[IMP] iot: esc-pos ESC * support documentation

Documentation regarding the fix:
odoo/odoo#126689

opw-3351084,3341907

Authored by: lse-odoo <lse@odoo.com>
Co-authored by: tiku-odoo <tiku@odoo.com>
Co-authored by: Felicious <feku@odoo.com>
Co-authored by: jero-odoo <jero@odoo.com>

closes #6065

X-original-commit: 974c59f
Signed-off-by: StraubCreative <zst@odoo.com>
Signed-off-by: Zachary Straub (zst) <zst@odoo.com>

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

@@ -99,6 +99,249 @@ Printer`. Follow the steps and select the *make* and *model* corresponding to th
    Epson and Star receipt printers and Zebra label printers do not need a driver to work. Make sure
    that no driver is selected for those printers.
 
+Epson configuration special case
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Most Epson printers support printing receipts in Odoo :abbr:`POS (Point of Sale)` using the `GS v 0`
+command. However, the following Epson printer models do not support this command:
+
+- TM-U220
+- TM-U230
+- TM-P60
+- TMP-P60II
+
+Bypass this issue by configuring the printer to use the `ESC *` command instead.
+
+Process to force ESC * command
+******************************
+
+Epson printer compatibility
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The first step is to check whether the printer is incompatible with `GS v 0` command.
+
+.. seealso::
+
+   - `Epson GS v 0 documentation <https://reference.epson-biz.com/modules/ref_escpos/index.php?
+     content_id=94>`_ for `GS v 0` compatible printers.
+   - `Epson ESC * documentation <https://reference.epson-biz.com/modules/ref_escpos/index.php
+     ?content_id=88>`_ for `ESC *` compatible printers.
+
+If the printer is not compatible with the `ESC *` command then the following process is not
+possible. Should the printer be compatible to use the `ESC *` command to print, follow this process
+to configure the printer with the :abbr:`IoT (Internet of Things)` box.
+
+IoT box configuration for ESC *
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+To configure the :abbr:`IoT (Internet of Things)` box to use the `ESC *` command to print, go to the
+:abbr:`IoT (Internet of Things)` box homepage by navigating to :menuselection:`IoT app --> IoT
+Boxes`. Then click on the :guilabel:`IP address` and this will direct to the :abbr:`IoT (Internet of
+Things)` box homepage.
+
+**Choosing the printer**
+
+Now click on the :guilabel:`Printers server` button. This will redirect the browser to the *CUPS*
+page. Next, go to :menuselection:`Administration --> Printers --> Add Printer`, choose the printer
+that should be modified, and then click :guilabel:`Continue`.
+
+.. tip::
+   If the name of the printer is still uncertain, take the following steps:
+
+   #. Take note of the listed printers on the *CUPS* page.
+   #. Turn the printer off and refresh the page.
+   #. Now compare the difference with the first list to see which printer disappeared.
+   #. Turn the printer back on and refresh the page again.
+   #. Double-check the list again to see if the printer re-appears.
+   #. The printer that disappeared and reappears again on the listed printers is the name of the
+      printer in question.
+
+   .. note::
+      This can be :guilabel:`Unknown` under :guilabel:`Local printers`.
+
+**CUPS naming convention**
+
+`CUPS` will prompt the admin for three pieces of information: the :guilabel:`Name`,
+:guilabel:`Description` and the :guilabel:`Location`. The last two pieces of information do not need
+to be specific, however, the :guilabel:`Name` should follow a particular convention to work with the
+`ESC *` command.
+
+The :guilabel:`Name` should match this convention:
+`<printer_name>__IMC_<param_1>_<param_2>_..._<param_n>__`
+
+A breakdown of the naming convention:
+
+- `printer_name`: This is the printer name. It can be any character as long as it does not contain
+  `_`, `/`, `#`, or ` ` (space character).
+- `IMC`: This stands for *Image Mode Column* (the simplified name for `ESC *`).
+- `param_1`: This stands for the specific parameter:
+
+  - `SCALE<X>`: Scale of the picture (with the same aspect ratio). `X` should be an integer
