diff --git a/components/lua/lua-5.1/lnodemcu.h b/components/lua/lua-5.1/lnodemcu.h
index e9e2ee1a..36de5602 100644
--- a/components/lua/lua-5.1/lnodemcu.h
+++ b/components/lua/lua-5.1/lnodemcu.h
@@ -45,9 +45,11 @@
   static ROTable_entry LOCK_IN_SECTION(s) rt ## _entries[] = {
 #define LROT_END(rt,mt,f)    {NULL, LRO_NILVAL} }; \
   const ROTable rt ## _ROTable = { \
-    (GCObject *)1, LUA_TROTABLE, LROT_MARKED, \
-    cast(lu_byte, ~(f)), (sizeof(rt ## _entries)/sizeof(ROTable_entry)) - 1, \
-    cast(Table *, mt), cast(ROTable_entry *, rt ## _entries) };
+    .next = (GCObject *)1, .tt = LUA_TROTABLE, .marked = LROT_MARKED, \
+    .flags = cast(lu_byte, ~(f)), \
+    .lsizenode = (sizeof(rt ## _entries)/sizeof(ROTable_entry)) - 1, \
+    .metatable = cast(Table *, mt), \
+    .entry = cast(ROTable_entry *, rt ## _entries) };
 #define LROT_BREAK(rt)       };
 
 #define LROT_MASK(m)         cast(lu_byte, 1<<TM_ ## m)
diff --git a/components/modules/crypto.c b/components/modules/crypto.c
index 524d6b56..2f0d3c92 100644
--- a/components/modules/crypto.c
+++ b/components/modules/crypto.c
@@ -153,12 +153,12 @@ static int crypto_hash_gc(lua_State* L) {
 }
 
 // The following table defines methods of the hasher object
-LROT_BEGIN(crypto_hasher, NULL, 0)
+LROT_BEGIN(crypto_hasher, NULL, LROT_MASK_GC_INDEX)
     LROT_FUNCENTRY(__gc,     crypto_hash_gc)
     LROT_TABENTRY(__index,   crypto_hasher)
     LROT_FUNCENTRY(update,   crypto_hash_update)
     LROT_FUNCENTRY(finalize, crypto_hash_finalize)
-LROT_END(crypto_hasher, NULL, 0)
+LROT_END(crypto_hasher, NULL, LROT_MASK_GC_INDEX)
 
 // This table defines the functions of the crypto module:
 LROT_BEGIN(crypto, NULL, 0)
diff --git a/components/modules/file.c b/components/modules/file.c
index 658bada9..2c579cf2 100644
--- a/components/modules/file.c
+++ b/components/modules/file.c
@@ -549,7 +549,7 @@ static int file_chdir( lua_State *L )
 }
 #endif
 
-LROT_BEGIN(file_obj, NULL, 0)
+LROT_BEGIN(file_obj, NULL, LROT_MASK_GC_INDEX)
   LROT_FUNCENTRY( __gc,      file_obj_free )
   LROT_TABENTRY ( __index,   file_obj )
   LROT_FUNCENTRY( close,     file_close )
@@ -559,7 +559,7 @@ LROT_BEGIN(file_obj, NULL, 0)
   LROT_FUNCENTRY( writeline, file_writeline )
   LROT_FUNCENTRY( seek,      file_seek )
   LROT_FUNCENTRY( flush,     file_flush )
-LROT_END(file_obj, NULL, 0)
+LROT_END(file_obj, NULL, LROT_MASK_GC_INDEX)
 
 // Module function map
 LROT_BEGIN(file, NULL, 0)
diff --git a/components/modules/http.c b/components/modules/http.c
index e6f80753..4bdf7132 100644
--- a/components/modules/http.c
+++ b/components/modules/http.c
@@ -790,7 +790,7 @@ LROT_BEGIN(http, NULL, 0)
   LROT_FUNCENTRY(post,             http_lapi_post)
 LROT_END(http, NULL, 0)
 
