  int gc = luaGetMemUsed();
-  if (gc != lastgc) {
-    lastgc = gc;
-    TRACE("GC Use: %dbytes", gc);
-  }
-#endif
+  luaDoGc();
 
   t0 = get_tmr10ms() - t0;
   if (t0 > maxLuaDuration) {
@@ -1874,5 +1991,5 @@ void luaTask(uint8_t evt)
 
 int luaGetMemUsed()
 {
-  return 1000*lua_gc(L, LUA_GCCOUNT, 0) + lua_gc(L, LUA_GCCOUNTB, 0);
+  return (lua_gc(L, LUA_GCCOUNT, 0) << 10) + lua_gc(L, LUA_GCCOUNTB, 0);
 }
diff --git a/radio/src/opentx.cpp b/radio/src/opentx.cpp
index 22525814f..e3db50581 100644
--- a/radio/src/opentx.cpp
+++ b/radio/src/opentx.cpp
@@ -2505,6 +2505,10 @@ void opentxClose()
   // TODO needed? telemetryEnd();
 #endif
 
+#if defined(LUA)
+  luaClose();
+#endif
+
 #if defined(SDCARD)
   closeLogs();
   sdDone();
@@ -3352,8 +3356,6 @@ void opentxInit(OPENTX_INIT_ARGS)
   rtcInit();
 #endif
 
-  LUA_INIT();
-
   if (g_eeGeneral.backlightMode != e_backlight_mode_off) backlightOn(); // on Tx start turn the light on
 
   if (UNEXPECTED_SHUTDOWN()) {
diff --git a/radio/src/opentx.h b/radio/src/opentx.h
index 0ebf25d19..7f98f5a8b 100644
--- a/radio/src/opentx.h
+++ b/radio/src/opentx.h
@@ -1475,7 +1475,8 @@ enum AUDIO_SOUNDS {
     SCRIPT_OK,
     SCRIPT_NOFILE,
     SCRIPT_SYNTAX_ERROR,
-    SCRIPT_KILLED
+    SCRIPT_PANIC,
+    SCRIPT_KILLED,
   };
   enum ScriptReference {
     SCRIPT_MIX_FIRST,
@@ -1498,13 +1499,18 @@ enum AUDIO_SOUNDS {
     uint8_t outputsCount;
     ScriptOutput outputs[MAX_SCRIPT_OUTPUTS];
   };
-  #define LUASTATE_STANDALONE_SCRIPT_RUNNING 1
-  #define LUASTATE_RELOAD_MODEL_SCRIPTS      2
+  enum InterpreterState {
+    INTERPRETER_RUNNING_PERMANENT_SCRIPTS,
+    INTERPRETER_RUNNING_STANDALONE_SCRIPT,
+    INTERPRETER_RELOAD_PERMANENT_SCRIPTS,
+    INTERPRETER_PANIC,
+  };
   extern uint8_t luaState;
   extern uint8_t luaScriptsCount;
   extern ScriptInternalData standaloneScript;
   extern ScriptInternalData scriptInternalData[MAX_SCRIPTS];
   extern ScriptInputsOutputs scriptInputsOutputs[MAX_SCRIPTS];
+  void luaClose();
   void luaInit();
   void luaTask(uint8_t evt);
   void luaExec(const char *filename);
@@ -1513,13 +1519,23 @@ enum AUDIO_SOUNDS {
   int luaGetMemUsed();
   #define luaGetCpuUsed(idx) scriptInternalData[idx].instructions
   bool isTelemetryScriptAvailable(uint8_t index);
-  #define LUA_INIT()
-  #define LUA_RESET() luaInit()
-  #define LUA_LOAD_MODEL_SCRIPTS()   luaState |= LUASTATE_RELOAD_MODEL_SCRIPTS
-  #define LUA_LOAD_MODEL_SCRIPT(idx) luaState |= LUASTATE_RELOAD_MODEL_SCRIPTS
+  #define LUA_LOAD_MODEL_SCRIPTS()   luaState |= INTERPRETER_RELOAD_PERMANENT_SCRIPTS
+  #define LUA_LOAD_MODEL_SCRIPT(idx) luaState |= INTERPRETER_RELOAD_PERMANENT_SCRIPTS
+
+  // Lua PROTECT/UNPROTECT
+  #include <setjmp.h>
+  struct our_longjmp {
+    struct our_longjmp *previous;
+    jmp_buf b;
+    volatile int status;  /* error code */
+  };
+  extern struct our_longjmp * global_lj;
+  #define PROTECT_LUA()   { struct our_longjmp lj; \
+                          lj.previous = global_lj;  /* chain new error handler */ \
+                          global_lj = &lj;  \
+                          if (setjmp(lj.b) == 0)
+  #define UNPROTECT_LUA() global_lj = lj.previous; }   /* restore old error handler */
 #else
-  #define LUA_INIT()
-  #define LUA_RESET()
   #define LUA_LOAD_MODEL_SCRIPTS()
   #define LUA_LOAD_MODEL_SCRIPT(idx)
 #endif
diff --git a/radio/src/targets/simu/simpgmspace.cpp b/radio/src/targets/simu/simpgmspace.cpp
index d69992eb4..51575164b 100644
--- a/radio/src/targets/simu/simpgmspace.cpp
+++ b/radio/src/targets/simu/simpgmspace.cpp
@@ -309,8 +309,6 @@ void *main_thread(void *)
 