+    describing the scale percentage that should be used.
+
+    .. example::
+       `100` is the original size, `50` is half the size, `200` is twice the size.
+
+  - `LDV`: *Low Density Vertical* (will be set to *High Density Vertical* if not specified).
+  - `LDH`: *Low Density Horizontal* (will be set to *High Density Horizontal* if not specified).
+
+    .. note::
+       *Density* parameters might need to be configured in a particular way depending on the printer
+       model.
+
+.. seealso::
+   Visit `Epson's ESC * documentation
+   <https://reference.epson-biz.com/modules/ref_escpos/index.php?content_id=88>`_ and click on the
+   printer model printer in the table above to see if the printer should set these parameters.
+
+.. example::
+   The following are examples of proper and improper name formatting:
+
+   Proper name formatting:
+
+   - `EPSONTMm30II__IMC__`
+   - `EPSON_TM_U220__IMC_LDV_LDH_SCALE80__`
+
+   Improper name formatting (this will not prevent printing, but the result might not have the
+   expected printed output):
+
+   - `EPSON TMm 30II` -> The name can't have spaces.
+   - `EPSONTMm30II` -> The name itself is correct, but it won't use `ESC *`.
+   - `EPSONTMm30II__IMC` -> This name is missing the end `__`.
+   - `EPSONTMm30II__IMC_XDV__` -> The parameter `XDV` does not match any existing parameters.
+   - `EPSONTMm30II__IMC_SCALE__` -> The parameter `SCALE` is missing the scale value.
+
+**Finish adding a printer**
+
+After setting the name of the printer with the appropriate naming convention, click
+:guilabel:`Continue`. Next, set the :guilabel:`Make` value to :guilabel:`Raw` and for the
+:guilabel:`Model` value, set this to :guilabel:`Raw Queue (en)`.
+
+After completing these steps, click :guilabel:`Add Printer`. If everything was done correctly, the
+page should redirect to the *Banners* page.
+
+At this point the printer should have been created, now the :abbr:`IoT (Internet of Things)` box
+just needs to detect it and then sync to Odoo's server (this could take a few minutes).
+
+**Adding the printer to Odoo PoS**
+
+Once the printer is visible on the Odoo database, don't forget to choose it in the :abbr:`PoS (Point
+of Sale)`configuration as the :abbr:`IoT (Internet of Things)` printer. Navigate to
+:menuselection:`Pos App --> Settings --> Connected Devices --> IoT Box --> Receipt Printer -->
+Save`.
+
+.. note::
+   If the printer was set up incorrectly (it is still printing random text or the printed receipt is
+   too big or small), then it cannot be modified via the printer name with *CUPS*. Instead, the
+   above process can be repeated to set up another printer from scratch to create one with modified
+   parameters.
+
+**Example setup of the Epson TM-U220B printer using ESC**
+
+.. spoiler::
+   Click this text to reveal the example
+
+   The following is an example of the troubleshooting process for a TM-U220B printer model using the
+   `ESC *` command. The receipt pictured below is an example of a receipt that is printing correctly
+   due to proper formatting (in theory):
+
+   .. image:: troubleshooting/receipt-example.png
+      :align: center
+      :alt: Properly formatted receipt picture from a demo database.
+
+   Trying to print this receipt right-away prior to the proper formatting will not work as the
+   TM-U220B printer model does not support `GS v 0`. Instead random characters will print:
+
+   .. image:: troubleshooting/receipt-print-random-letters.png
+      :align: center
+      :alt: Printer paper with seemingly random characters.
+
+   To properly configure formatting for the Epson TM-U220B printer model take the following steps.
+
+   After consulting Epson's website for compatibility for both of the commands: `GS v 0
+   <https://reference.epson-biz.com/modules/ref_escpos/index.php?content_id=94>`_ and `ESC *
+   <https://reference.epson-biz.com/modules/ref_escpos/index.php?content_id=88>`_, it can be seen
+   that indeed the TM-U220B is not compatible with `GS v 0`, but is compatible with `ESC *`.
+
+   .. image:: troubleshooting/epson-compatibility-compare.png
+      :align: center
+      :alt: Epson compatibility evaluation from Epson website.
+
