Allow device to be offline indefinitely

Added button to allow the device to be offline indefinitely.

selfdrive/updated.py

@@ -194,6 +194,7 @@ def finalize_update() -> None:
   # FrogPilot update functions
   params = Params()
   params.put("Updated", datetime.datetime.now().astimezone(ZoneInfo('America/Phoenix')).strftime("%B %d, %Y - %I:%M%p"))
+  params.remove("OfflineMode")  # Reset the param since the user has internet connection again
 
 def handle_agnos_update() -> None:
   from openpilot.system.hardware.tici.agnos import flash_agnos_update, get_target_slot_number
@@ -226,6 +227,7 @@ class Updater:
     self._has_internet: bool = False
 
     # FrogPilot variables
+    self.disable_internet_check = self.params.get_bool("OfflineMode")
 
   @property
   def has_internet(self) -> bool:
@@ -318,6 +320,8 @@ class Updater:
       set_offroad_alert(alert, False)
 
     now = datetime.datetime.utcnow()
+    if self.disable_internet_check:
+      last_update = now
     dt = now - last_update
     if failed_count > 15 and exception is not None and self.has_internet:
       if is_tested_branch():