diff --git a/ExternalApps/GraphicsDemo/.gitignore b/ExternalApps/GraphicsDemo/.gitignore
new file mode 100644
index 00000000..89baa26e
--- /dev/null
+++ b/ExternalApps/GraphicsDemo/.gitignore
@@ -0,0 +1,2 @@
+build*/
+.tactility/
diff --git a/ExternalApps/GraphicsDemo/CMakeLists.txt b/ExternalApps/GraphicsDemo/CMakeLists.txt
new file mode 100644
index 00000000..c9cfd749
--- /dev/null
+++ b/ExternalApps/GraphicsDemo/CMakeLists.txt
@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.20)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+
+if (DEFINED ENV{TACTILITY_SDK_PATH})
+    set(TACTILITY_SDK_PATH $ENV{TACTILITY_SDK_PATH})
+else()
+    set(TACTILITY_SDK_PATH "../../release/TactilitySDK")
+    message(WARNING "⚠️ TACTILITY_SDK_PATH environment variable is not set, defaulting to ${TACTILITY_SDK_PATH}")
+endif()
+
+include("${TACTILITY_SDK_PATH}/TactilitySDK.cmake")
+set(EXTRA_COMPONENT_DIRS ${TACTILITY_SDK_PATH})
+
+project(GraphicsDemo)
+tactility_project(GraphicsDemo)
diff --git a/ExternalApps/GraphicsDemo/main/CMakeLists.txt b/ExternalApps/GraphicsDemo/main/CMakeLists.txt
new file mode 100644
index 00000000..62c36897
--- /dev/null
+++ b/ExternalApps/GraphicsDemo/main/CMakeLists.txt
@@ -0,0 +1,6 @@
+file(GLOB_RECURSE SOURCE_FILES Source/*.c*)
+
+idf_component_register(
+    SRCS ${SOURCE_FILES}
+    REQUIRES TactilitySDK
+)
diff --git a/ExternalApps/GraphicsDemo/main/Source/main.cpp b/ExternalApps/GraphicsDemo/main/Source/main.cpp
new file mode 100644
index 00000000..0f505bf3
--- /dev/null
+++ b/ExternalApps/GraphicsDemo/main/Source/main.cpp
@@ -0,0 +1,83 @@
+#include "esp_log.h"
+
+#include <tt_app.h>
+#include <tt_hal_device.h>
+#include <tt_hal_display.h>
+#include <tt_kernel.h>
+#include <tt_lvgl.h>
+
+constexpr auto TAG = "GraphicsDemo";
+
+const LV_ATTRIBUTE_MEM_ALIGN LV_ATTRIBUTE_LARGE_CONST uint8_t logo[] = {
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x19, 0xf4, 0x38, 0xf4, 0x78, 0xf4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0xdf, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xbb, 0xa4, 0x18, 0xf4, 0x18, 0xf4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xbb, 0xa4, 0x18, 0xf4, 0x18, 0xf4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0x9a, 0xb4, 0x18, 0xf4, 0x18, 0xf4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0x00, 0x00, 0x00, 0x00, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0x00, 0x00, 0x00, 0x00, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x05, 0xff, 0x05, 0x9e, 0x45, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x05, 0xff, 0x05, 0x5d, 0x55, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x05, 0xff, 0x05, 0x5d, 0x55, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x18, 0xf4, 0x78, 0xf4,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0x05, 0xff, 0x05, 0xff, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0x06, 0xff, 0x05, 0xff, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+};
+
+static void onCreate(AppHandle appHandle, void* data) {
+    DeviceId deviceId = 0;
+    uint16_t count = 0;
+    if (!tt_hal_device_find(DEVICE_TYPE_DISPLAY, &deviceId, &count, 1)) {
+        ESP_LOGI(TAG, "No display device found");
+        tt_app_stop();
+        return;
+    }
+
+    if (!tt_hal_display_driver_supported(deviceId)) {
+        ESP_LOGI(TAG, "Display doesn't support driver interface");
+        tt_app_stop();
+        return;
+    }
+
+    tt_lvgl_stop();
+
+    auto* driver = tt_hal_display_driver_alloc(deviceId);
+    tt_hal_display_driver_draw_bitmap(driver, 0, 0, 24, 24, logo);
+    tt_hal_display_driver_free(driver);
+
+    tt_kernel_delay_millis(2000);
+
+    tt_app_stop();
+}
+
+static void onDestroy(AppHandle appHandle, void* data) {
+    if (!tt_lvgl_is_started()) {
+        tt_lvgl_start();
+    }
+}
+
+ExternalAppManifest manifest = {
