Add pd daemon service

script/reference-device/dhcp6_pd_daemon.py

@@ -0,0 +1,56 @@
+import dbus
+from dbus.mainloop.glib import DBusGMainLoop
+import gi.repository.GLib as GLib
+import time
+import subprocess
+
+dbus_loop = DBusGMainLoop(set_as_default=True) 
+bus = dbus.SystemBus()
+obj = None
+iface = None
+
+def properties_changed_handler(interface_name, changed_properties, invalidated_properties):
+    if "Dhcp6PdState" in changed_properties:
+        new_state = changed_properties["Dhcp6PdState"]
+        print(f"Dhcp6PdState changed to: {new_state}")
+        if new_state == "running":  # Check for string equality
+            try:
+                subprocess.run(["sudo", "service", "dhcpcd", "restart"], check=True)
+                print("Successfully restarted dhcpcd service.")
+            except subprocess.CalledProcessError as e:
+                print(f"Error restarting dhcpcd service: {e}")
+        elif new_state == "stopped":
+            try:
+                subprocess.run(["sudo", "cp", "/etc/dhcpcd.conf.orig", "/etc/dhcpcd.conf"], check=True)
+                print("Successfully restarted dhcpcd service.")
+            except subprocess.CalledProcessError as e:
+                print(f"Error restarting dhcpcd service: {e}")
+
+def connect_to_signal():
+    global obj, iface
+    try:
+        obj = bus.get_object('io.openthread.BorderRouter.wpan0', '/io/openthread/BorderRouter/wpan0')
+        iface = dbus.Interface(obj, 'org.freedesktop.DBus.Properties')
+        obj.connect_to_signal("PropertiesChanged", properties_changed_handler, dbus_interface=iface.dbus_interface)
+        print("Connected to D-Bus signal.")
+    except dbus.DBusException as ex:
+        print(f"Error connecting to D-Bus: {ex}")
+        obj = None
+        iface = None
+
+
+def check_and_reconnect():
+    if obj is None:
+        connect_to_signal()
+
+def main():
+    connect_to_signal()
+
+    loop = GLib.MainLoop()
+
+    GLib.timeout_add_seconds(5, check_and_reconnect)  # Check every 5 seconds
+
+    loop.run()
+
+if __name__ == '__main__':
+    main()