diff --git a/CODEOWNERS b/CODEOWNERS
index 22e46aa2f0..3920a9100e 100644
--- a/CODEOWNERS
+++ b/CODEOWNERS
@@ -131,7 +131,7 @@ esphome/components/i2s_audio/* @jesserockz
 esphome/components/i2s_audio/media_player/* @jesserockz
 esphome/components/i2s_audio/microphone/* @jesserockz
 esphome/components/i2s_audio/speaker/* @jesserockz
-esphome/components/ili9xxx/* @nielsnl68
+esphome/components/ili9xxx/* @clydebarrow @nielsnl68
 esphome/components/improv_base/* @esphome/core
 esphome/components/improv_serial/* @esphome/core
 esphome/components/ina260/* @mreditor97
diff --git a/esphome/components/ili9xxx/display.py b/esphome/components/ili9xxx/display.py
index 0435460b6a..89a6b2d1b9 100644
--- a/esphome/components/ili9xxx/display.py
+++ b/esphome/components/ili9xxx/display.py
@@ -25,7 +25,7 @@ def AUTO_LOAD():
     return []
 
 
-CODEOWNERS = ["@nielsnl68"]
+CODEOWNERS = ["@nielsnl68", "@clydebarrow"]
 
 ili9XXX_ns = cg.esphome_ns.namespace("ili9xxx")
 ili9XXXSPI = ili9XXX_ns.class_(
@@ -42,6 +42,7 @@ MODELS = {
     "ILI9341": ili9XXX_ns.class_("ILI9XXXILI9341", ili9XXXSPI),
     "ILI9342": ili9XXX_ns.class_("ILI9XXXILI9342", ili9XXXSPI),
     "ILI9481": ili9XXX_ns.class_("ILI9XXXILI9481", ili9XXXSPI),
+    "ILI9481-18": ili9XXX_ns.class_("ILI9XXXILI948118", ili9XXXSPI),
     "ILI9486": ili9XXX_ns.class_("ILI9XXXILI9486", ili9XXXSPI),
     "ILI9488": ili9XXX_ns.class_("ILI9XXXILI9488", ili9XXXSPI),
     "ILI9488_A": ili9XXX_ns.class_("ILI9XXXILI9488A", ili9XXXSPI),
@@ -140,8 +141,6 @@ async def to_code(config):
         rhs = []
         for x in range(256):
             rhs.extend([HexInt(x), HexInt(x), HexInt(x)])
-        prog_arr = cg.progmem_array(config[CONF_RAW_DATA_ID], rhs)
-        cg.add(var.set_palette(prog_arr))
     elif config[CONF_COLOR_PALETTE] == "IMAGE_ADAPTIVE":
         cg.add(var.set_buffer_color_mode(ILI9XXXColorMode.BITS_8_INDEXED))
         from PIL import Image
@@ -178,6 +177,4 @@ async def to_code(config):
     if rhs is not None:
         prog_arr = cg.progmem_array(config[CONF_RAW_DATA_ID], rhs)
         cg.add(var.set_palette(prog_arr))
-
-    spi_data_rate = str(spi.SPI_DATA_RATE_OPTIONS[config[CONF_DATA_RATE]])
-    cg.add_define("ILI9XXXDisplay_DATA_RATE", cg.RawExpression(spi_data_rate))
+    cg.add(var.set_data_rate(config[CONF_DATA_RATE]))
diff --git a/esphome/components/ili9xxx/ili9xxx_display.cpp b/esphome/components/ili9xxx/ili9xxx_display.cpp
index 750f629db2..abe01ea8c3 100644
--- a/esphome/components/ili9xxx/ili9xxx_display.cpp
+++ b/esphome/components/ili9xxx/ili9xxx_display.cpp
@@ -59,6 +59,7 @@ void ILI9XXXDisplay::dump_config() {
   if (this->is_18bitdisplay_) {
     ESP_LOGCONFIG(TAG, "  18-Bit Mode: YES");
   }
+  ESP_LOGCONFIG(TAG, "  Data rate: %dMHz", (unsigned) (this->data_rate_ / 1000000));
 
