diff --git a/components/lua/lua-5.3/ldebug.c b/components/lua/lua-5.3/ldebug.c
index 7f02f78c..aee12c3f 100644
--- a/components/lua/lua-5.3/ldebug.c
+++ b/components/lua/lua-5.3/ldebug.c
@@ -132,10 +132,11 @@ static const char *upvalname (Proto *p, int uv) {
 
 static const char *findvararg (CallInfo *ci, int n, StkId *pos) {
   int nparams = getnumparams(clLvalue(ci->func)->p);
-  if (n >= cast_int(ci->u.l.base - ci->func) - nparams)
+  int nvararg = cast_int(ci->u.l.base - ci->func) - nparams;
+  if (n <= -nvararg)
     return NULL;  /* no such vararg */
   else {
-    *pos = ci->func + nparams + n;
+    *pos = ci->func + nparams - n;
     return "(*vararg)";  /* generic name for any vararg */
   }
 }
@@ -147,7 +148,7 @@ static const char *findlocal (lua_State *L, CallInfo *ci, int n,
   StkId base;
   if (isLua(ci)) {
     if (n < 0)  /* access to vararg values? */
-      return findvararg(ci, -n, pos);
+      return findvararg(ci, n, pos);
     else {
       base = ci->u.l.base;
       name = luaF_getlocalname(ci_func(ci)->p, n, currentpc(ci));
diff --git a/components/modules/CMakeLists.txt b/components/modules/CMakeLists.txt
index 3719a39f..25279a26 100644
--- a/components/modules/CMakeLists.txt
+++ b/components/modules/CMakeLists.txt
@@ -8,6 +8,7 @@ set(module_srcs
   "dht.c"
   "encoder.c"
   "eromfs.c"
+  "espnow.c"
   "file.c"
   "gpio.c"
   "heaptrace.c"
diff --git a/components/modules/Kconfig b/components/modules/Kconfig
index 510c6fdc..2dd4af14 100644
--- a/components/modules/Kconfig
+++ b/components/modules/Kconfig
@@ -82,6 +82,12 @@ menu "NodeMCU modules"
             store the directory path as part of the filename just as SPIFFS
             does.
 