+    .name = "Hello World",
+    .onCreate = onCreate,
+    .onDestroy = onDestroy
+};
+
+extern "C" {
+
+int main(int argc, char* argv[]) {
+    tt_app_register(&manifest);
+    return 0;
+}
+
+}
diff --git a/ExternalApps/GraphicsDemo/tactility.properties b/ExternalApps/GraphicsDemo/tactility.properties
new file mode 100644
index 00000000..aa5aa4a2
--- /dev/null
+++ b/ExternalApps/GraphicsDemo/tactility.properties
@@ -0,0 +1,2 @@
+[sdk]
+version = 0.4.0
diff --git a/ExternalApps/GraphicsDemo/tactility.py b/ExternalApps/GraphicsDemo/tactility.py
new file mode 100644
index 00000000..a1ede4ea
--- /dev/null
+++ b/ExternalApps/GraphicsDemo/tactility.py
@@ -0,0 +1,478 @@
+import configparser
+import json
+import os
+import re
+import shutil
+import sys
+import subprocess
+import time
+import urllib.request
+import zipfile
+
+import requests
+
+# Targetable platforms that represent a specific hardware target
+platform_targets = ["esp32", "esp32s3"]
+# All valid platform commandline arguments
+platform_arguments = platform_targets.copy()
+platform_arguments.append("all")
+ttbuild_path = ".tactility"
+ttbuild_version = "1.2.1"
+ttbuild_properties_file = "tactility.properties"
+ttbuild_cdn = "https://cdn.tactility.one"
+ttbuild_sdk_json_validity = 3600  # seconds
+ttport = 6666
+verbose = False
+use_local_sdk = False
+
+spinner_pattern = [
+    "⠋",
+    "⠙",
+    "⠹",
+    "⠸",
+    "⠼",
+    "⠴",
+    "⠦",
+    "⠧",
+    "⠇",
+    "⠏"
+]
+
+if sys.platform == "win32":
+    shell_color_red = ""
+    shell_color_orange = ""
+    shell_color_green = ""
+    shell_color_purple = ""
+    shell_color_cyan = ""
+    shell_color_reset = ""
+else:
+    shell_color_red = "\033[91m"
+    shell_color_orange = "\033[93m"
+    shell_color_green = "\033[32m"
+    shell_color_purple = "\033[35m"
+    shell_color_cyan = "\033[36m"
+    shell_color_reset = "\033[m"
+
+def print_help():
+    print("Usage: python tactility.py [action] [options]")
+    print("")
+    print("Actions:")
+    print("  build [esp32,esp32s3,all,local]          Build the app for the specified platform")
+    print("    esp32:         ESP32")
+    print("    esp32s3:       ESP32 S3")
+    print("    all:           all supported ESP platforms")
+    print("  clean                                    Clean the build folders")
+    print("  clearcache                               Clear the SDK cache")
+    print("  updateself                               Update this tool")
+    print("  run [ip] [app id]                        Run an application")
+    print("  install [ip] [esp32,esp32s3]             Install an application")
+    print("")
+    print("Options:")
+    print("  --help                                   Show this commandline info")
+    print("  --local-sdk                              Use SDK specified by environment variable TACTILITY_SDK_PATH")
+    print("  --skip-build                             Run everything except the idf.py/CMake commands")
+    print("  --verbose                                Show extra console output")
+
+def download_file(url, filepath):
+    global verbose
+    if verbose:
+        print(f"Downloading from {url} to {filepath}")
+    request = urllib.request.Request(
+        url,
+        data=None,
+        headers={
+            "User-Agent": f"Tactility Build Tool {ttbuild_version}"
+        }
+    )
+    try:
+        response = urllib.request.urlopen(request)
+        file = open(filepath, mode="wb")
+        file.write(response.read())
+        file.close()
+        return True
+    except OSError as error:
+        if verbose:
+            print_error(f"Failed to fetch URL {url}\n{error}")
+        return False
+
+def print_warning(message):
+    print(f"{shell_color_orange}WARNING: {message}{shell_color_reset}")
+
+def print_error(message):