   LOG_PIN("  Reset Pin: ", this->reset_pin_);
   LOG_PIN("  DC Pin: ", this->dc_pin_);
@@ -387,6 +388,17 @@ void ILI9XXXILI9481::initialize() {
   }
 }
 
+void ILI9XXXILI948118::initialize() {
+  this->init_lcd_(INITCMD_ILI9481_18);
+  if (this->width_ == 0) {
+    this->width_ = 320;
+  }
+  if (this->height_ == 0) {
+    this->height_ = 480;
+  }
+  this->is_18bitdisplay_ = true;
+}
+
 //   35_TFT display
 void ILI9XXXILI9486::initialize() {
   this->init_lcd_(INITCMD_ILI9486);
diff --git a/esphome/components/ili9xxx/ili9xxx_display.h b/esphome/components/ili9xxx/ili9xxx_display.h
index 15b08e6c76..4e8355b9a5 100644
--- a/esphome/components/ili9xxx/ili9xxx_display.h
+++ b/esphome/components/ili9xxx/ili9xxx_display.h
@@ -120,6 +120,12 @@ class ILI9XXXILI9481 : public ILI9XXXDisplay {
   void initialize() override;
 };
 
+//-----------   ILI9481 in 18 bit mode --------------
+class ILI9XXXILI948118 : public ILI9XXXDisplay {
+ protected:
+  void initialize() override;
+};
+
 //-----------   ILI9XXX_35_TFT rotated display --------------
 class ILI9XXXILI9486 : public ILI9XXXDisplay {
  protected:
diff --git a/esphome/components/ili9xxx/ili9xxx_init.h b/esphome/components/ili9xxx/ili9xxx_init.h
index 1856fb06ab..031dc25f91 100644
--- a/esphome/components/ili9xxx/ili9xxx_init.h
+++ b/esphome/components/ili9xxx/ili9xxx_init.h
@@ -94,12 +94,36 @@ static const uint8_t PROGMEM INITCMD_ILI9481[] = {
   ILI9XXX_IFCTR  , 1, 0x83,
   ILI9XXX_GMCTR  ,12, 0x00, 0x26, 0x21, 0x00, 0x00, 0x1F, 0x65, 0x23, 0x77, 0x00, 0x0F, 0x00,
   ILI9XXX_IFMODE , 1, 0x00,  // CommandAccessProtect
+  ILI9XXX_PTLAR , 4, 0, 0, 1, 0xDF,
   0xE4        , 1, 0xA0,
+  ILI9XXX_MADCTL  , 1, MADCTL_MV | MADCTL_BGR,       // Memory Access Control
   ILI9XXX_CSCON , 1, 0x01,
+  ILI9XXX_PIXFMT, 1, 0x55,  // 16 bit mode
+  ILI9XXX_INVON, 0,
   ILI9XXX_DISPON, 0x80,     // Set display on
   0x00 // end
 };
 