-LROT_BEGIN(http_context, NULL, 0)
+LROT_BEGIN(http_context, NULL, LROT_MASK_GC_INDEX)
   LROT_FUNCENTRY(__gc,        context_gc)
   LROT_TABENTRY (__index,     http_context)
   LROT_FUNCENTRY(on,          http_lapi_on)
@@ -801,7 +801,7 @@ LROT_BEGIN(http_context, NULL, 0)
   LROT_FUNCENTRY(setpostdata, http_lapi_setpostdata)
   LROT_FUNCENTRY(close,       context_close)
   LROT_FUNCENTRY(ack,         http_lapi_ack)
-LROT_END(http_context, NULL, 0)
+LROT_END(http_context, NULL, LROT_MASK_GC_INDEX)
 
 static int luaopen_http(lua_State *L)
 {
diff --git a/components/modules/ledc.c b/components/modules/ledc.c
index 515580be..add40b6d 100644
--- a/components/modules/ledc.c
+++ b/components/modules/ledc.c
@@ -231,7 +231,7 @@ static int lledc_set_fade( lua_State *L ) {
 }
 
 // Module function map
-LROT_BEGIN(ledc_channel, NULL, 0)
+LROT_BEGIN(ledc_channel, NULL, LROT_MASK_INDEX)
   LROT_TABENTRY ( __index,         ledc_channel )
   LROT_FUNCENTRY( getduty,         lledc_get_duty )
   LROT_FUNCENTRY( setduty,         lledc_set_duty )
@@ -246,7 +246,7 @@ LROT_BEGIN(ledc_channel, NULL, 0)
   LROT_FUNCENTRY( fadewithtime,    lledc_set_fade_with_time )
   LROT_FUNCENTRY( fadewithstep,    lledc_set_fade_with_step )
   LROT_FUNCENTRY( fade,            lledc_set_fade )
-LROT_END(ledc_channel, NULL, 0)
+LROT_END(ledc_channel, NULL, LROT_MASK_INDEX)
 
 LROT_BEGIN(ledc, NULL, 0)
   LROT_FUNCENTRY( newChannel,      lledc_new_channel )
diff --git a/components/modules/mqtt.c b/components/modules/mqtt.c
index 9b92f22f..ecc8aca4 100644
--- a/components/modules/mqtt.c
+++ b/components/modules/mqtt.c
@@ -635,7 +635,7 @@ static int mqtt_new(lua_State* L) {
 }
 
 // map client methods to functions:
-LROT_BEGIN(mqtt_metatable, NULL, 0)
+LROT_BEGIN(mqtt_metatable, NULL, LROT_MASK_GC_INDEX)
   LROT_FUNCENTRY(__gc, mqtt_delete)
   LROT_TABENTRY(__index, mqtt_metatable)
   LROT_FUNCENTRY(connect, mqtt_connect)
@@ -645,7 +645,7 @@ LROT_BEGIN(mqtt_metatable, NULL, 0)
   LROT_FUNCENTRY(subscribe, mqtt_subscribe)
   LROT_FUNCENTRY(unsubscribe, mqtt_unsubscribe)
   LROT_FUNCENTRY(on, mqtt_on)
-LROT_END(mqtt_metatable, NULL, 0)
+LROT_END(mqtt_metatable, NULL, LROT_MASK_GC_INDEX)
 
 // Module function map
 LROT_BEGIN(mqtt, NULL, 0)
diff --git a/components/modules/net.c b/components/modules/net.c
index bb7074e7..8c5978a3 100644
--- a/components/modules/net.c
+++ b/components/modules/net.c
@@ -1108,15 +1108,15 @@ static void lerr_cb (lua_State *L, lnet_userdata *ud, err_t err)
 // --- Tables
 
 // Module function map
-LROT_BEGIN(net_tcpserver, NULL, 0)
+LROT_BEGIN(net_tcpserver, NULL, LROT_MASK_GC_INDEX)
   LROT_FUNCENTRY( __gc,    net_delete )
   LROT_TABENTRY ( __index, net_tcpserver )
   LROT_FUNCENTRY( listen,  net_listen )
   LROT_FUNCENTRY( getaddr, net_getaddr )
   LROT_FUNCENTRY( close,   net_close )
-LROT_END(net_tcpserver, NULL, 0)
+LROT_END(net_tcpserver, NULL, LROT_MASK_GC_INDEX)
 