+    print(f"{shell_color_red}ERROR: {message}{shell_color_reset}")
+
+def exit_with_error(message):
+    print_error(message)
+    sys.exit(1)
+
+def get_url(ip, path):
+    return f"http://{ip}:{ttport}{path}"
+
+def is_valid_platform_name(name):
+    global platform_arguments
+    return name in platform_arguments
+
+def validate_environment():
+    global ttbuild_properties_file, use_local_sdk
+    if os.environ.get("IDF_PATH") is None:
+        exit_with_error("Cannot find the Espressif IDF SDK. Ensure it is installed and that it is activated via $PATH_TO_IDF_SDK/export.sh")
+    if not os.path.exists(ttbuild_properties_file):
+        exit_with_error(f"{ttbuild_properties_file} file not found")
+    if use_local_sdk == False and os.environ.get("TACTILITY_SDK_PATH") is not None:
+        print_warning("TACTILITY_SDK_PATH is set, but will be ignored by this command.")
+        print_warning("If you want to use it, use the 'build local' parameters.")
+    elif use_local_sdk == True and os.environ.get("TACTILITY_SDK_PATH") is None:
+        exit_with_error("local build was requested, but TACTILITY_SDK_PATH environment variable is not set.")
+
+def setup_environment():
+    global ttbuild_path
+    os.makedirs(ttbuild_path, exist_ok=True)
+
+def get_sdk_dir(version, platform):
+    global use_local_sdk
+    if use_local_sdk:
+        return os.environ.get("TACTILITY_SDK_PATH")
+    else:
+        global ttbuild_cdn
+        return os.path.join(ttbuild_path, f"{version}-{platform}", "TactilitySDK")
+
+def get_sdk_version():
+    global ttbuild_properties_file
+    parser = configparser.RawConfigParser()
+    parser.read(ttbuild_properties_file)
+    sdk_dict = dict(parser.items("sdk"))
+    if not "version" in sdk_dict:
+        exit_with_error(f"Could not find 'version' in [sdk] section in {ttbuild_properties_file}")
+    return sdk_dict["version"]
+
+def get_sdk_root_dir(version, platform):
+    global ttbuild_cdn
+    return os.path.join(ttbuild_path, f"{version}-{platform}")
+
+def get_sdk_url(version, platform):
+    global ttbuild_cdn
+    return f"{ttbuild_cdn}/TactilitySDK-{version}-{platform}.zip"
+
+def sdk_exists(version, platform):
+    sdk_dir = get_sdk_dir(version, platform)
+    return os.path.isdir(sdk_dir)
+
+def should_update_sdk_json():
+    global ttbuild_cdn
+    json_filepath = os.path.join(ttbuild_path, "sdk.json")
+    if os.path.exists(json_filepath):
+        json_modification_time = os.path.getmtime(json_filepath)
+        now = time.time()
+        global ttbuild_sdk_json_validity
+        minimum_seconds_difference = ttbuild_sdk_json_validity
+        return (now - json_modification_time) > minimum_seconds_difference
+    else:
+        return True
+
+def update_sdk_json():
+    global ttbuild_cdn, ttbuild_path
+    json_url = f"{ttbuild_cdn}/sdk.json"
+    json_filepath = os.path.join(ttbuild_path, "sdk.json")
+    return download_file(json_url, json_filepath)
+
+def should_fetch_sdkconfig_files():
+    for platform in platform_targets:
+        sdkconfig_filename = f"sdkconfig.app.{platform}"
+        if not os.path.exists(os.path.join(ttbuild_path, sdkconfig_filename)):
+            return True
+    return False
+
+def fetch_sdkconfig_files():
+    for platform in platform_targets:
+        sdkconfig_filename = f"sdkconfig.app.{platform}"
+        target_path = os.path.join(ttbuild_path, sdkconfig_filename)
+        if not download_file(f"{ttbuild_cdn}/{sdkconfig_filename}", target_path):
+            exit_with_error(f"Failed to download sdkconfig file for {platform}")
+
+
+def validate_version_and_platforms(sdk_json, sdk_version, platforms_to_build):
+    version_map = sdk_json["versions"]
+    if not sdk_version in version_map:
+        exit_with_error(f"Version not found: {sdk_version}")