+    config NODEMCU_CMODULE_ESPNOW
+        bool "ESP-NOW module"
+        default "n"
+        help
+            Includes the espnow module.
+
     config NODEMCU_CMODULE_ETH
         depends on IDF_TARGET_ESP32
         select ETH_USE_ESP32_EMAC
diff --git a/components/modules/espnow.c b/components/modules/espnow.c
new file mode 100644
index 00000000..5507a9b3
--- /dev/null
+++ b/components/modules/espnow.c
@@ -0,0 +1,390 @@
+/*
+ * Copyright 2024 Dius Computing Pty Ltd. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the
+ *   distribution.
+ * - Neither the name of the copyright holders nor the names of
+ *   its contributors may be used to endorse or promote products derived
+ *   from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * @author Jade Mattsson <jmattsson@dius.com.au>
+ */
+#include "module.h"
+#include "platform.h"
+#include "ip_fmt.h"
+#include "task/task.h"
+#include "lauxlib.h"
+#include "esp_now.h"
+#include "esp_wifi.h"
+#include "esp_err.h"
+
+#if ESP_NOW_ETH_ALEN != 6
+# error "MAC address length assumption broken"
+#endif
+#if ESP_NOW_MAX_DATA_LEN > 0xffff
+# error "Update len field in received_packet_t"
+#endif
+
+typedef struct {
+  uint8_t src[6];
+  uint8_t dst[6];
+  int16_t rssi;
+  uint16_t len; // ESP_NOW_MAX_DATA_LEN is currently 250
+  char data[0];
+} received_packet_t;
+
+typedef struct {
+  uint8_t dst[6];
+  esp_now_send_status_t status;
+} sent_packet_t;
+
+
+static task_handle_t espnow_task = 0;
+
+static int recv_ref = LUA_NOREF;
+static int sent_ref = LUA_NOREF;
+
+
+// --- Helper functions -----------------------------------
+
+static int *cb_ref_for_event(const char *name)
+{
+  if (strcmp("receive", name) == 0)
+    return &recv_ref;
+  else if (strcmp("sent", name) == 0)
+    return &sent_ref;
+  else
+    return NULL;
+}
+
+static int hexval(lua_State *L, char c)
+{
+  if (c >= '0' && c <= '9')
+    return c - '0';
+  else if (c >= 'A' && c <= 'F')
+    return c - 'A' + 10;
+  else if (c >= 'a' && c <= 'f')
+    return c - 'a' + 10;
+  else
+    return luaL_error(L, "invalid hex digit '%c'", c);
+}
+
+// TODO: share with wifi_sta.c
+static bool parse_mac(const char *str, uint8_t out[6])
+{
+  const char *fmts[] = {
+    "%hhx%hhx%hhx%hhx%hhx%hhx",
+    "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
+    "%hhx-%hhx-%hhx-%hhx-%hhx-%hhx",
+    "%hhx %hhx %hhx %hhx %hhx %hhx",
+    NULL
+  };
+  for (unsigned i = 0; fmts[i]; ++i)
+  {
+    if (sscanf (str, fmts[i],
+          &out[0], &out[1], &out[2], &out[3], &out[4], &out[5]) == 6)
+      return true;
+  }
+  return false;
+}
+
+
+static void on_receive(const esp_now_recv_info_t *info, const uint8_t *data, int len)
+{
+  if (len < 0)
+    return; // Don't do that.
+
+  received_packet_t *p = malloc(sizeof(received_packet_t) + len);
+  if (!p)
+  {
+    NODE_ERR("out of memory\n");
+    return;
+  }
+  memcpy(p->src, info->src_addr, sizeof(p->src));
+  memcpy(p->dst, info->des_addr, sizeof(p->dst));
+  p->rssi = info->rx_ctrl->rssi;
+  p->len = len;
+  memcpy(p->data, data, len);
+
+  if (!task_post_high(espnow_task, (task_param_t)p))
+  {
+    NODE_ERR("lost esp-now packet; task queue full\n");
+    free(p);
+  }
+}
+
+
+static void on_sent(const uint8_t *mac, esp_now_send_status_t status)
+{
+  sent_packet_t *p = malloc(sizeof(sent_packet_t));
+  if (!p)
+  {
+    NODE_ERR("out of memory\n");
+    return;
+  }
+  memcpy(p->dst, mac, sizeof(p->dst));
+  p->status = status;
+
+  if (!task_post_medium(espnow_task, (task_param_t)p))
+  {
+    NODE_ERR("lost esp-now packet; task queue full\n");
+    free(p);
+  }
+}
+
+
+static void espnow_task_fn(task_param_t param, task_prio_t prio)
+{
+  lua_State* L = lua_getstate();
+  int top = lua_gettop(L);
+  luaL_checkstack(L, 3, "");
+
+  if (prio == TASK_PRIORITY_HIGH) // received packet
+  {
+    received_packet_t *p = (received_packet_t *)param;
+    if (recv_ref != LUA_NOREF)
+    {
+      lua_rawgeti (L, LUA_REGISTRYINDEX, recv_ref);
+      lua_createtable(L, 0, 4); // src, dst, rssi, data
+      char mac[MAC_STR_SZ];
+      macstr(mac, p->src);
+      lua_pushstring(L, mac);
+      lua_setfield(L, -2, "src");
+      macstr(mac, p->dst);
+      lua_pushstring(L, mac);
+      lua_setfield(L, -2, "dst");
+      lua_pushinteger(L, p->rssi);
+      lua_setfield(L, -2, "rssi");
+      lua_pushlstring(L, p->data, p->len);
+      lua_setfield(L, -2, "data");
+      luaL_pcallx(L, 1, 0);
+    }
+    free(p);
+  }
+  else if (prio == TASK_PRIORITY_MEDIUM) // sent
+  {
+    sent_packet_t *p = (sent_packet_t *)param;
+    if (sent_ref != LUA_NOREF)
+    {
+      lua_rawgeti (L, LUA_REGISTRYINDEX, sent_ref);
+      char dst[MAC_STR_SZ];
+      macstr(dst, p->dst);
+      lua_pushstring(L, dst);
+      if (p->status == ESP_NOW_SEND_SUCCESS)
+        lua_pushinteger(L, 1);
+      else
+        lua_pushnil(L);
+      luaL_pcallx(L, 2, 0);
+    }
+    free(p);
+  }
+
+  lua_settop(L, top); // restore original before exit
+}
+
+
+static void err_check(lua_State *L, esp_err_t err)
+{
+  if (err != ESP_OK)
+    luaL_error(L, "%s", esp_err_to_name(err));
+}
+
+
+// --- Lua interface functions -----------------------------------
+
+static int lespnow_start(lua_State *L)
+{
+  err_check(L, esp_now_init());
+  err_check(L, esp_now_register_recv_cb(on_receive));
+  err_check(L, esp_now_register_send_cb(on_sent));
+  return 0;
+}
+
+static int lespnow_stop(lua_State *L)
+{
+  err_check(L, esp_now_unregister_send_cb());
+  err_check(L, esp_now_unregister_recv_cb());
+  err_check(L, esp_now_deinit());
+  return 0;
+}
+
+static int lespnow_getversion(lua_State *L)
+{
+  uint32_t ver;
+  err_check(L, esp_now_get_version(&ver));
+  lua_pushinteger(L, ver);
+  return 1;
+}
+
+// espnow.on('sent' or 'received', cb)
+//   sent -> cb('ma:ca:dd:00:11:22', status)
+//   received -> cb({ src=, dst=, data=, rssi= })
+static int lespnow_on(lua_State *L)
+{
+  const char *evtname = luaL_checkstring(L, 1);
+  int *ref = cb_ref_for_event(evtname);
+  if (!ref)
+    return luaL_error(L, "unknown event type");
+
+  if (lua_isnoneornil(L, 2))
+  {
+    if (*ref != LUA_NOREF)
+    {
+      luaL_unref(L, LUA_REGISTRYINDEX, *ref);
+      *ref = LUA_NOREF;
+    }
+  }
+  else if (lua_isfunction(L, 2))
+  {
+    if (*ref != LUA_NOREF)
+      luaL_unref(L, LUA_REGISTRYINDEX, *ref);
+    lua_pushvalue(L, 2);
+    *ref = luaL_ref(L, LUA_REGISTRYINDEX);
+  }
+  else
+    return luaL_error(L, "expected function");
+  return 0;
+}
+
+// espnow.send('ma:ca:dd:00:11:22' or nil, str)
+static int lespnow_send(lua_State *L)
+{
+  const char *mac = luaL_optstring(L, 1, NULL);
+  size_t payloadlen = 0;
+  const char *payload = luaL_checklstring(L, 2, &payloadlen);
+
+  uint8_t peer_addr[6];
+  if (mac && !parse_mac(mac, peer_addr))
+    return luaL_error(L, "bad peer address");
+
+  err_check(L, esp_now_send(
+    mac ? peer_addr : NULL, (const uint8_t *)payload, payloadlen));
+  return 0;
+}
+
+
+// espnow.addpeer('ma:ca:dd:00:11:22', { lmk=, channel=, encrypt= }
+static int lespnow_addpeer(lua_State *L)
+{
+  esp_now_peer_info_t peer_info;
+  memset(&peer_info, 0, sizeof(peer_info));
+
+  const char *mac = luaL_checkstring(L, 1);
+
+  wifi_mode_t mode = WIFI_MODE_NULL;
+  err_check(L, esp_wifi_get_mode(&mode));
+
+  switch (mode)
+  {
+    case WIFI_MODE_STA: peer_info.ifidx = WIFI_IF_STA; break;
+    case WIFI_MODE_APSTA: // fall-through
+    case WIFI_MODE_AP: peer_info.ifidx = WIFI_IF_AP; break;
+    default: return luaL_error(L, "No wifi interface found");
+  }
+
+  if (!parse_mac(mac, peer_info.peer_addr))
+    return luaL_error(L, "bad peer address");
+
+  lua_settop(L, 2); // Discard excess parameters, to ensure we have space
+  if (lua_istable(L, 2))
+  {
+    lua_getfield(L, 2, "encrypt");
+    peer_info.encrypt = luaL_optint(L, -1, 0);
+    lua_pop(L, 1);
+    if (peer_info.encrypt)
+    {
+      lua_getfield(L, 2, "lmk");
+      size_t lmklen = 0;
+      const char *lmkstr = luaL_checklstring(L, -1, &lmklen);
+      lua_pop(L, 1);
+      if (lmklen != 2*sizeof(peer_info.lmk))
+        return luaL_error(L, "LMK must be %d hex digits", 2*ESP_NOW_KEY_LEN);
+      for (unsigned i = 0; i < sizeof(peer_info.lmk); ++i)
+        peer_info.lmk[i] =
+          (hexval(L, lmkstr[i*2]) << 4) + hexval(L, lmkstr[i*2 +1]);
+    }
+
+    lua_getfield(L, 2, "channel");
+    peer_info.channel = luaL_optint(L, -1, 0);
+    lua_pop(L, 1);
+  }
+
+  err_check(L, esp_now_add_peer(&peer_info));
+  return 0;
+}
+
+// espnow.delpeer('ma:ca:dd:00:11:22')
+static int lespnow_delpeer(lua_State *L)
+{
+  const char *mac = luaL_checkstring(L, 1);
+  uint8_t peer_addr[6];
+  if (!parse_mac(mac, peer_addr))
+    return luaL_error(L, "bad peer address");
+
+  err_check(L, esp_now_del_peer(peer_addr));
+  return 0;
+}
+
+static int lespnow_setpmk(lua_State *L)
+{
+  uint8_t pmk[ESP_NOW_KEY_LEN] = { 0, };
+  size_t len = 0;
+  const char *str = luaL_checklstring(L, 1, &len);
+  if (len != sizeof(pmk) * 2)
+    return luaL_error(L, "PMK must be %d hex digits", 2*ESP_NOW_KEY_LEN);
+  for (unsigned i = 0; i < sizeof(pmk); ++i)
+    pmk[i] = (hexval(L, str[i*2]) << 4) + hexval(L, str[i*2 +1]);
+
+  err_check(L, esp_now_set_pmk(pmk));
+  return 0;
+}
+
+static int lespnow_setwakewindow(lua_State *L)
+{
+  int n = luaL_checkint(L, 1);
+  if (n < 0 || n > 0xffff)
+    return luaL_error(L, "wake window out of bounds");
+  err_check(L, esp_now_set_wake_window(n));
+  return 0;
+}
+
+static int lespnow_init(lua_State *L)
+{
+  espnow_task = task_get_id(espnow_task_fn);
+  return 0;
+}
+
+LROT_BEGIN(espnow, NULL, 0)
+  LROT_FUNCENTRY( start,         lespnow_start )
+  LROT_FUNCENTRY( stop,          lespnow_stop )
+  LROT_FUNCENTRY( getversion,    lespnow_getversion )
+  LROT_FUNCENTRY( on,            lespnow_on ) // 'receive', 'sent'
+  LROT_FUNCENTRY( send,          lespnow_send )
+  LROT_FUNCENTRY( addpeer,       lespnow_addpeer )
+  LROT_FUNCENTRY( delpeer,       lespnow_delpeer )
+  LROT_FUNCENTRY( setpmk,        lespnow_setpmk )
+  LROT_FUNCENTRY( setwakewindow, lespnow_setwakewindow )
+LROT_END(espnow, NULL, 0)
+
+NODEMCU_MODULE(ESPNOW, "espnow", espnow, lespnow_init);
diff --git a/components/modules/struct.c b/components/modules/struct.c
index 7a6ebb7c..0cf7414c 100644
--- a/components/modules/struct.c
+++ b/components/modules/struct.c
@@ -93,12 +93,14 @@ typedef struct Header {
 } Header;
 