-LROT_BEGIN(net_tcpsocket, NULL, 0)
+LROT_BEGIN(net_tcpsocket, NULL, LROT_MASK_GC_INDEX)
   LROT_FUNCENTRY( __gc,    net_delete )
   LROT_TABENTRY ( __index, net_tcpsocket )
   LROT_FUNCENTRY( connect, net_connect )
@@ -1126,9 +1126,9 @@ LROT_BEGIN(net_tcpsocket, NULL, 0)
   LROT_FUNCENTRY( dns,     net_dns )
   LROT_FUNCENTRY( getpeer, net_getpeer )
   LROT_FUNCENTRY( getaddr, net_getaddr )
-LROT_END(net_tcpsocket, NULL, 0)
+LROT_END(net_tcpsocket, NULL, LROT_MASK_GC_INDEX)
 
-LROT_BEGIN(net_udpsocket, NULL, 0)
+LROT_BEGIN(net_udpsocket, NULL, LROT_MASK_GC_INDEX)
   LROT_FUNCENTRY( __gc,    net_delete )
   LROT_TABENTRY ( __index, net_udpsocket )
   LROT_FUNCENTRY( listen,  net_listen )
@@ -1137,7 +1137,7 @@ LROT_BEGIN(net_udpsocket, NULL, 0)
   LROT_FUNCENTRY( send,    net_send )
   LROT_FUNCENTRY( dns,     net_dns )
   LROT_FUNCENTRY( getaddr, net_getaddr )
-LROT_END(net_udpsocket, NULL, 0)
+LROT_END(net_udpsocket, NULL, LROT_MASK_GC_INDEX)
 
 LROT_BEGIN(net_dns, NULL, 0)
   LROT_FUNCENTRY( setdnsserver, net_setdnsserver )
diff --git a/components/modules/pulsecnt.c b/components/modules/pulsecnt.c
index 83e11d5c..99d4b0e1 100644
--- a/components/modules/pulsecnt.c
+++ b/components/modules/pulsecnt.c
@@ -678,7 +678,7 @@ static int pulsecnt_unregister(lua_State* L){
   return 0;
 }
 
-LROT_BEGIN(pulsecnt_dyn, NULL, 0)
+LROT_BEGIN(pulsecnt_dyn, NULL, LROT_MASK_GC_INDEX)
   LROT_FUNCENTRY( __gc,           pulsecnt_unregister )
   LROT_TABENTRY ( __index,        pulsecnt_dyn )
   // LROT_FUNCENTRY( __tostring,     pulsecnt_tostring )
@@ -693,7 +693,7 @@ LROT_BEGIN(pulsecnt_dyn, NULL, 0)
   LROT_FUNCENTRY( setFilter,      pulsecnt_set_filter )
   LROT_FUNCENTRY( rawSetEventVal, pulsecnt_set_event_value )
   LROT_FUNCENTRY( rawGetEventVal, pulsecnt_get_event_value )
-LROT_END(pulsecnt_dyn, NULL, 0)
+LROT_END(pulsecnt_dyn, NULL, LROT_MASK_GC_INDEX)
 
 LROT_BEGIN(pulsecnt, NULL, 0)
   LROT_FUNCENTRY( create,            pulsecnt_create )
diff --git a/components/modules/sdmmc.c b/components/modules/sdmmc.c
index ad94f76d..15979983 100644
--- a/components/modules/sdmmc.c
+++ b/components/modules/sdmmc.c
@@ -327,14 +327,14 @@ static int lsdmmc_umount( lua_State *L )
   return luaL_error( L, err_msg );
 }
 
-LROT_BEGIN(sdmmc_card, NULL, 0)
+LROT_BEGIN(sdmmc_card, NULL, LROT_MASK_INDEX)
   LROT_TABENTRY( __index,   sdmmc_card )
   LROT_FUNCENTRY( read,     lsdmmc_read )
   LROT_FUNCENTRY( write,    lsdmmc_write )
   LROT_FUNCENTRY( get_info, lsdmmc_get_info )
   LROT_FUNCENTRY( mount,    lsdmmc_mount )
   LROT_FUNCENTRY( umount,   lsdmmc_umount )
-LROT_END(sdmmc_card, NULL, 0)
+LROT_END(sdmmc_card, NULL, LROT_MASK_INDEX)
 