+    version_data = version_map[sdk_version]
+    available_platforms = version_data["platforms"]
+    for desired_platform in platforms_to_build:
+        if not desired_platform in available_platforms:
+            exit_with_error(f"Platform {desired_platform} is not available. Available ones: {available_platforms}")
+
+def validate_self(sdk_json):
+    if not "toolVersion" in sdk_json:
+        exit_with_error("Server returned invalid SDK data format (toolVersion not found)")
+    if not "toolCompatibility" in sdk_json:
+        exit_with_error("Server returned invalid SDK data format (toolCompatibility not found)")
+    if not "toolDownloadUrl" in sdk_json:
+        exit_with_error("Server returned invalid SDK data format (toolDownloadUrl not found)")
+    tool_version = sdk_json["toolVersion"]
+    tool_compatibility = sdk_json["toolCompatibility"]
+    if tool_version != ttbuild_version:
+        print_warning(f"New version available: {tool_version} (currently using {ttbuild_version})")
+        print_warning(f"Run 'tactility.py updateself' to update.")
+    if re.search(tool_compatibility, ttbuild_version) is None:
+        print_error("The tool is not compatible anymore.")
+        print_error("Run 'tactility.py updateself' to update.")
+        sys.exit(1)
+
+def sdk_download(version, platform):
+    sdk_root_dir = get_sdk_root_dir(version, platform)
+    os.makedirs(sdk_root_dir, exist_ok=True)
+    sdk_url = get_sdk_url(version, platform)
+    filepath = os.path.join(sdk_root_dir, f"{version}-{platform}.zip")
+    print(f"Downloading SDK version {version} for {platform}")
+    if download_file(sdk_url, filepath):
+        with zipfile.ZipFile(filepath, "r") as zip_ref:
+            zip_ref.extractall(os.path.join(sdk_root_dir, "TactilitySDK"))
+        return True
+    else:
+        return False
+
+def sdk_download_all(version, platforms):
+    for platform in platforms:
+        if not sdk_exists(version, platform):
+            if not sdk_download(version, platform):
+                return False
+        else:
+            if verbose:
+                print(f"Using cached download for SDK version {version} and platform {platform}")
+    return True
+
+def find_elf_file(platform):
+    build_dir = f"build-{platform}"
+    if os.path.exists(build_dir):
+        for file in os.listdir(build_dir):
+            if file.endswith(".app.elf"):
+                return os.path.join(build_dir, file)
+    return None
+
+def build_all(version, platforms, skip_build):
+    for platform in platforms:
+        # First build command must be "idf.py build", otherwise it fails to execute "idf.py elf"
+        # We check if the ELF file exists and run the correct command
+        # This can lead to code caching issues, so sometimes a clean build is required
+        if find_elf_file(platform) is None:
+            if not build_first(version, platform, skip_build):
+                break
+        else:
+            if not build_consecutively(version, platform, skip_build):
+                break
+
+def wait_for_build(process, platform):
+    buffer = []
+    os.set_blocking(process.stdout.fileno(), False)
+    while process.poll() is None:
+        for i in spinner_pattern:
+            time.sleep(0.1)
+            progress_text = f"Building for {platform} {shell_color_cyan}" + str(i) + shell_color_reset
+            sys.stdout.write(progress_text + "\r")
+            while True:
+                line = process.stdout.readline()
+                decoded_line = line.decode("UTF-8")
+                if decoded_line != "":
+                    buffer.append(decoded_line)
+                else:
+                    break
+    return buffer
+
+# The first build must call "idf.py build" and consecutive builds must call "idf.py elf" as it finishes faster.