+static const uint8_t PROGMEM INITCMD_ILI9481_18[] = {
+    ILI9XXX_SLPOUT ,  0x80,    // Exit sleep mode
+    ILI9XXX_PWSET  , 3, 0x07, 0x41, 0x1D,
+    ILI9XXX_VMCTR  , 3, 0x00, 0x1C, 0x1F,
+    ILI9XXX_PWSETN , 2, 0x01, 0x11,
+    ILI9XXX_PWCTR1 , 5, 0x10, 0x3B, 0x00, 0x02, 0x11,
+    ILI9XXX_VMCTR1 , 1, 0x03,
+    ILI9XXX_IFCTR  , 1, 0x83,
+    ILI9XXX_GMCTR  ,12, 0x00, 0x26, 0x21, 0x00, 0x00, 0x1F, 0x65, 0x23, 0x77, 0x00, 0x0F, 0x00,
+    ILI9XXX_IFMODE , 1, 0x00,  // CommandAccessProtect
+    ILI9XXX_PTLAR , 4, 0, 0, 1, 0xDF,
+    0xE4        , 1, 0xA0,
+    ILI9XXX_MADCTL  , 1, MADCTL_MX| MADCTL_BGR,       // Memory Access Control
+    ILI9XXX_CSCON , 1, 0x01,
+    ILI9XXX_PIXFMT, 1, 0x66,  // 18 bit mode
+    ILI9XXX_INVON, 0,
+    ILI9XXX_DISPON, 0x80,     // Set display on
+    0x00 // end
+};
+
 static const uint8_t PROGMEM INITCMD_ILI9486[] = {
   ILI9XXX_SLPOUT, 0x80,
   ILI9XXX_PIXFMT, 1, 0x55,
diff --git a/esphome/components/libretiny/__init__.py b/esphome/components/libretiny/__init__.py
index 3c1c0ac3f0..b01d342a87 100644
--- a/esphome/components/libretiny/__init__.py
+++ b/esphome/components/libretiny/__init__.py
@@ -170,7 +170,7 @@ def _notify_old_style(config):
 ARDUINO_VERSIONS = {
     "dev": (cv.Version(0, 0, 0), "https://github.com/libretiny-eu/libretiny.git"),
     "latest": (cv.Version(0, 0, 0), None),
-    "recommended": (cv.Version(1, 4, 0), None),
+    "recommended": (cv.Version(1, 4, 1), None),
 }
 
 
diff --git a/esphome/components/mqtt/__init__.py b/esphome/components/mqtt/__init__.py
index 9df2067832..10ae8ac40d 100644
--- a/esphome/components/mqtt/__init__.py
+++ b/esphome/components/mqtt/__init__.py
@@ -250,7 +250,7 @@ CONFIG_SCHEMA = cv.All(
         }
     ),
     validate_config,
-    cv.only_on(["esp32", "esp8266"]),
+    cv.only_on(["esp32", "esp8266", "bk72xx"]),
 )
 
 
@@ -271,10 +271,10 @@ def exp_mqtt_message(config):
 async def to_code(config):
     var = cg.new_Pvariable(config[CONF_ID])
     await cg.register_component(var, config)
-    # Add required libraries for ESP8266
-    if CORE.is_esp8266:
+    # Add required libraries for ESP8266 and LibreTiny
+    if CORE.is_esp8266 or CORE.is_libretiny:
         # https://github.com/heman/async-mqtt-client/blob/master/library.json
-        cg.add_library("heman/AsyncMqttClient-esphome", "1.0.0")
+        cg.add_library("heman/AsyncMqttClient-esphome", "2.0.0")
 