 
-static int getnum (const char **fmt, int df) {
+static int getnum (lua_State *L, const char **fmt, int df) {
   if (!isdigit((unsigned char)**fmt))  /* no number? */
     return df;  /* return default value */
   else {
     int a = 0;
     do {
+      if (a > (INT_MAX / 10) || a * 10 > (INT_MAX - (**fmt - '0')))
+        luaL_error(L, "integral size overflow");
       a = a*10 + *((*fmt)++) - '0';
     } while (isdigit((unsigned char)**fmt));
     return a;
@@ -121,9 +123,9 @@ static size_t optsize (lua_State *L, char opt, const char **fmt) {
     case 'd':  return sizeof(double);
 #endif
     case 'x': return 1;
-    case 'c': return getnum(fmt, 1);
+    case 'c': return getnum(L, fmt, 1);
     case 'i': case 'I': {
-      int sz = getnum(fmt, sizeof(int));
+      int sz = getnum(L, fmt, sizeof(int));
       if (sz > MAXINTSIZE)
         luaL_error(L, "integral size %d is larger than limit of %d",
                        sz, MAXINTSIZE);
@@ -156,7 +158,7 @@ static void controloptions (lua_State *L, int opt, const char **fmt,
     case '>': h->endian = BIG; return;
     case '<': h->endian = LITTLE; return;
     case '!': {
-      int a = getnum(fmt, MAXALIGN);
+      int a = getnum(L, fmt, MAXALIGN);
       if (!isp2(a))
         luaL_error(L, "alignment %d is not a power of 2", a);
       h->align = a;
diff --git a/components/modules/ws2812.c b/components/modules/ws2812.c
index 76a84523..fd7e9492 100644
--- a/components/modules/ws2812.c
+++ b/components/modules/ws2812.c
@@ -11,6 +11,14 @@
 #define SHIFT_LOGICAL  0
 #define SHIFT_CIRCULAR 1
 
+// The default bit H & L durations in multiples of 100ns.
+#define WS2812_DURATION_T0H 4
+#define WS2812_DURATION_T0L 7
+#define WS2812_DURATION_T1H 8
+#define WS2812_DURATION_T1L 6
+// The default reset duration in multiples of 100ns.
+#define WS2812_DURATION_RESET 512
+
 
 typedef struct {
   int size;
@@ -33,6 +41,7 @@ static void ws2812_cleanup( lua_State *L, int pop )
 // ws2812.write({pin = 4, data = string.char(255, 0, 0, 255, 255, 255)}) first LED green, second LED white.
 static int ws2812_write( lua_State* L )
 {
+  int type;
   int top = lua_gettop( L );
 
   for (int stack = 1; stack <= top; stack++) {
@@ -56,6 +65,106 @@ static int ws2812_write( lua_State* L )
     int gpio_num = luaL_checkint( L, -1 );
     lua_pop( L, 1 );
 