+# The problem is that the "idf.py build" always results in an error, even though the elf file is created.
+# The solution is to suppress the error if we find that the elf file was created.
+def build_first(version, platform, skip_build):
+    sdk_dir = get_sdk_dir(version, platform)
+    if verbose:
+        print(f"Using SDK at {sdk_dir}")
+    os.environ["TACTILITY_SDK_PATH"] = sdk_dir
+    sdkconfig_path = os.path.join(ttbuild_path, f"sdkconfig.app.{platform}")
+    os.system(f"cp {sdkconfig_path} sdkconfig")
+    elf_path = find_elf_file(platform)
+    # Remove previous elf file: re-creation of the file is used to measure if the build succeeded,
+    # as the actual build job will always fail due to technical issues with the elf cmake script
+    if elf_path is not None:
+        os.remove(elf_path)
+    if skip_build:
+        return True
+    print("Building first build")
+    with subprocess.Popen(["idf.py", "-B", f"build-{platform}", "build"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT) as process:
+        build_output = wait_for_build(process, platform)
+        # The return code is never expected to be 0 due to a bug in the elf cmake script, but we keep it just in case
+        if process.returncode == 0:
+            print(f"{shell_color_green}Building for {platform} ✅{shell_color_reset}")
+            return True
+        else:
+            if find_elf_file(platform) is None:
+                for line in build_output:
+                    print(line, end="")
+                print(f"{shell_color_red}Building for {platform} failed ❌{shell_color_reset}")
+                return False
+            else:
+                print(f"{shell_color_green}Building for {platform} ✅{shell_color_reset}")
+                return True
+
+def build_consecutively(version, platform, skip_build):
+    sdk_dir = get_sdk_dir(version, platform)
+    if verbose:
+        print(f"Using SDK at {sdk_dir}")
+    os.environ["TACTILITY_SDK_PATH"] = sdk_dir
+    sdkconfig_path = os.path.join(ttbuild_path, f"sdkconfig.app.{platform}")
+    os.system(f"cp {sdkconfig_path} sdkconfig")
+    if skip_build:
+        return True
+    with subprocess.Popen(["idf.py", "-B", f"build-{platform}", "elf"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT) as process:
+        build_output = wait_for_build(process, platform)
+        if process.returncode == 0:
+            print(f"{shell_color_green}Building for {platform} ✅{shell_color_reset}")
+            return True
+        else:
+            for line in build_output:
+                print(line, end="")
+            print(f"{shell_color_red}Building for {platform} failed ❌{shell_color_reset}")
+            return False
+
+def read_sdk_json():
+    json_file_path = os.path.join(ttbuild_path, "sdk.json")
+    json_file = open(json_file_path)
+    return json.load(json_file)
+
+def build_action(platform_arg):
+    # Environment validation
+    validate_environment()
+    platforms_to_build = platform_targets if platform_arg == "all" else [platform_arg]
+    if not is_valid_platform_name(platform_arg):
+        print_help()
+        exit_with_error("Invalid platform name")
+    if not use_local_sdk:
+        if should_fetch_sdkconfig_files():
+            fetch_sdkconfig_files()
+        sdk_json = read_sdk_json()
+        validate_self(sdk_json)
+        if not "versions" in sdk_json:
+            exit_with_error("Version data not found in sdk.json")
+    # Build
+    sdk_version = get_sdk_version()
+    if not use_local_sdk:
+        validate_version_and_platforms(sdk_json, sdk_version, platforms_to_build)
+        if not sdk_download_all(sdk_version, platforms_to_build):
+            exit_with_error("Failed to download one or more SDKs")
+    build_all(sdk_version, platforms_to_build, skip_build)  # Environment validation
+
+def clean_action():
+    count = 0
+    for path in os.listdir("."):
