[ADD] point_of_sale: self-signed certificate for epos printers

Add documentation to explain how to use a ePos printer in HTTPS

closes odoo/documentation#1223

Signed-off-by: Castillo Jonathan (jcs) <jcs@odoo.com>

content/applications/sales/point_of_sale/overview.rst

@@ -10,3 +10,4 @@ Overview
    overview/getting_started
    overview/register
    overview/https
+   overview/epos_ssc

content/applications/sales/point_of_sale/overview/epos_ssc.rst

@@ -0,0 +1,91 @@
+=========================================
+Self-signed certificate for ePOS printers
+=========================================
+
+ePos printers are designed specifically to work with your Point of Sale system, which sends the
+tickets directly to the printer.
+
+Some models don't require an IoT box, but the connection between your web browser and the printer
+may require a :doc:`secure connection with the HTTPS protocol <https>`. If so, a self-signed
+certificate is necessary to use your printer.
+
+.. note::
+   Please check the following list of compatible `Epson ePOS printers
+   <https://c4b.epson-biz.com/modules/community/index.php?content_id=91>`_. This list includes the
+   following models:
+
+   - TM-H6000IV-DT (Receipt printer only)
+   - TM-T70II-DT
+   - TM-T88V-DT
+   - TM-L90-i
+   - TM-T20II-i
+   - TM-T70-i
+   - TM-T82II-i
+   - TM-T83II-i
+   - TM-T88V-i
+   - TM-U220-i
+   - TM-m10
+   - TM-m30
+   - TM-P20 (Wi-Fi® model)
+   - TM-P60II (Receipt: Wi-Fi® model)
+   - TM-P60II (Peeler: Wi-Fi® model)
+   - TM-P80 (Wi-Fi® model)
+
+Generate a Self-signed certificate
+==================================
+
+Access your ePOS printer's settings with your web browser by navigating to its IP address, for
+example, `http://192.168.1.25`.
+
+.. note::
+   - The printer automatically prints the IP address during startup.
+   - We recommend assigning a **fixed IP address** to the printer from the network router.
+
+Go to :menuselection:`Authentication --> Certificate List` and create a new **Self-Signed
+Certificate**.
+
+- **Common Name**: the IP address of the ePos Printer, for example, `192.168.1.25`
+- **Validity Period**: `10`
+
+Create and reboot the printer, go to :menuselection:`Security --> SSL/TLS`, and check if
+**Selfsigned Certificate** is selected.
+
+Export the Self-signed certificate
+==================================
+
+To avoid having to accept the self-signed certificate several times, you can export it and then
+import it to your web browser or mobile device.
+
+To do so, access your ePOS printer's settings with your web browser by navigating to its IP address,
+for example, `https://192.168.1.25`. Then, accept the self-signed certificate.
+
+.. note::
+   Note that the protocol is now **HTTPS**.
+
+Click on :menuselection:`Not secure --> Certificate is not valid`.
+
+.. image:: epos_ssc/browser-warning.png
+   :align: center
+   :alt: The web browser indicates that the connection to the printer is not secure.
+
+Go to the *Details* tab and click on **Export**.
+
+.. image:: epos_ssc/certificate-details.png
+   :align: center
+   :alt: Details of the ePOS printer certificate
+
+Import the Self-signed certificate to your browser (Chrome)
+===========================================================
+
+In your Chrome browser, go to :menuselection:`Settings --> Privacy and security --> Security -->
+Manage certificates`, then open the *Authorities* tab, click on **Import**, and select all
+functionalities of the certificate.
+
+.. tip::
+   You can directly access these settings by navigating to `chrome://settings/certificates`.
+
+Import the Self-signed certificate to your Android device
+=========================================================
+
+On your Android device, open the settings and search for *certificate*. Then, click on **Certificate
+AC** (Install from device storage), and select the certificate.

content/applications/sales/point_of_sale/overview/https.rst

@@ -16,4 +16,7 @@ Technical --> Parameters --> System Parameters`, then create a new parameter, ad
 values and click on *Save*.
 
 - **Key**: `point_of_sale.enforce_https`
-- **Value**: `True`
+- **Value**: `True`
+
+.. seealso::
+   - :doc:`epos_ssc`