key_extendr clened up and readme updated

Makefile

@@ -33,6 +33,7 @@ exec:
 
 stop:
 	-@sshpass -p "$(PASSWD)" ssh "$(TARGET)" 'for i in {0..25}; do P4wnP1_cli hid job cancel $$i; done' > /dev/null 2>&1 || true 
+	-@pkill key_extendr 
 	@echo "[i] Stopped all running jobs"
 
 ## Sync and execute

key_extendr/key_extendr.py

@@ -3,16 +3,11 @@ import evdev
 import uinput
 import time
 import threading
-import os, signal
+import os, signal, sys
 
 HOLD_DURATION = 0.1  # 100ms
 DEV_NAME_FRAG = "just an usb stick"
 
-
-# root only needed without input group and udev rules!!
-#if os.geteuid() != 0:
-#    raise SystemExit("Error: run as root (sudo)")
-
 def find_device(name_fragment, exclude="Mouse"):
     for path in evdev.list_devices():
         dev = evdev.InputDevice(path)
@@ -24,43 +19,55 @@ def find_device(name_fragment, exclude="Mouse"):
     raise RuntimeError(f"No device matching '{name_fragment}' found")
 
 def hold_key(key, dev):
-    dev.emit((evdev.ecodes.EV_KEY, key), 1)  # key down
-    time.sleep(HOLD_DURATION)
-    dev.emit((evdev.ecodes.EV_KEY, key), 0)  # key up
+    try:
+        dev.emit((evdev.ecodes.EV_KEY, key), 1)
+        time.sleep(HOLD_DURATION)
+        dev.emit((evdev.ecodes.EV_KEY, key), 0)
+    except OSError as e:
+        print(f"[ERROR] emit failed for key {key}: {e}", file=sys.stderr)
 
 def handle_exit(sig, frame):
     print("\nExiting...")
     raise SystemExit(0)
 
+try:
+    keyboard = uinput.Device([
+        uinput.KEY_UP,
+        uinput.KEY_DOWN,
+        uinput.KEY_LEFT,
+        uinput.KEY_RIGHT,
+        uinput.KEY_ENTER,
+        uinput.KEY_X,
+        uinput.KEY_Z,
+        uinput.KEY_A,
+        uinput.KEY_S,
+        uinput.KEY_TAB,
+        uinput.KEY_BACKSPACE,
+    ])
+except OSError as e:
+    print(f"[ERROR] Failed to open uinput device: {e}", file=sys.stderr)
+    sys.exit(1)
 
-keyboard = uinput.Device([
-    uinput.KEY_UP,
-    uinput.KEY_DOWN,
-    uinput.KEY_LEFT,
-    uinput.KEY_RIGHT,
-    uinput.KEY_ENTER,
-    uinput.KEY_X,
-    uinput.KEY_Z,
-    uinput.KEY_A,
-    uinput.KEY_S,
-    uinput.KEY_TAB,
-    uinput.KEY_BACKSPACE,
-])
-source = find_device(DEV_NAME_FRAG)
+try:
+    source = find_device(DEV_NAME_FRAG)
+except RuntimeError as e:
+    print(f"[ERROR] {e}", file=sys.stderr)
+    sys.exit(1)
 
 signal.signal(signal.SIGINT, handle_exit)
 signal.signal(signal.SIGTERM, handle_exit)
 
 print(f"Listening on '{source.name}' ...")
 
-for event in source.read_loop():
-    if event.type == evdev.ecodes.EV_KEY:
-        if event.value == 1:  # key down only
-            threading.Thread(
-                target=hold_key, 
-                args=(
-                    event.code,
-                    keyboard
-                ), 
-                daemon=True
-            ).start()
+try:
+    for event in source.read_loop():
+        if event.type == evdev.ecodes.EV_KEY:
+            if event.value == 1:
+                threading.Thread(
+                    target=hold_key,
+                    args=(event.code, keyboard),
+                    daemon=True
+                ).start()
+except OSError as e:
+    print(f"[ERROR] Device read error (disconnected?): {e}", file=sys.stderr)
+    sys.exit(1)