+    //
+    // retrieve reset
+    // This is an optional parameter which defaults to WS2812_DURATION_RESET.
+    //
+    int reset = WS2812_DURATION_RESET;
+    type = lua_getfield( L, stack, "reset" );
+    if (type!=LUA_TNIL )
+    {
+      if (!lua_isnumber( L, -1 )) {
+        ws2812_cleanup( L, 1 );
+        return luaL_argerror( L, stack, "invalid reset" );
+      }
+      reset = luaL_checkint( L, -1 );
+      if ((reset<0) || (reset>0xfffe)) {
+        ws2812_cleanup( L, 1 );
+        return luaL_argerror( L, stack, "reset must be 0<=reset<=65534" );
+      }
+    }
+    lua_pop( L, 1 );
+
+    //
+    // retrieve t0h
+    // This is an optional parameter which defaults to WS2812_DURATION_T0H.
+    //
+    int t0h = WS2812_DURATION_T0H;
+    type = lua_getfield( L, stack, "t0h" );
+    if (type!=LUA_TNIL )
+    {
+      if (!lua_isnumber( L, -1 )) {
+        ws2812_cleanup( L, 1 );
+        return luaL_argerror( L, stack, "invalid t0h" );
+      }
+      t0h = luaL_checkint( L, -1 );
+      if ((t0h<1) || (t0h>0x7fff)) {
+        ws2812_cleanup( L, 1 );
+        return luaL_argerror( L, stack, "t0h must be 1<=t0h<=32767" );
+      }
+    }
+    lua_pop( L, 1 );
+
+    //
+    // retrieve t0l
+    // This is an optional parameter which defaults to WS2812_DURATION_T0L.
+    //
+    int t0l = WS2812_DURATION_T0L;
+    type = lua_getfield( L, stack, "t0l" );
+    if (type!=LUA_TNIL )
+    {
+      if (!lua_isnumber( L, -1 )) {
+        ws2812_cleanup( L, 1 );
+        return luaL_argerror( L, stack, "invalid t0l" );
+      }
+      t0l = luaL_checkint( L, -1 );
+      if ((t0l<1) || (t0l>0x7fff)) {
+        ws2812_cleanup( L, 1 );
+        return luaL_argerror( L, stack, "t0l must be 1<=t0l<=32767" );
+      }
+    }
+    lua_pop( L, 1 );
+
+    //
+    // retrieve t1h
+    // This is an optional parameter which defaults to WS2812_DURATION_T1H.
+    //
+    int t1h = WS2812_DURATION_T1H;
+    type = lua_getfield( L, stack, "t1h" );
+    if (type!=LUA_TNIL )
+    {
+      if (!lua_isnumber( L, -1 )) {
+        ws2812_cleanup( L, 1 );
+        return luaL_argerror( L, stack, "invalid t1h" );
+      }
+      t1h = luaL_checkint( L, -1 );
+      if ((t1h<1) || (t1h>0x7fff)) {
+        ws2812_cleanup( L, 1 );
+        return luaL_argerror( L, stack, "t1h must be 1<=t1h<=32767" );
+      }
+    }
+    lua_pop( L, 1 );
+
+    //
+    // retrieve t1l
+    // This is an optional parameter which defaults to WS2812_DURATION_T1L.
+    //
+    int t1l = WS2812_DURATION_T1L;
+    type = lua_getfield( L, stack, "t1l" );
+    if (type!=LUA_TNIL )
+    {
+      if (!lua_isnumber( L, -1 )) {
+        ws2812_cleanup( L, 1 );
+        return luaL_argerror( L, stack, "invalid t1l" );
+      }
+      t1l = luaL_checkint( L, -1 );
+      if ((t1l<1) || (t1l>0x7fff)) {
+        ws2812_cleanup( L, 1 );
+        return luaL_argerror( L, stack, "t1l must be 1<=t1l<=32767" );
+      }
+    }
+    lua_pop( L, 1 );
+
     //
     // retrieve data
     //
@@ -83,7 +192,7 @@ static int ws2812_write( lua_State* L )
     lua_pop( L, 1 );
 
     // prepare channel
-    if (platform_ws2812_setup( gpio_num, 1, (const uint8_t *)data, length ) != PLATFORM_OK) {
+    if (platform_ws2812_setup( gpio_num, reset, t0h, t0l, t1h, t1l, (const uint8_t *)data, length ) != PLATFORM_OK) {
       ws2812_cleanup( L, 0 );
       return luaL_argerror( L, stack, "can't set up chain" );
     }
diff --git a/components/platform/include/platform.h b/components/platform/include/platform.h
index 5c0929a4..2706a9de 100644
--- a/components/platform/include/platform.h
+++ b/components/platform/include/platform.h
@@ -209,7 +209,7 @@ int platform_dht_read( uint8_t gpio_num, uint8_t wakeup_ms, uint8_t *data );
 // WS2812 platform interface
 
 void platform_ws2812_init( void );
-int platform_ws2812_setup( uint8_t gpio_num, uint8_t num_mem, const uint8_t *data, size_t len );
+int platform_ws2812_setup( uint8_t gpio_num, uint32_t reset, uint32_t bit0h, uint32_t bit0l, uint32_t bit1h, uint32_t bit1l, const uint8_t *data, size_t len );
 int platform_ws2812_release( void );
 int platform_ws2812_send( void );
 
diff --git a/components/platform/ws2812.c b/components/platform/ws2812.c
index d00510cb..21c14a4c 100644
--- a/components/platform/ws2812.c
+++ b/components/platform/ws2812.c
@@ -32,112 +32,180 @@
 #include "soc/periph_defs.h"
 #include "rom/gpio.h" // for gpio_matrix_out()
 #include "soc/gpio_periph.h"
+#include "soc/rmt_reg.h"
 
 #undef WS2812_DEBUG
 
-// If either of these fails, the reset logic in ws2812_sample_to_rmt will need revisiting.
-_Static_assert(SOC_RMT_MEM_WORDS_PER_CHANNEL % 8 == 0,
-  "SOC_RMT_MEM_WORDS_PER_CHANNEL is assumed to be a multiple of 8");
-_Static_assert(SOC_RMT_MEM_WORDS_PER_CHANNEL >= 16,
-  "SOC_RMT_MEM_WORDS_PER_CHANNEL is assumed to be >= 16");
-
 // divider to generate 100ns base period from 80MHz APB clock
 #define WS2812_CLKDIV (100 * 80 /1000)
-// bit H & L durations in multiples of 100ns
-#define WS2812_DURATION_T0H 4
-#define WS2812_DURATION_T0L 7
-#define WS2812_DURATION_T1H 8
-#define WS2812_DURATION_T1L 6
-#define WS2812_DURATION_RESET (50000 / 100)
-
-// 0 bit in rmt encoding
-const rmt_item32_t ws2812_rmt_bit0 = {
-  .level0    = 1,
-  .duration0 = WS2812_DURATION_T0H,
-  .level1    = 0,
-  .duration1 = WS2812_DURATION_T0L
-};
-// 1 bit in rmt encoding
-const rmt_item32_t ws2812_rmt_bit1 = {
-  .level0    = 1,
-  .duration0 = WS2812_DURATION_T1H,
-  .level1    = 0,
-  .duration1 = WS2812_DURATION_T1L
-};
-
-// This is one eighth of 512 * 100ns, ie in total a bit above the requisite 50us
-const rmt_item32_t ws2812_rmt_reset = { .level0 = 0, .duration0 = 32, .level1 = 0, .duration1 = 32 };
 