+        if path.startswith("build-"):
+            print(f"Removing {path}/")
+            shutil.rmtree(path)
+            count = count + 1
+    if count == 0:
+        print("Nothing to clean")
+
+def clear_cache_action():
+    if os.path.exists(ttbuild_path):
+        print(f"Removing {ttbuild_path}/")
+        shutil.rmtree(ttbuild_path)
+    else:
+        print("Nothing to clear")
+
+def update_self_action():
+    sdk_json = read_sdk_json()
+    tool_download_url = sdk_json["toolDownloadUrl"]
+    if download_file(tool_download_url, "tactility.py"):
+        print("Updated")
+    else:
+        exit_with_error("Update failed")
+
+def get_device_info(ip):
+    print(f"Getting device info from {ip}")
+    url = get_url(ip, "/info")
+    try:
+        response = requests.get(url)
+        if response.status_code != 200:
+            print_error("Run failed")
+        else:
+            print(response.json())
+            print(f"{shell_color_green}Run successful ✅{shell_color_reset}")
+    except requests.RequestException as e:
+        print(f"Request failed: {e}")
+
+def run_action(ip, app_id):
+    print(f"Running {app_id} on {ip}")
+    url = get_url(ip, "/app/run")
+    params = {'id': app_id}
+    try:
+        response = requests.post(url, params=params)
+        if response.status_code != 200:
+            print_error("Run failed")
+        else:
+            print(f"{shell_color_green}Run successful ✅{shell_color_reset}")
+    except requests.RequestException as e:
+        print(f"Request failed: {e}")
+
+def install_action(ip, platform):
+    file_path = find_elf_file(platform)
+    if file_path is None:
+        print_error(f"File not found: {file_path}")
+        return
+    print(f"Installing {file_path} to {ip}")
+    url = get_url(ip, "/app/install")
+    try:
+        # Prepare multipart form data
+        with open(file_path, 'rb') as file:
+            files = {
+                'elf': file
+            }
+            response = requests.put(url, files=files)
+            if response.status_code != 200:
+                print_error("Install failed")
+            else:
+                print(f"{shell_color_green}Installation successful ✅{shell_color_reset}")
+    except requests.RequestException as e:
+        print_error(f"Installation failed: {e}")
+    except IOError as e:
+        print_error(f"File error: {e}")
+
+
+if __name__ == "__main__":
+    print(f"Tactility Build System v{ttbuild_version}")
+    if "--help" in sys.argv:
+        print_help()
+        sys.exit()
+    # Argument validation
+    if len(sys.argv) == 1:
+        print_help()
+        sys.exit()
+    action_arg = sys.argv[1]
+    verbose = "--verbose" in sys.argv
+    skip_build = "--skip-build" in sys.argv
+    use_local_sdk = "--local-sdk" in sys.argv
+    # Environment setup
+    setup_environment()
+    # Update SDK cache (sdk.json)
+    if should_update_sdk_json() and not update_sdk_json():
+        exit_with_error("Failed to retrieve SDK info")
+    # Actions
+    if action_arg == "build":
+        if len(sys.argv) < 3:
+            print_help()
+            exit_with_error("Commandline parameter missing")
+        build_action(sys.argv[2])
+    elif action_arg == "clean":
+        clean_action()
+    elif action_arg == "clearcache":
+        clear_cache_action()
+    elif action_arg == "updateself":
+        update_self_action()
+    elif action_arg == "run":
+        if len(sys.argv) < 4:
+            print_help()
+            exit_with_error("Commandline parameter missing")
+        run_action(sys.argv[2], sys.argv[3])
+    elif action_arg == "install":
+        if len(sys.argv) < 4:
+            print_help()
+            exit_with_error("Commandline parameter missing")
+        install_action(sys.argv[2], sys.argv[3])
+    else:
+        print_help()
+        exit_with_error("Unknown commandline parameter")