 LROT_BEGIN(sdmmc, NULL, 0)
   LROT_FUNCENTRY( init,  lsdmmc_init )
diff --git a/components/modules/spi_master.c b/components/modules/spi_master.c
index 0642a8c6..39c80478 100644
--- a/components/modules/spi_master.c
+++ b/components/modules/spi_master.c
@@ -177,12 +177,12 @@ free_mem:
 }
 
 
-LROT_BEGIN(lspi_device, NULL, 0)
+LROT_BEGIN(lspi_device, NULL, LROT_MASK_GC_INDEX)
   LROT_FUNCENTRY( __gc,     lspi_device_free )
   LROT_TABENTRY( __index,   lspi_device )
   LROT_FUNCENTRY( transfer, lspi_device_transfer )
   LROT_FUNCENTRY( remove,   lspi_device_free )
-LROT_END(lspi_device, NULL, 0)
+LROT_END(lspi_device, NULL, LROT_MASK_GC_INDEX)
 
 
 // ****************************************************************************
@@ -320,12 +320,12 @@ static int lspi_host_device( lua_State *L )
 }
 
 
-LROT_BEGIN(lspi_master, NULL, 0)
+LROT_BEGIN(lspi_master, NULL, LROT_MASK_GC_INDEX)
   LROT_FUNCENTRY( __gc,    lspi_host_free )
   LROT_TABENTRY( __index,  lspi_master )
   LROT_FUNCENTRY( device,  lspi_host_device )
   LROT_FUNCENTRY( close,   lspi_host_free )
-LROT_END(lspi_master, NULL, 0)
+LROT_END(lspi_master, NULL, LROT_MASK_GC_INDEX)
 
 
 // ****************************************************************************
diff --git a/components/modules/tmr.c b/components/modules/tmr.c
old mode 100755
new mode 100644
index 85a3cea0..7fc5a2ca
--- a/components/modules/tmr.c
+++ b/components/modules/tmr.c
@@ -235,7 +235,7 @@ static int tmr_create( lua_State *L ) {
 
 // Module function map
 
-LROT_BEGIN(tmr_dyn, NULL, 0)
+LROT_BEGIN(tmr_dyn, NULL, LROT_MASK_GC_INDEX)
   LROT_FUNCENTRY( __gc,        tmr_unregister )
   LROT_TABENTRY ( __index,     tmr_dyn )
   LROT_FUNCENTRY( register,    tmr_register )
@@ -245,7 +245,7 @@ LROT_BEGIN(tmr_dyn, NULL, 0)
   LROT_FUNCENTRY( unregister,  tmr_unregister )
   LROT_FUNCENTRY( interval,    tmr_interval)
   LROT_FUNCENTRY( state,       tmr_state )
-LROT_END(tmr_dyn, NULL, 0)
+LROT_END(tmr_dyn, NULL, LROT_MASK_GC_INDEX)
 
 LROT_BEGIN(tmr, NULL, 0)
   LROT_FUNCENTRY( create,       tmr_create )
diff --git a/components/modules/touch.c b/components/modules/touch.c
index 367fcb8a..a1d2137b 100644
--- a/components/modules/touch.c
+++ b/components/modules/touch.c
@@ -589,7 +589,7 @@ static int touch_unregister(lua_State* L) {
   return 0;
 }
 
-LROT_BEGIN(touch_dyn, NULL, 0)
+LROT_BEGIN(touch_dyn, NULL, LROT_MASK_GC_INDEX)
   LROT_FUNCENTRY( __gc,           touch_unregister )
   LROT_TABENTRY ( __index,        touch_dyn )
   // LROT_FUNCENTRY( __tostring,     touch_tostring )
@@ -598,7 +598,7 @@ LROT_BEGIN(touch_dyn, NULL, 0)
   LROT_FUNCENTRY( intrDisable,    touch_intrDisable )
   LROT_FUNCENTRY( setThres,       touch_setThres )
   LROT_FUNCENTRY( setTriggerMode, touch_setTriggerMode )
-LROT_END(touch_dyn, NULL, 0)
+LROT_END(touch_dyn, NULL, LROT_MASK_GC_INDEX)
 