 // descriptor for a ws2812 chain
 typedef struct {
   bool valid;
   bool needs_reset;
   uint8_t gpio;
+  rmt_item32_t reset;
+  rmt_item32_t bits[2];
   const uint8_t *data;
   size_t len;
+  uint8_t bitpos;
 } ws2812_chain_t;
 
 // chain descriptor array
 static ws2812_chain_t ws2812_chains[RMT_CHANNEL_MAX];
 
-#define MIN(a, b) ((a) < (b) ? (a) : (b))
-
 static void ws2812_sample_to_rmt(const void *src, rmt_item32_t *dest, size_t src_size, size_t wanted_num, size_t *translated_size, size_t *item_num)
 {
-  // Note: enabling these commented-out logs will ruin the timing so nothing
-  // will actually work when they're enabled. But I've kept them in as comments
-  // because they were useful in debugging the buffer management.
-  // ESP_DRAM_LOGW("ws2812", "ws2812_sample_to_rmt wanted=%u src_size=%u", wanted_num, src_size);
+  size_t cnt_in;
+  size_t cnt_out;
+  const uint8_t *pucData;
+  uint8_t ucData;
+  uint8_t ucBitPos;
+  esp_err_t tStatus;
+  void *pvContext;
+  ws2812_chain_t *ptContext;
+  uint8_t ucBit;
 
-  void *ctx;
-  rmt_translator_get_context(item_num, &ctx);
-  ws2812_chain_t *chain = (ws2812_chain_t *)ctx;
+  cnt_in = 0;
+  cnt_out = 0;
+  if( dest!=NULL && wanted_num>0 )
+  {
+    tStatus = rmt_translator_get_context(item_num, &pvContext);
+    if( tStatus==ESP_OK )
+    {
+      ptContext = (ws2812_chain_t *)pvContext;
 
-  size_t reset_num = 0;
-  if (chain->needs_reset) {
-    // Haven't sent reset yet
+      if( ptContext->needs_reset==true )
+      {
+        dest[cnt_out++] = ptContext->reset;
+        ptContext->needs_reset = false;
+      }
+      if( src!=NULL && src_size>0 )
+      {
+        ucBitPos = ptContext->bitpos;
 
-    // We split the reset into 8 even though it would fit in a single
-    // rmt_item32_t, simply so that dest stays 8-item aligned which means we
-    // don't have to worry about having to split a byte of src across multiple
-    // blocks (assuming the static asserts at the top of this file are true).
-    for (int i = 0; i < 8; i++) {
-      dest[i] = ws2812_rmt_reset;
-    }
-    dest += 8;
-    wanted_num -= 8;
-    reset_num = 8;
-    chain->needs_reset = false;
-  }
+        /* Each bit of the input data is converted into one RMT item. */
 
-  // Now write the actual data from src
-  const uint8_t *data = (const uint8_t *)src;
-  size_t data_num = MIN(wanted_num, src_size * 8) / 8;
-  for (size_t idx = 0; idx < data_num; idx++) {
-    uint8_t byte = data[idx];
-    for (uint8_t i = 0; i < 8; i++) {
-      dest[idx * 8 + i] = (byte & 0x80) ? ws2812_rmt_bit1 : ws2812_rmt_bit0;
-      byte <<= 1;
+        pucData = (const uint8_t*)src;
+        /* Get the current byte. */
+        ucData = pucData[cnt_in] << ucBitPos;
+
+        while( cnt_in<src_size && cnt_out<wanted_num )
+        {
+          /* Get the current bit. */
+          ucBit = (ucData & 0x80U) >> 7U;
+          /* Translate the bit to a WS2812 input code. */
+          dest[cnt_out++] = ptContext->bits[ucBit];
+          /* Move to the next bit. */
+          ++ucBitPos;
+          if( ucBitPos<8U )
+          {
+            ucData <<= 1;
+          }
+          else
+          {
+            ucBitPos = 0U;
+            ++cnt_in;
+            ucData = pucData[cnt_in];
+          }
+        }
+
+        ptContext->bitpos = ucBitPos;
+      }
     }
   }
-
-  *translated_size = data_num;
-  *item_num = reset_num + data_num * 8;
-  // ESP_DRAM_LOGW("ws2812", "src bytes consumed: %u total rmt items: %u", *translated_size, *item_num);
+  *translated_size = cnt_in;
+  *item_num = cnt_out;
 }
 
-int platform_ws2812_setup( uint8_t gpio_num, uint8_t num_mem, const uint8_t *data, size_t len )
+int platform_ws2812_setup( uint8_t gpio_num, uint32_t reset, uint32_t t0h, uint32_t t0l, uint32_t t1h, uint32_t t1l, const uint8_t *data, size_t len )
 {
   int channel;
 
-  if ((channel = platform_rmt_allocate( num_mem, RMT_MODE_TX )) >= 0) {
+  if ((channel = platform_rmt_allocate( 1, RMT_MODE_TX )) >= 0) {
     ws2812_chain_t *chain = &(ws2812_chains[channel]);
+    rmt_item32_t tRmtItem;
+    uint32_t half;
 
     chain->valid = true;
     chain->gpio = gpio_num;
     chain->len = len;
     chain->data = data;
-    chain->needs_reset = true;
+    chain->bitpos = 0;
+
+    // Send a reset if "reset" is not 0.
+    chain->needs_reset = (reset != 0);
+
+    // Construct the RMT item for a reset.
+    tRmtItem.level0 = 0;
+    tRmtItem.level1 = 0;
+    // The reset duration must fit into one RMT item. This leaves 2*15 bit,
+    // which results in a maximum of 0xfffe .
+    if (reset>0xfffe)
+    {
+      reset = 0xfffe;
+    }
+    if (reset>0x7fff)
+    {
+      tRmtItem.duration0 = 0x7fff;
+      tRmtItem.duration1 = reset - 0x7fff;
+    }
+    else
+    {
+      half = reset >> 1U;
+      tRmtItem.duration0 = half;
+      tRmtItem.duration1 = reset - half;
+    }
+    chain->reset = tRmtItem;
+
+    // Limit the bit times to the available 15 bits.
+    // The values must not be 0.
+    if( t0h==0 )
+    {
+      t0h = 1;
+    }
+    else if( t0h>0x7fffU )
+    {
+      t0h = 0x7fffU;
+    }
+    if( t0l==0 )
+    {
+      t0l = 1;
+    }
+    else if( t0l>0x7fffU )
+    {
+      t0l = 0x7fffU;
+    }
+    if( t1h==0 )
+    {
+      t1h = 1;
+    }
+    else if( t1h>0x7fffU )
+    {
+      t1h = 0x7fffU;
+    }
+    if( t1l==0 )
+    {
+      t1l = 1;
+    }
+    else if( t1l>0x7fffU )
+    {
+      t1l = 0x7fffU;
+    }
+
+    // Construct the RMT item for a 0 bit.
+    tRmtItem.level0 = 1;
+    tRmtItem.duration0 = t0h;
+    tRmtItem.level1 = 0;
+    tRmtItem.duration1 = t0l;
+    chain->bits[0] = tRmtItem;
+
+    // Construct the RMT item for a 1 bit.
+    tRmtItem.level0 = 1;
+    tRmtItem.duration0 = t1h;
+    tRmtItem.level1 = 0;
+    tRmtItem.duration1 = t1l;
+    chain->bits[1] = tRmtItem;
 
