[IMP] iot: Add part regarding screen

Add  more details as of how to connect a screen to the IoT box
and how it can be used.

OPW-2962462

closes odoo/documentation#2730

Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com>

content/applications/productivity/iot/config/pos.rst

@@ -48,10 +48,9 @@ Then, you have to connect the peripheral devices to your IoT Box.
 
 -  **Scale**: Connect your scale and power it on.
 
--  **Customer Display**: Connect a monitor to the IoT Box using an HDMI
-   cable. You can also access the Customer Display from any other computer
-   by accessing the IoT Box homepage and clicking on the *POS Display*
-   button.
+-  **Customer Display**: Connect a screen to the IoT Box to display the
+   PoS order. Please refer to
+   :doc:`/applications/productivity/iot/devices/screen`.
 
 -  **Payment terminal**: The connection process depends on the terminal,
    please refer to the :doc:`payment terminals documentation

content/applications/productivity/iot/devices.rst

@@ -8,6 +8,7 @@ Devices
    :titlesonly:
    :glob:
 
+   devices/screen
    devices/measurement_tool
    devices/camera
    devices/footswitch

content/applications/productivity/iot/devices/screen.rst

@@ -0,0 +1,100 @@
+================
+Connect a screen
+================
+
+In Odoo, an :abbr:`IoT (Internet of Things)` Box can be connected to a screen display. After being
+connected, the screen can be used to display a :abbr:`PoS (Point of Sale)` order to a client.
+
+.. image:: screen/screen-pos-client-display.png
+   :align: center
+   :alt: An example of a PoS (point of sale) order on a screen display.
+   
+.. note::
+   Access the customer display from any other computer by going to the :abbr:`IoT (Internet of Things)`
+   Box homepage and clicking on the :guilabel:`POS Display` button.
+
+
+Connection
+==========
+
+The way to connect the screen display to the :abbr:`IoT (Internet of Things)` Box differs depending
+on the model.
+
+.. tabs::
+
+   .. tab:: IoT Box model 4
+
+      Connect up to two screens with Micro-HDMI cables on the side of the :abbr:`IoT (Internet of Things)`
+      Box. If two screens are connected, they can display distinct content (see usage below).
+
+   .. tab:: IoT Box model 3
+
+      Connect the screen with an HDMI cable on the side of the :abbr:`IoT (Internet of Things)` Box.
+
+.. important::
+   Screen(s) should be connected before the :abbr:`IoT (Internet of Things)` Box is switched on. If it
+   is already on, connect the screen(s), and then restart the :abbr:`IoT (Internet of Things)` Box by
+   unplugging it and plugging it back into its power source.
+
+.. warning::
+   The usage of HDMI/Micro-HDMI adapters may cause issues which will result in a blank, black screen on
+   the screen display. Cable usage is recommended.
+
+If the connection was successful, the screen should display the :guilabel:`POS Client display`
+screen.
+
+.. image:: screen/screen-pos-client-display-no-order.png
+   :align: center
+   :alt: The default "POS Client Display" screen that appears when a screen display is successfully
+         connected to an IoT Box.
+   
+The screen should also appear in the list of :guilabel:`Displays` on the :abbr:`IoT (Internet of
+Things)` Box homepage.
+
+.. image:: screen/screen-screen-name-example.png
+   :align: center
+   :alt: An example of a screen display name shown on the IoT Box homepage.
+   
+.. note::
+    If no screen is detected, a default display named :guilabel:`Distant Display` will be used instead.
+
+    .. image:: screen/screen-no-screen.png
+       :align: center
+       :alt: The "Distant Display" screen name will be used if no screen is detected.
+   
+Usage
+=====
+
+Show Point of Sales orders to customers
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+To use the screen in the :guilabel:`Point of Sale` app, go to :menuselection:`Point of Sale -->
+Configuration --> Point of Sale`, open the desired screen, click on :guilabel:`Edit`, and enable the
+:guilabel:`IoT Box Devices` feature.
+
+Now, select :guilabel:`IoT Box` in the drop-down menu and choose the screen in the
+:guilabel:`Customer Display` option. Then, click :guilabel:`Save`.
+
+    .. image:: screen/screen-pos-screen-config.png
+       :align: center
+       :alt: Connect the screen display to the Point of Sale app.
+   
+The screen is now available for :abbr:`PoS (Point of Sale)` sessions. A "screen" icon will appear
+in the top bar to inform the connection status with the screen.
+
+    .. image:: screen/screen-pos-icon.png
+       :align: center
+       :alt: The "screen" icon on the Point of Sale display shows the connection status with the screen.
+
+The screen will automatically show the :abbr:`PoS (Point of Sale)` orders and update when changes are
+performed on the order.
+
+.. image:: screen/screen-pos-client-display.png
+   :align: center
+   :alt: An example of a PoS order on a screen display.
+
+Display a website
+~~~~~~~~~~~~~~~~~
+
+Opening the screen form view at :menuselection:`IoT --> Devices --> (screen device)` allows the user
+to choose a particular website URL to display on the screen with the :guilabel:`Screen URL` field.