 LROT_BEGIN(touch, NULL, 0)
   LROT_FUNCENTRY( create,            touch_create )
diff --git a/components/modules/u8g2.c b/components/modules/u8g2.c
index 0ec828a2..e3b77549 100644
--- a/components/modules/u8g2.c
+++ b/components/modules/u8g2.c
@@ -558,8 +558,8 @@ static int lu8g2_updateDisplayArea( lua_State *L )
 }
 
 
-LROT_BEGIN(lu8g2_display, NULL, 0)
-  //LROT_FUNCENTRY( __gc,    lu8g2_display_free )
+LROT_BEGIN(lu8g2_display, NULL, LROT_MASK_INDEX)
+  //LROT_FUNCENTRY( __gc,    lu8g2_display_free ) // update LROT_MASK if enabled
   LROT_TABENTRY( __index, lu8g2_display )
   LROT_FUNCENTRY( clearBuffer,        lu8g2_clearBuffer )
   LROT_FUNCENTRY( drawBox,            lu8g2_drawBox )
@@ -602,7 +602,7 @@ LROT_BEGIN(lu8g2_display, NULL, 0)
   LROT_FUNCENTRY( setPowerSave,       lu8g2_setPowerSave )
   LROT_FUNCENTRY( updateDispla,       lu8g2_updateDisplay )
   LROT_FUNCENTRY( updateDisplayArea,  lu8g2_updateDisplayArea )
-LROT_END(lu8g2_display, NULL, 0)
+LROT_END(lu8g2_display, NULL, LROT_MASK_INDEX)
 
 
 uint8_t u8x8_d_overlay(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr);
diff --git a/components/modules/ucg.c b/components/modules/ucg.c
index 8f5df8a4..31671ad9 100644
--- a/components/modules/ucg.c
+++ b/components/modules/ucg.c
@@ -678,7 +678,7 @@ UCG_DISPLAY_TABLE
 
 
 // Module function map
-LROT_BEGIN(lucg_display, NULL, 0)
+LROT_BEGIN(lucg_display, NULL, LROT_MASK_GC_INDEX)
   LROT_FUNCENTRY( __gc,   lucg_close_display )
   LROT_TABENTRY( __index, lucg_display )
   LROT_FUNCENTRY( begin,              lucg_begin )
@@ -724,7 +724,7 @@ LROT_BEGIN(lucg_display, NULL, 0)
   LROT_FUNCENTRY( undoClipRange,      lucg_setMaxClipRange )
   LROT_FUNCENTRY( undoRotate,         lucg_undoRotate )
   LROT_FUNCENTRY( undoScale,          lucg_undoScale )
-LROT_END(lucg_display, NULL, 0)
+LROT_END(lucg_display, NULL, LROT_MASK_GC_INDEX)
 
 LROT_BEGIN(lucg, NULL, 0)
   LROT_TABENTRY( __metatable, lucg )
diff --git a/components/modules/ws2812.c b/components/modules/ws2812.c
index 2021dc1b..76a84523 100644
--- a/components/modules/ws2812.c
+++ b/components/modules/ws2812.c
@@ -497,7 +497,7 @@ static int ws2812_buffer_tostring(lua_State* L) {
   return 1;
 }
 
-LROT_BEGIN(ws2812_buffer, NULL, 0)
+LROT_BEGIN(ws2812_buffer, NULL, LROT_MASK_INDEX)
   LROT_FUNCENTRY( __concat,   ws2812_buffer_concat )
   LROT_TABENTRY ( __index,    ws2812_buffer )
   LROT_FUNCENTRY( __tostring, ws2812_buffer_tostring )
@@ -512,7 +512,7 @@ LROT_BEGIN(ws2812_buffer, NULL, 0)
   LROT_FUNCENTRY( shift,      ws2812_buffer_shift )
   LROT_FUNCENTRY( size,       ws2812_buffer_size )
   LROT_FUNCENTRY( sub,        ws2812_buffer_sub )
-LROT_END(ws2812_buffer, NULL, 0)
+LROT_END(ws2812_buffer, NULL, LROT_MASK_INDEX)
 
 LROT_BEGIN(ws2812, NULL, 0)
   LROT_FUNCENTRY( newBuffer,      ws2812_new_buffer )