 #ifdef WS2812_DEBUG
     ESP_LOGI("ws2812", "Setup done for gpio %d on RMT channel %d", gpio_num, channel);
@@ -210,6 +278,19 @@ int platform_ws2812_send( void )
     }
   }
 
+  // Try to add all channels to a group. This moves the start of all RMT sequences closer
+  // together.
+#if SOC_RMT_SUPPORT_TX_SYNCHRO
+  for (rmt_channel_t channel = 0; channel < RMT_CHANNEL_MAX && res == PLATFORM_OK; channel++) {
+    if (ws2812_chains[channel].valid) {
+      if (rmt_add_channel_to_group( channel ) != ESP_OK) {
+        res = PLATFORM_ERR;
+        break;
+      }
+    }
+  }
+#endif
+
   // start selected channels one by one
   for (rmt_channel_t channel = 0; channel < RMT_CHANNEL_MAX && res == PLATFORM_OK; channel++) {
     if (ws2812_chains[channel].valid) {
@@ -229,6 +310,17 @@ int platform_ws2812_send( void )
     }
   }
 
+#if SOC_RMT_SUPPORT_TX_SYNCHRO
+  for (rmt_channel_t channel = 0; channel < RMT_CHANNEL_MAX; channel++) {
+    if (ws2812_chains[channel].valid) {
+      if (rmt_remove_channel_from_group( channel ) != ESP_OK) {
+        res = PLATFORM_ERR;
+        break;
+      }
+    }
+  }
+#endif
+
   return res;
 }
 
diff --git a/docs/index.md b/docs/index.md
index 5a2072a7..e6e0923d 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -1,10 +1,12 @@
 # NodeMCU Documentation
 
-NodeMCU is an open source [Lua](https://www.lua.org/) based firmware for the [ESP32](http://espressif.com/en/products/hardware/esp32/overview) and [ESP8266 WiFi SOC from Espressif](http://espressif.com/en/products/esp8266/) and uses an on-module flash-based [SPIFFS](https://github.com/pellepl/spiffs) file system. NodeMCU is implemented in C and is layered on the [Espressif ESP-IDF](https://github.com/espressif/ESP-IDF).
+NodeMCU is an open source [Lua](https://www.lua.org/) based firmware for the [ESP32](https://www.espressif.com/en/products/socs/esp32) and [ESP8266](https://www.espressif.com/en/products/socs/esp8266) WiFi SOCs from Espressif. It uses an on-module flash-based [SPIFFS](https://github.com/pellepl/spiffs) file system. NodeMCU is implemented in C and the ESP32 version is layered on the [Espressif ESP-IDF](https://github.com/espressif/ESP-IDF).
 
 The firmware was initially developed as is a companion project to the popular ESP8266-based [NodeMCU development modules](https://github.com/nodemcu/nodemcu-devkit-v1.0), but the project is now community-supported, and the firmware can now be run on _any_ ESP module.
 
-Support for the new [ESP32 WiFi/BlueTooth SOC from Espressif](http://www.espressif.com/en/products/hardware/esp32/overview) is under way.
+!!! important
+
+    The NodeMCU [`release`](https://github.com/nodemcu/nodemcu-firmware/tree/release) and [`dev`](https://github.com/nodemcu/nodemcu-firmware/tree/dev) branches target the ESP8266. The [`dev-esp32`](https://github.com/nodemcu/nodemcu-firmware/tree/dev-esp32) branch targets the ESP32.
 
