diff --git a/examples/knx-demo/platformio.ini b/examples/knx-demo/platformio.ini
index b5cdfe5..1924630 100644
--- a/examples/knx-demo/platformio.ini
+++ b/examples/knx-demo/platformio.ini
@@ -123,6 +123,8 @@ build_flags =
   -DMASK_VERSION=0x07B0
   -Wno-unknown-pragmas
 
+extra_scripts = ../scripts/stm32rdu.py
+
 [env:h8c09]
 platform = ststm32
 board = genericSTM32F103CB
@@ -143,3 +145,5 @@ build_flags =
   -DKNX_LED=PB5
   -DMASK_VERSION=0x07B0
   -Wno-unknown-pragmas
+
+extra_scripts = ../scripts/stm32rdu.py
diff --git a/examples/scripts/stm32rdu.py b/examples/scripts/stm32rdu.py
new file mode 100755
index 0000000..d0c5400
--- /dev/null
+++ b/examples/scripts/stm32rdu.py
@@ -0,0 +1,34 @@
+#!/usr/bin/env python
+from subprocess import run
+from datetime import datetime, timedelta
+from os.path import expanduser
+
+ocddir = expanduser("~/.platformio/packages/tool-openocd/")
+chip = "stm32f1x"
+
+def unlock(*args, **kwargs):
+  print("Please connect the board within the next two minutes.")
+  endtime = datetime.now() + timedelta(minutes = 1)
+  ret = 1
+  while ret != 0 and datetime.now() < endtime:
+    ret = run(["bin/openocd", "-f", "interface/stlink.cfg", "-f", "target/" + chip + ".cfg", "-c", "init", "-c", "reset halt", "-c", chip + " unlock 0", "-c", "reset halt", "-c", "exit"], cwd = ocddir).returncode
+  if ret != 0:
+    print("Timeout")
+  return ret
+
+try:
+  Import("env")
+except NameError:
+  import sys
+  if len(sys.argv) > 1:
+    chip = sys.argv[1]
+  if len(sys.argv) > 2:
+    ocddir = sys.argv[2]
+  unlock(None, None)
+else:
+  ocddir = env.PioPlatform().get_package_dir("tool-openocd")
+  options = env.GetProjectOptions()
+  for option in options:
+    if "unlock_chip" == option[0]:
+      chip = option[1]
+  env.AddCustomTarget("unlock", None, unlock)