diff --git a/main.lua b/main.lua
index 8a063d4..a658695 100644
--- a/main.lua
+++ b/main.lua
@@ -1,8 +1,13 @@
 -- main.lua - Entry point for ACTelemetry CSP Lua app
 -- CSP calls script.update(dt) every frame; we delegate to the telemetry module.
+-- CSP calls script.windowMain(dt) to draw the app window.
 
 local telemetry = require("src.telemetry")
 
 function script.update(dt)
     telemetry.update(dt)
 end
+
+function script.windowMain(dt)
+    ui.text("AC Telemetry ●")
+end
diff --git a/manifest.ini b/manifest.ini
index bfbc31f..679f955 100644
--- a/manifest.ini
+++ b/manifest.ini
@@ -6,6 +6,18 @@ Name = ACTelemetry
 Author = jan
 Version = 1.0.0
 Description = Sends car telemetry data as JSON over UDP for external dashboards and analysis tools.
+REQUIRED_VERSION = 0
 
-[SCRIPT]
-Script = main.lua
+[CORE]
+LAZY = NONE
+
+[WINDOW_...]
+ID = main
+NAME = AC Telemetry
+ICON = icon.png
+FUNCTION_MAIN = windowMain
+FLAGS = NO_SCROLLBAR,NO_SCROLL_WITH_MOUSE,NO_BACKGROUND,NO_TITLE_BAR,FADING,FLOATING_TITLE_BAR
+SIZE = 160, 30
+MIN_SIZE = 160, 30
+PADDING = 0
+VISIBLE = 1
diff --git a/src/telemetry.lua b/src/telemetry.lua
index 2056e74..ff986dd 100644
--- a/src/telemetry.lua
+++ b/src/telemetry.lua
@@ -6,13 +6,32 @@ local json = require("src.json")
 
 local telemetry = {}
 
-local socket = require("socket.udp")
-local udp = socket()
+local ac_available = type(ac) == "table" and type(ac.getCarState) == "function"
+
+if ac_available then
+    ac.log("[ACTelemetry] Before require('socket')")
+else
+    print("[ACTelemetry] Before require('socket')")
+end
+
+local socket = require("socket")
+
+if ac_available then
+    ac.log("[ACTelemetry] require('socket') succeeded, type = " .. type(socket))
+else
+    print("[ACTelemetry] require('socket') succeeded, type = " .. type(socket))
+end
+
+local udp = socket.udp()
+
+if ac_available then
+    ac.log("[ACTelemetry] socket.udp() succeeded, type = " .. type(udp))
+else
+    print("[ACTelemetry] socket.udp() succeeded, type = " .. type(udp))
+end
 
 local last_send_time = 0
 
-local ac_available = type(ac) == "table" and type(ac.getCarState) == "function"
-
 local buf_g_forces = { x = 0, y = 0, z = 0 }
 local buf_wheel_slip = { 0, 0, 0, 0 }
 local buf_suspension_travel = { 0, 0, 0, 0 }