 ## Up-To-Date Documentation
 At the moment the only up-to-date documentation maintained by the current NodeMCU team is in English. It is part of the source code repository (`/docs` subfolder) and kept in sync with the code.
diff --git a/docs/js/extra.js b/docs/js/extra.js
index 2653f4a7..fd2a2870 100644
--- a/docs/js/extra.js
+++ b/docs/js/extra.js
@@ -27,7 +27,7 @@ var nodemcu = nodemcu || {};
     }
     function isModulePage() {
       // if the breadcrumb contains 'Modules »' it must be an API page
-      return $("ul.wy-breadcrumbs li:contains('Modules »')").size() > 0;
+      return $("ul.wy-breadcrumbs li:contains('C Modules')").length > 0;
     }
     function createTocTableRow(func, intro) {
       // fragile attempt to auto-create the in-page anchor
diff --git a/docs/modules/espnow.md b/docs/modules/espnow.md
new file mode 100644
index 00000000..b491e1fb
--- /dev/null
+++ b/docs/modules/espnow.md
@@ -0,0 +1,248 @@
+# ESP-NOW Module
+| Since  | Origin / Contributor  | Maintainer  | Source  |
+| :----- | :-------------------- | :---------- | :------ |
+| 2024-03-07 | [DiUS](https://github.com/DiUS) [Jade Mattsson](https://github.com/jmattsson) |[Jade Mattsson](https://github.com/jmattsson) | [espnow.c](../../components/modules/espnow.c)|
+
+The `espnow` module provides an interface to Espressif's [ESP-NOW functionality](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/network/esp_now.html). To quote their documentation directly:
+
+"ESP-NOW is a kind of connectionless Wi-Fi communication protocol that is defined by Espressif. In ESP-NOW, application data is encapsulated in a vendor-specific action frame and then transmitted from one Wi-Fi device to another without connection."
+
+Packets can be sent to either individual peers, the whole list of defined peers, or broadcast to everyone in range. For non-broadcast packets, ESP-NOW provides optional encryption support to prevent eavesdropping. To use encryption, a "Primary Master Key" (PMK) should first be set. When registering a peer, a peer-specific "Local Master Key" (LMK) is then given, which is further encrypted by the PMK. All packets sent to that peer will be encrypted with the resulting key.
+
+To broadcast packets, a peer with address 'ff:ff:ff:ff:ff:ff' must first be registered. Broadcast packets do not support encryption, and attempting to enable encrypting when registering the broadcast peer will result in an error.
+
+ESP-NOW uses a WiFi vendor-specific action frame to transmit data, and as such it requires the WiFi stack to have been started before ESP-NOW packets can be sent and received.
+
+
+## espnow.start
+
+Starts the ESP-NOW stack. While this may be called prior to `wifi.start()`, packet transmission and reception will not be possible until after the WiFi stack has been started.
+
+#### Syntax
+```lua
+espnow.start()
+```
+
+#### Parameters
+None.
+
+#### Returns
+`nil`
+
+An error will be raised if the ESP-NOW stack cannot be started.
+
+
+## espnow.stop
+
+Stops the ESP-NOW stack.
+
+#### Syntax
+```lua
+espnow.stop()
+```
+
+#### Parameters
+None.
+
+#### Returns
+`nil`
+
+An error will be raised if the ESP-NOW stack cannot be stopped.
+
+
+## espnow.getversion
+
+Returns the raw version number enum value. Currently, it is `1`. Might be useful for checking version compatibility in the future.
+
+#### Syntax
+```lua
+ver = espnow.getversion()
+```
+
+#### Parameters
+None.
+
+#### Returns
+An integer representing the ESP-NOW version.
+
+
+## espnow.setpmk
+
+Sets the Primary Master Key (PMK). When using security, this should be done prior to adding any peers, as their LMKs will be encrypted by the current PMK.
+
+#### Syntax
+```lua
+espnow.setpmk(pmk)
+```
+#### Parameters
+`pmk`  The Primary Master Key, given as a hex-encoding of a 16-byte key (i.e. the `pmk` should consist of 32 hex digits.
+
+#### Returns
+`nil`
+
+An error will be raised if the PMK cannot be set.
+
+#### Example
+```lua
+espnow.setpmk('00112233445566778899aabbccddeeff')
+```
+
+
+## espnow.setwakewindow
+
+Controls the wake window during which ESP-NOW listens. In most cases this should never need to be changed from the default. Refer to the Espressif documentation for further details.
+
+#### Syntax
+```lua
+espnow.setwakewindow(window)
+```
+
+#### Parameters
+`window`  An integer between 0 and 65535.
+
+#### Returns
+`nil`
+
+
+## espnow.addpeer
+
+Registers a peer MAC address. Optionally parameters for the peer may be included, such as encryption key.
+
+#### Syntax
+```lua
+espnow.addpeer(mac, options)
+```
+#### Parameters
+- `mac`  The peer mac address, given as a string in `00:11:22:33:44:55` format (colons optional, and may also be replaced by '-' or ' ').
+- `options`  A table with with following entries:
+  - `channel`  An integer indicating the WiFi channel to be used. The default is `0`, indicating that the current WiFi channel should be used. If non-zero, must match the current WiFi channel.
+  - `lmk`  The LMK for the peer, if encryption is to be used.
+  - `encrypt`  A non-zero integer to indicate encryption should be enabled. When set, makes `lmk` a required field.
+
+#### Returns
+`nil`
+
+An error will be raised if a peer cannot be added, such as if the peer list if full, or the peer has already been added.
+
+#### Examples
+
+Adding a peer without encryption enabled.
+```lua
+espnow.addpeer('7c:df:a1:c1:4c:71')
+```
+
+Adding a peer with encryption enabled. Please use randomly generated keys instead of these easily guessable placeholders.
+```lua
+espnow.setpmk('ffeeddccbbaa99887766554433221100')
+espnow.addpeer('7c:df:a1:c1:4c:71', { encrypt = 1, lmk = '00112233445566778899aabbccddeeff' })
+```
+
+## espnow.delpeer
+
+Deletes a previously added peer from the internal peer list.
+
+#### Syntax
+```lua
+espnow.delpeer(mac)
+```
+
+#### Parameters
+`mac`  The MAC address of the peer to delete.
+
+#### Returns
+`nil`
+
+Returns an error if the peer cannot be deleted.
+
+
+## espnow.on
+
+Registers or unregisters callback handlers for the ESP-NOW events.
+
+There are two events available, `sent` which is issued in response to a packet send request and which reports the status of the send attempt, and 'receive' which is issued when an ESP-NOW packet is successfully received.
+
+Only a single callback function can be registered for each event.
+
+The callback function for the `sent` event is invoked with two parameters, the destination MAC address, and a `1`/`nil` to indicate whether the send was believed to be successful or not.
+
+The callback function for the `receive` event is invoked with a single parameter, a table with the following keys:
+
+- `src`  The sender MAC address
+- `dst`  The destination MAC address (likely either the local MAC of the receiver, or the broadcast address)
+- `rssi`  The RSSI value from the packet, indicating signal strength between the two devices
+- `data`  The actual payload data, as a string. The string may contain binary data.
+
+#### Syntax
+```lua
+espnow.on(event, callbackfn)
+```
+
+#### Parameters
+- `event`  The event name, one of `sent` or `receive`.
+- `callbackfn`  The callback function to register, or `nil` to unregister the previously set callback function for the event.
+
+#### Returns
+`nil`
+
+Raises an error if invalid arguments are given.
+
+#### Example
+Registering callback handlers.
+```lua
+espnow.on('sent',
+  function(mac, success) print(mac, success and 'Yay!' or 'Noooo') end)
+espnow.on('receive',
+  function(t) print(t.src, '->', t.dst, '@', t.rssi, ':', t.data) end)
+```
+
+Unregistering callback handlers.
+```lua
+espnow.on('sent') -- implicit nil
+espnow.on('receive', nil)
+```
+
+
+## espnow.send
+
+Attempts to send an ESP-NOW packet to one or more peers.
+
+In general it is strongly recommended to use the encryption functionality, as this ensures not only secrecy but also prevent unintentional interference between different users of ESP-NOW.
+
+If you do need to use broadcasts or multicasts, you should make sure to have a unique, recognisable marker at the start of the payload to make filtering out unwanted messages easy, both for you and other ESP-NOW users.
+
+#### Syntax
+```lua
+espnow.send(peer, data)
+```
+
+#### Parameters
+- `peer`  The peer MAC address to send to. Must have previously been added via `espnow.addpeer()`. If `peer` is given as `nil`, the packet is sent to all registered non-broadcast/multicast peers, and the `sent` callback is invoked for each of those peers.
+- `data`  A string of data to send. May contain binary bytes. Maximum supported length at the time of writing is 250 bytes.
+
+#### Returns
+`nil`, but the `sent` callback is invoked with the status afterwards.
+
+Raises an error if the peer is not valid, or other fatal errors preventing a send attempt from even being made. The `sent` callback will not be invoked in this case.
+
+#### Example
+Broadcasting a message to every single ESP-NOW device in range.
+```lua
+bcast='ff:ff:ff:ff:ff:ff'
+espnow.addpeer(bcast)
+espnow.send(bcast, '[NodeMCU] Hello, world!')
+```
+
+Sending a directed message to one specific ESP-NOW device.
+```lua
+peer='7c:df:a1:c1:4c:71'
+espnow.addpeer(peer)
+espnow.send(peer, 'Hello, you!')
+```
+
+Sending a message to all registered peers.
+```lua
+espnow.addpeer('7c:df:a1:c1:4c:71')
+espnow.addpeer('7c:df:a1:c1:4c:47')
+espnow.addpeer('7c:df:a1:c1:4f:12')
+espnow.send(nil, 'Hello, peers!')
+```
diff --git a/docs/modules/rtcmem.md b/docs/modules/rtcmem.md
index bd4020dd..613feaa0 100644
--- a/docs/modules/rtcmem.md
+++ b/docs/modules/rtcmem.md
@@ -1,7 +1,7 @@
 # RTC User Memory Module
 | Since  | Origin / Contributor  | Maintainer  | Source  |
 | :----- | :-------------------- | :---------- | :------ |
-| 2015-06-25 | [DiUS](https://github.com/DiUS), [Johny Mattsson](https://github.com/jmattsson) | [PJSG](https://github.com/pjsg) | [rtcmem.c](../../app/modules/rtcmem.c)|
+| 2015-06-25 | [DiUS](https://github.com/DiUS), [Jade Mattsson](https://github.com/jmattsson) | [PJSG](https://github.com/pjsg) | [rtcmem.c](../../components/modules/rtcmem.c)|
 