     cg.add_define("USE_MQTT")
     cg.add_global(mqtt_ns.using)
diff --git a/esphome/components/mqtt/mqtt_backend_libretiny.h b/esphome/components/mqtt/mqtt_backend_libretiny.h
new file mode 100644
index 0000000000..5373a1926a
--- /dev/null
+++ b/esphome/components/mqtt/mqtt_backend_libretiny.h
@@ -0,0 +1,74 @@
+#pragma once
+
+#ifdef USE_LIBRETINY
+
+#include "mqtt_backend.h"
+#include <AsyncMqttClient.h>
+
+namespace esphome {
+namespace mqtt {
+
+class MQTTBackendLibreTiny final : public MQTTBackend {
+ public:
+  void set_keep_alive(uint16_t keep_alive) final { mqtt_client_.setKeepAlive(keep_alive); }
+  void set_client_id(const char *client_id) final { mqtt_client_.setClientId(client_id); }
+  void set_clean_session(bool clean_session) final { mqtt_client_.setCleanSession(clean_session); }
+  void set_credentials(const char *username, const char *password) final {
+    mqtt_client_.setCredentials(username, password);
+  }
+  void set_will(const char *topic, uint8_t qos, bool retain, const char *payload) final {
+    mqtt_client_.setWill(topic, qos, retain, payload);
+  }
+  void set_server(network::IPAddress ip, uint16_t port) final {
+    mqtt_client_.setServer(IPAddress(static_cast<uint32_t>(ip)), port);
+  }
+  void set_server(const char *host, uint16_t port) final { mqtt_client_.setServer(host, port); }
+#if ASYNC_TCP_SSL_ENABLED
+  void set_secure(bool secure) { mqtt_client.setSecure(secure); }
+  void add_server_fingerprint(const uint8_t *fingerprint) { mqtt_client.addServerFingerprint(fingerprint); }
+#endif
+
+  void set_on_connect(std::function<on_connect_callback_t> &&callback) final {
+    this->mqtt_client_.onConnect(std::move(callback));
+  }
+  void set_on_disconnect(std::function<on_disconnect_callback_t> &&callback) final {
+    auto async_callback = [callback](AsyncMqttClientDisconnectReason reason) {
+      // int based enum so casting isn't a problem
+      callback(static_cast<MQTTClientDisconnectReason>(reason));
+    };
+    this->mqtt_client_.onDisconnect(std::move(async_callback));
+  }
+  void set_on_subscribe(std::function<on_subscribe_callback_t> &&callback) final {
+    this->mqtt_client_.onSubscribe(std::move(callback));
+  }
+  void set_on_unsubscribe(std::function<on_unsubscribe_callback_t> &&callback) final {
+    this->mqtt_client_.onUnsubscribe(std::move(callback));
+  }
+  void set_on_message(std::function<on_message_callback_t> &&callback) final {
+    auto async_callback = [callback](const char *topic, const char *payload,
+                                     AsyncMqttClientMessageProperties async_properties, size_t len, size_t index,
+                                     size_t total) { callback(topic, payload, len, index, total); };
+    mqtt_client_.onMessage(std::move(async_callback));
+  }
+  void set_on_publish(std::function<on_publish_user_callback_t> &&callback) final {
+    this->mqtt_client_.onPublish(std::move(callback));
+  }
+
+  bool connected() const final { return mqtt_client_.connected(); }
+  void connect() final { mqtt_client_.connect(); }
+  void disconnect() final { mqtt_client_.disconnect(true); }
+  bool subscribe(const char *topic, uint8_t qos) final { return mqtt_client_.subscribe(topic, qos) != 0; }
+  bool unsubscribe(const char *topic) final { return mqtt_client_.unsubscribe(topic) != 0; }
+  bool publish(const char *topic, const char *payload, size_t length, uint8_t qos, bool retain) final {
+    return mqtt_client_.publish(topic, qos, retain, payload, length, false, 0) != 0;
+  }
+  using MQTTBackend::publish;
+
+ protected:
+  AsyncMqttClient mqtt_client_;
+};
+
+}  // namespace mqtt
+}  // namespace esphome
+
+#endif  // defined(USE_LIBRETINY)
diff --git a/esphome/components/mqtt/mqtt_client.cpp b/esphome/components/mqtt/mqtt_client.cpp
index 0c6da42328..fd5e13ecc7 100644
--- a/esphome/components/mqtt/mqtt_client.cpp
+++ b/esphome/components/mqtt/mqtt_client.cpp
@@ -106,6 +106,9 @@ void MQTTClientComponent::send_device_info_() {
 #ifdef USE_ESP32
         root["platform"] = "ESP32";
 #endif
+#ifdef USE_LIBRETINY
+        root["platform"] = lt_cpu_get_model_name();
+#endif
 
