diff --git a/app/Kconfig b/app/Kconfig
new file mode 100644
index 00000000..2dcab7b9
--- /dev/null
+++ b/app/Kconfig
@@ -0,0 +1,81 @@
+menu "Zephyr"
+source "Kconfig.zephyr"
+endmenu
+
+menuconfig LED_SUBSYSTEM
+    bool "LED Subsystem"
+    default y
+
+if LED_SUBSYSTEM
+
+config APP_HEARTBEAT_PERIOD_MS
+    int "Period (in milliseconds) of the heartbeat LED"
+    default 500
+    range 100 2000
+
+choice
+    prompt "LED blinking sleep time"
+    default BLINKING_SPEED_MEDIUM
+
+config BLINKING_SPEED_SLOW
+    bool "2s (slow)"
+
+config BLINKING_SPEED_MEDIUM
+    bool "1s (medium)"
+
+config BLINKING_SPEED_FAST
+    bool "500ms (fast)"
+
+config BLINKING_LUDICROUS_SPEED
+    bool "250ms (ludicrous)"
+
+endchoice
+
+config LED_BLINK_PERIOD_MS
+    int
+    default 2000 if BLINKING_SPEED_SLOW
+    default 1000 if BLINKING_SPEED_MEDIUM
+    default 500 if BLINKING_SPEED_FAST
+    default 250 if BLINKING_LUDICROUS_SPEED
+    default 0
+
+menuconfig ADVANCED_LED_SETTINGS
+    bool "Advanced LED settings"
+    default n
+
+if ADVANCED_LED_SETTINGS
+
+config LED_BRIGHTNESS
+    int "LED brightness (0-100)"
+    default 100
+    range 0 100
+    help
+        Brightness power in percentage (0 is off, 100 is full power).
+
+config LED_FADE_DURATION
+    int "LED fade duration (ms)"
+    default 500
+    range 0 5000
+    help
+        Duration of the fade effect in milliseconds.
+
+menu "Expert settings"
+    visible if GPIO
+
+config LED_DEBUGGING
+    bool "Enable LED debugging"
+    default n
+    help
+        Enable LED debugging.
+
+config CUSTOM_BLINK_PATTERN
+    bool "Custom blink pattern"
+    default n
+    help
+        Use a custom blink pattern.
+
+endmenu
+
+endif # ADVANCED_LED_SETTINGS
+
+endif # LED_SUBSYSTEM
diff --git a/app/app.overlay b/app/app.overlay
new file mode 100644
index 00000000..f69df84d
--- /dev/null
+++ b/app/app.overlay
@@ -0,0 +1,14 @@
+/ {
+    aliases {
+        app-led = &led0;
+    };
+
+    leds {
+        compatible = "gpio-leds";
+
+        led0: ext_led {
+            gpios = <&gpio0 17 GPIO_ACTIVE_LOW>;
+            label = "External LED";
+        };
+    };
+};
diff --git a/app/prj.conf b/app/prj.conf
index 244cc784..d54ba502 100644
--- a/app/prj.conf
+++ b/app/prj.conf
@@ -1,2 +1,3 @@
+CONFIG_CPP=y
 CONFIG_GPIO=y
 CONFIG_LOG=y
diff --git a/app/src/main.cpp b/app/src/main.cpp
index 5dfdde9c..5d918ae9 100644
--- a/app/src/main.cpp
+++ b/app/src/main.cpp
@@ -1,30 +1,34 @@
-#include <zephyr/drivers/gpio.h>
 #include <zephyr/kernel.h>
+#include <zephyr/drivers/gpio.h>
 #include <zephyr/logging/log.h>
 
-#define SLEEP_TIME_MS 1000
-
-/* The devicetree node identifier for the "led0" alias. */
-#define LED_NODE DT_ALIAS(led0)
+LOG_MODULE_REGISTER(main, LOG_LEVEL_INF);
 
+#define LED_NODE DT_ALIAS(app_led)
 static const struct gpio_dt_spec led = GPIO_DT_SPEC_GET(LED_NODE, gpios);
 
-LOG_MODULE_REGISTER(main, LOG_LEVEL_INF);
-
 int main(void)
 {
     bool led_state = true;
 
-    if (!gpio_is_ready_dt(&led)) return 0;
+    if (!gpio_is_ready_dt(&led)) {
+        LOG_ERR("LED not ready!");
+        return -1;
+    }
 
-    if (gpio_pin_configure_dt(&led, GPIO_OUTPUT_ACTIVE) < 0) return 0;
+    if (gpio_pin_configure_dt(&led, GPIO_OUTPUT_ACTIVE) < 0) {
+        LOG_ERR("Unable to configure LED!");
+        return -1;
+    }
 
     while (1) {
-        if (gpio_pin_toggle_dt(&led) < 0) return 0;
-
         led_state = !led_state;
+        if (gpio_pin_toggle_dt(&led) < 0) {
+            LOG_ERR("Unable to toggle the LED!");
+            return -1;
+        }
         LOG_INF("LED state: %s", led_state ? "ON" : "OFF");
-        k_msleep(SLEEP_TIME_MS);
+        k_msleep(CONFIG_APP_HEARTBEAT_PERIOD_MS);
     }
     return 0;
 }
diff --git a/west.yml b/west.yml
index 8b525769..db8df41e 100644
--- a/west.yml
+++ b/west.yml
@@ -4,11 +4,9 @@ manifest:
   projects:
     - name: zephyr
       url: https://github.com/zephyrproject-rtos/zephyr
-      revision: v4.2.0
+      revision: v4.4.0-rc1
       import:
         name-allowlist:
           - cmsis_6
-          - hal_nxp
-          - hal_stm32
-          - hal_nordic
+          - hal_espressif
         path-prefix: deps