Devices

Tablets as registers and customer screens

Lock an Android tablet, iPad or Windows tablet to Mavos so it opens the right screen at startup and stays there.

A register or a customer screen can run on its own tablet instead of a dedicated terminal. Mavos runs in the tablet's browser; a kiosk-style app or the tablet's own lockdown feature keeps it on that one screen so nobody can wander off into email or the web.

Find the launch link

In Settings → Devices, every device has a launch link — the link icon on its row. That's the web address the tablet should open automatically at startup. Before the device is paired it shows the pairing screen; afterwards it opens straight into the register or customer screen.

Android: Fully Kiosk Browser

Install Fully Kiosk Browser from the Google Play Store and buy its Plus licence for the tablet.
In Fully's settings, set the Start URL to the device's launch link, then turn on Kiosk Mode (choose an exit PIN so only staff can leave it), Launch on Boot, and Keep Screen On.
Open Fully. It shows the pairing screen — enter the pairing code from Settings → Devices. Pair from inside Fully, not from a regular browser like Chrome, since each app keeps its own separate sign-in.

For a tablet customers can reach, lock it down properly. Set up as above, the exit code is a deterrent rather than a lock, and a determined person can still get out to the home screen. To make Android itself enforce the lock, install Fully Kiosk Provisioner (free, from the Play Store) on a second device and use it to set the tablet up by scanning a code.

⚠ This only works on a tablet that has been factory reset and not yet set up — Android only allows it before an account is added. So treat it as part of setting up a new tablet, not something you can add to the one already on your counter. If the tablet is already in service and working, the ordinary setup above is fine for staff-facing use.

iPad: Home Screen and Guided Access

Open the device's launch link in Safari, then tap Share → Add to Home Screen.
Open the app from the Home Screen icon — not from Safari — and enter the pairing code there. This step matters: a Home Screen app keeps its own sign-in, separate from Safari, so a code entered in Safari itself won't carry over to it.
Turn on Guided Access (Settings → Accessibility → Guided Access on the iPad itself), open the Mavos Home Screen app, then triple-click the side (or Home) button to lock the iPad to it. In Display & Brightness, set Auto-Lock to Never so the screen doesn't sleep mid-shift. Set Auto-Lock to Never even if your iPad is up to date — on older versions of iPadOS, an app added to the Home Screen can't hold the screen awake by itself, so this setting is what keeps the screen on.

⚠ Guided Access does not survive a restart. After a power cut or an overnight reboot the iPad comes back unlocked, and somebody has to walk over and triple-click it again. That's usually fine for a staff-facing register and a poor fit for an unattended customer screen.

For any tablet nobody is around to unlock after it restarts, ask whoever manages your devices about Single App Mode through Apple Configurator or a mobile device manager. It locks the iPad on its own after every restart, with nobody touching it. ⚠ Setting that up erases the iPad, so do it before the iPad goes into service, not after.

Windows tablet: Mavos Screen Helper

Install the Mavos Screen Helper (download it from Settings → Devices) and pair it — from the register's own Settings → Screens tab if it's a register, or from the tablet's pairing page if it's a customer screen or a standalone kiosk. Once paired, the Helper opens the right screen full-screen automatically whenever the tablet starts up or signs in.

What a paired customer screen does

Once a tablet is paired as a customer screen, it shows "Waiting for the register to connect…" until the register opens, then mirrors each sale live — items, totals, and a receipt QR code at the end — exactly like a second monitor would. Between sales it plays your marketing loop.

The tablet becomes the register's only customer screen. A register shows the customer's order on one screen, so pairing a tablet replaces the second window on the till computer rather than running alongside it — that window stops receiving orders, stops switching to kiosk with the tablet, and stops counting as connected. Open it and it says so, naming the tablet; close a window that was already open when you paired, so it doesn't sit there on the last thing it was showing. One tablet per register and one register per tablet: Settings → Devices won't let you add a second customer screen to a register that already has one. To go back to a second screen on the till computer, unpair the tablet there.

From the register's More menu you can:

Enable Kiosk — turn the tablet into a self-service ordering screen for the next customer (only shown once a kiosk app is available). It opens a Customer screen panel; press Switch to kiosk there to make the change. Back to customer display, then Switch to customer display, returns it. Switching back is refused while a card payment is running on the tablet.
Customer touch: On / Off — turn touch on the customer-facing screen on or off. With a tablet paired this always applies to the tablet, since that is the register's customer screen.

The register and the tablet each just need their own internet connection — they don't need to be on the same Wi-Fi network, and they don't need to be in the same building.

If something looks stuck

"Waiting for the register to connect…" doesn't go away: check the register is open, signed in and connected to the internet.
The customer screen looks a few seconds behind after a Wi-Fi drop: it catches back up on its own once the connection returns — there's no offline mode, so both tablets need a working internet connection to stay in sync.
After rotating a device's link key in Settings → Devices, reload the customer screen tablet so it picks up the new key.
The tablet asks to be paired again. A device that hasn't been used for a long stretch is signed out for security. Get a fresh code from Settings → Devices and enter it on the tablet's own screen — stay in the app you set up rather than opening a browser, for the same reason you paired it there in the first place. On a customer screen, tap Set up this screen first; that screen shows a plain message rather than a code box so a customer never sees one.
You entered a code for the wrong device. The tablet says so and opens whichever device the code actually belonged to. Get the right code from that device's row in Settings → Devices and try again.
If the tablet keeps getting distracted (notifications, the wrong app opening), double-check its kiosk/lockdown settings — the launch link, Kiosk Mode/Guided Access, and Auto-Lock/Keep Screen On above are the usual culprits.