         root["board"] = ESPHOME_BOARD;
 #if defined(USE_WIFI)
@@ -156,7 +159,7 @@ void MQTTClientComponent::start_dnslookup_() {
   this->dns_resolve_error_ = false;
   this->dns_resolved_ = false;
   ip_addr_t addr;
-#ifdef USE_ESP32
+#if defined(USE_ESP32) || defined(USE_LIBRETINY)
   err_t err = dns_gethostbyname_addrtype(this->credentials_.address.c_str(), &addr,
                                          MQTTClientComponent::dns_found_callback, this, LWIP_DNS_ADDRTYPE_IPV4);
 #endif
diff --git a/esphome/components/mqtt/mqtt_client.h b/esphome/components/mqtt/mqtt_client.h
index 00eb3fdd40..bcb44ab4c2 100644
--- a/esphome/components/mqtt/mqtt_client.h
+++ b/esphome/components/mqtt/mqtt_client.h
@@ -13,6 +13,8 @@
 #include "mqtt_backend_esp32.h"
 #elif defined(USE_ESP8266)
 #include "mqtt_backend_esp8266.h"
+#elif defined(USE_LIBRETINY)
+#include "mqtt_backend_libretiny.h"
 #endif
 #include "lwip/ip_addr.h"
 
@@ -300,6 +302,8 @@ class MQTTClientComponent : public Component {
   MQTTBackendESP32 mqtt_backend_;
 #elif defined(USE_ESP8266)
   MQTTBackendESP8266 mqtt_backend_;
+#elif defined(USE_LIBRETINY)
+  MQTTBackendLibreTiny mqtt_backend_;
 #endif
 
   MQTTClientState state_{MQTT_CLIENT_DISCONNECTED};
diff --git a/esphome/components/wireguard/__init__.py b/esphome/components/wireguard/__init__.py
index 717fe50d2c..acb5f690ec 100644
--- a/esphome/components/wireguard/__init__.py
+++ b/esphome/components/wireguard/__init__.py
@@ -9,6 +9,7 @@ from esphome.const import (
     CONF_REBOOT_TIMEOUT,
 )
 from esphome.components import time
+from esphome.core import TimePeriod
 
 CONF_NETMASK = "netmask"
 CONF_PRIVATE_KEY = "private_key"
@@ -59,9 +60,9 @@ CONFIG_SCHEMA = cv.Schema(
         cv.Optional(CONF_PEER_ALLOWED_IPS, default=["0.0.0.0/0"]): cv.ensure_list(
             _cidr_network
         ),
-        cv.Optional(CONF_PEER_PERSISTENT_KEEPALIVE, default=0): cv.Any(
+        cv.Optional(CONF_PEER_PERSISTENT_KEEPALIVE, default="0s"): cv.All(
             cv.positive_time_period_seconds,
-            cv.uint16_t,
+            cv.Range(max=TimePeriod(seconds=65535)),
         ),
         cv.Optional(
             CONF_REBOOT_TIMEOUT, default="15min"
diff --git a/esphome/const.py b/esphome/const.py
index f5319adfa7..c5cc7010a9 100644
--- a/esphome/const.py
+++ b/esphome/const.py
@@ -1,6 +1,6 @@
 """Constants used by esphome."""
 
-__version__ = "2023.9.0b3"
+__version__ = "2023.9.0b4"
 
 ALLOWED_NAME_CHARS = "abcdefghijklmnopqrstuvwxyz0123456789-_"
 VALID_SUBSTITUTIONS_CHARACTERS = (
diff --git a/tests/test1.yaml b/tests/test1.yaml
index fe983cf421..350057e3cc 100644
--- a/tests/test1.yaml
+++ b/tests/test1.yaml
@@ -2972,6 +2972,7 @@ display:
     model: TFT 2.4
     cs_pin: GPIO5
     dc_pin: GPIO4
+    color_palette: GRAYSCALE
     reset_pin: GPIO22
     lambda: |-
       it.rectangle(0, 0, it.get_width(), it.get_height());