Works offline
Because the far gate never has good signal.
- The scanner keeps a copy of who is expected, carries on admitting people while the connection is gone, and sends everything up when it comes back.
- It will not go offline unless it has that copy to work from. It tells your staff instead of waving people through blind — an honest "not now" beats an admission nobody can account for later.
- If anything fails to sync afterwards you are told, with a list you can export and work through. A scan is never quietly lost.