 The rtcmem module provides basic access to the RTC memory. 
 
diff --git a/docs/modules/ws2812.md b/docs/modules/ws2812.md
index c408b096..c4ae1c4c 100644
--- a/docs/modules/ws2812.md
+++ b/docs/modules/ws2812.md
@@ -1,7 +1,7 @@
 # WS2812 Module
 | Since  | Origin / Contributor  | Maintainer  | Source  |
 | :----- | :-------------------- | :---------- | :------ |
-| 2015-02-05 | [Till Klocke](https://github.com/dereulenspiegel), [Thomas Soëte](https://github.com/Alkorin) | [Arnim Läuger](https://github.com/devsaurus) | [ws2812.c](../../components/modules/ws2812.c)|
+| 2015-02-05 | [Till Klocke](https://github.com/dereulenspiegel), [Thomas Soëte](https://github.com/Alkorin), [Christoph Thelen](https://github.com/docbacardi) | [Arnim Läuger](https://github.com/devsaurus) | [ws2812.c](../../components/modules/ws2812.c)|
 
 ws2812 is a library to handle ws2812-like led strips.
 It works at least on WS2812, WS2812b, APA104, SK6812 (RGB or RGBW).
@@ -22,6 +22,14 @@ Variable number of tables, each describing a single strip. Required elements are
 - `pin` IO index, see [GPIO Overview](gpio.md#gpio-overview)
 - `data` payload to be sent to one or more WS2812 like leds through GPIO2
 
+Optional elements are:
+
+- `reset` duration of the reset signal in multiples of 100ns. A duration of 0 generates no reset. The minimum possible value is 0. The maximum is 65534. The default value is 512 which generates a reset of 51.2us.
+- `t0h` duration of the high period for a 0 code in multiples of 100ns. The minimum possible value is 1. The maximum is 32767. The default value is 4 which results in a high period of 400ns for each 0 code.
+- `t0l` duration of the low period for a 0 code in multiples of 100ns. The minimum possible value is 1. The maximum is 32767. The default value is 7 which results in a low period of 700ns for each 0 code.
+- `t1h` duration of the high period for a 1 code in multiples of 100ns. The minimum possible value is 1. The maximum is 32767. The default value is 8 which results in a high period of 800ns for each 1 code.
+- `t1l` duration of the low period for a 1 code in multiples of 100ns. The minimum possible value is 1. The maximum is 32767. The default value is 6 which results in a low period of 600ns for each 1 code.
+
 Payload type could be:
 
 - `string` representing bytes to send
@@ -44,6 +52,10 @@ ws2812.write({pin =  4, data = string.char(255, 0, 0, 255, 0, 0)},
              {pin = 14, data = string.char(0, 255, 0, 0, 255, 0)}) -- turn the two first RGB leds to green on the first strip and red on the second strip
 ```
 
+```lua
+ws2812.write({pin = 8, reset = 800, t0h = 3, t0l = 9, t1h = 6, t1l = 6, data = string.char(1, 0, 0)}) -- turn the SK6812 GRB led on the ESP32-C3-DevKitM-1 to green
+```
+
 # Buffer module
 For more advanced animations, it is useful to keep a "framebuffer" of the strip,
 interact with it and flush it to the strip.
diff --git a/docs/requirements.txt b/docs/requirements.txt
index ba6e4ea8..f26ede80 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,2 +1,2 @@
-mkdocs==1.2.2
-jinja2<3.1
+mkdocs>=1.5.3
+jinja2>=3.1.0
diff --git a/mkdocs.yml b/mkdocs.yml
index ce5dfd87..8682c4c9 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -20,7 +20,7 @@ extra_css:
 extra_javascript:
   - js/extra.js
 
-pages:
+nav:
   - Overview: 'index.md'
   - Basics:
       - Building the firmware: 'build.md'
@@ -48,6 +48,7 @@ pages:
       - 'dht': 'modules/dht.md'
       - 'encoder': 'modules/encoder.md'
       - 'eromfs': 'modules/eromfs.md'
+      - 'espnow': 'modules/espnow.md'
       - 'eth': 'modules/eth.md'
       - 'file': 'modules/file.md'
       - 'gpio': 'modules/gpio.md'
@@ -66,6 +67,7 @@ pages:
       - 'pulsecnt': 'modules/pulsecnt.md'
       - 'qrcodegen': 'modules/qrcodegen.md'
       - 'rmt': 'modules/rmt.md'
+      - 'rtcmem': 'modules/rtcmem.md'
       - 'sdmmc': 'modules/sdmmc.md'
       - 'sigma delta': 'modules/sigma-delta.md'
       - 'sjson': 'modules/sjson.md'