     if (g_eeGeneral.backlightMode != e_backlight_mode_off) backlightOn(); // on Tx start turn the light on
 
-    LUA_INIT();
-
     if (main_thread_running == 1) {
       opentxStart();
     }
diff --git a/radio/src/tasks_arm.cpp b/radio/src/tasks_arm.cpp
index 219776b49..3c9be1f81 100755
--- a/radio/src/tasks_arm.cpp
+++ b/radio/src/tasks_arm.cpp
@@ -99,6 +99,13 @@ uint32_t stack_free(uint32_t tid)
       stack = audioStack;
       size = AUDIO_STACK_SIZE;
       break;
+#if defined(PCBTARANIS)
+    case 255:
+      // main stack
+      stack = (OS_STK *)&_main_stack_start;
+      size = ((unsigned char *)&_estack - (unsigned char *)&_main_stack_start) / 4;
+      break;
+#endif
     default:
       return 0;
   }
@@ -107,7 +114,7 @@ uint32_t stack_free(uint32_t tid)
   for (; i<size; i++)
     if (stack[i] != 0x55555555)
       break;
-  return i;
+  return i*4;
 }
 
 void mixerTask(void * pdata)
diff --git a/radio/src/tests/gtests.cpp b/radio/src/tests/gtests.cpp
index cac6a7f58..c36ea5e6b 100644
--- a/radio/src/tests/gtests.cpp
+++ b/radio/src/tests/gtests.cpp
@@ -183,7 +183,6 @@ int main(int argc, char **argv)
   StartEepromThread(NULL);
   g_menuStackPtr = 0;
   g_menuStack[0] = menuMainView;
-  LUA_RESET();
   ::testing::InitGoogleTest(&argc, argv);
   return RUN_ALL_TESTS();
 }
diff --git a/radio/src/tests/lua.cpp b/radio/src/tests/lua.cpp
index 78f40c780..e7a4558a1 100755
--- a/radio/src/tests/lua.cpp
+++ b/radio/src/tests/lua.cpp
@@ -52,6 +52,8 @@ extern const char * zchar2string(const char * zstring, int size);
 void luaExecStr(const char * str)
 {
   extern lua_State * L;
+  if (!L) luaInit();
+  if (!L) FAIL() << "No Lua state!";
   if (luaL_dostring(L, str)) {
     FAIL() << "lua error: " << lua_tostring(L, -1);
   }
@@ -98,4 +100,51 @@ TEST(Lua, testSetTelemetryChannel)
 
 }
 
+TEST(Lua, testPanicProtection)
+{
+  bool passed = false;
+  PROTECT_LUA() {
+    PROTECT_LUA() {
+      //simulate panic
+      longjmp(global_lj->b, 1);
+    }
+    else {
+      //we should come here
+      passed = true;
+    }
+    UNPROTECT_LUA();
+  }
+  else {
+    // an not here
+    // TRACE("testLuaProtection: test 1 FAILED");
+    FAIL() << "Failed test 1";
+  }
+  UNPROTECT_LUA()
+
+  EXPECT_EQ(passed, true);
+
+  passed = false;
+
+  PROTECT_LUA() {
+    PROTECT_LUA() {
+      int a = 5;
+      a = a; // avoids the warning
+    }
+    else {
+      //we should not come here
+      // TRACE("testLuaProtection: test 2 FAILED");
+      FAIL() << "Failed test 2";
+    }
+    UNPROTECT_LUA()
+    //simulate panic
+    longjmp(global_lj->b, 1);
+  }
+  else {
+    // we should come here
+    passed = true;
+  }
+  UNPROTECT_LUA()
+
+  EXPECT_EQ(passed, true);
+}
 #endif