+   When adding the printer, *CUPS* will ask which printer should be added:
+
+   .. image:: troubleshooting/add-printer.png
+      :align: center
+      :alt: Administration menu, add printer selection.
+
+   In this case, the printer is connected via :abbr:`USB (Universal Serial Bus)` so it won' be part
+   of the :guilabel:`Discovered Network Printers`. Instead it is likely part of the
+   :guilabel:`Unknown` selection under :guilabel:`Local Printers`. By unplugging the printer's
+   :abbr:`USB (Universal Serial Bus)` cable from the :abbr:`IoT (Internet of Things)` box and
+   refreshing the page, the :guilabel:`Unknown` printer disappears. By plugging it back in, the
+   printer reappears, so it can be said that this is the printer in question.
+
+   For the naming convention, since it will need to print using the `ESC *` command, it is
+   imperative to add `__IMC`. Reference the printer model on `Epson's ESC * site
+   <https://reference.epson-biz.com/modules/ref_escpos/index.php?content_id=88>`_ to find out more
+   about the *density* parameters.
+
+   .. image:: troubleshooting/epson-tm-u220-specification.png
+      :align: center
+      :alt: Epson TM-U220 specifications on manufacturer's website.
+
+   For this particular model, TM-U220, `m` should be equal to 0 or 1. While referencing the
+   :guilabel:`Description` below the pink box in the above picture, the `m` values could be 0, 1, 32
+   or 33. So in this printers case, the `m` value can NOT be 32 or 33 (otherwise there will be
+   random characters printed).
+
+   The table includes the numeric values: 32 and 33, they both occur if the :guilabel:`Number of
+   bits for vertical data` is set to 24. This means that is a *High Vertical Density*. In the case
+   of configuring the Epson TM-U220, the *Low Vertical Density* will need to be forced, as this
+   printer model does not support *High Vertical Density* for this command `ESC *`.
+
+   To add a *Low Vertical Density*, add the `LDV` parameter to the naming convention.
+
+   .. image:: troubleshooting/add-printer-filled.png
+      :align: center
+      :alt: Add a *Low Vertical Density* (the `LDV` parameter) to the naming convention.
+
+   Click :guilabel:`Continue` to proceed. Next, set the :guilabel:`Make` value to :guilabel:`Raw`
+   and for the :guilabel:`Model` value, set this to :guilabel:`Raw Queue (en)`.
+
+   .. image:: troubleshooting/add-printer-add.png
+      :align: center
+      :alt: Epson TM-U220 specifications on manufacturers website.
+
+   However when trying to print with the naming convention: `EpsonTMU220B__IMC_LDV__`, it will print
+   the receipt, but it will be too big and outside the margin. To resolve this, add a new printer
+   (and naming convention) with the `SCALE<X>` parameter to adapt to our receipt size.
+
+   Here are some examples:
+
+   .. list-table::
+      :header-rows: 1
+
+      * - Printer Naming Convention
+        - `EpsonTMU220B__IMC_LDV__`
+        - `EpsonTMU220B__IMC_LDV_SCALE75__`
+        - `EpsonTMU220B__IMC_LDV_LDH__`
+        - `EpsonTMU220B__IMC_LDV_LDH_SCALE35__`
+      * - .. image:: troubleshooting/receipt-example.png
+             :align: center
+             :alt: Receipt example format.
+        - .. image:: troubleshooting/tm-u220-ldv.png
+             :align: center
+             :alt: Receipt format using naming convention: EpsonTMU220B__IMC_LDV__.
+        - .. image:: troubleshooting/tm-u220-ldv-scale75.png
+             :align: center
+             :alt: Receipt format using naming convention: EpsonTMU220B__IMC_LDV_SCALE75__.
+        - .. image:: troubleshooting/tm-u220-ldv-hdv.png
+             :align: center
+             :alt: Receipt format using naming convention: EpsonTMU220B__IMC_LDV_LDH__.
+        - .. image:: troubleshooting/tm-u220-ldv-hdv-scale35.png
+             :align: center
+             :alt: Receipt format using naming convention: EpsonTMU220B__IMC_LDV_LDH_SCALE35__.
+
 The Zebra printer doesn't print anything
 ----------------------------------------
 
@@ -109,8 +352,7 @@ User Interface --> Views` in :ref:`developer mode <developer-mode>` and look for
 template.
 
 .. seealso::
-   Check out Zebra's instructions on printing :abbr:`ZPL (Zebra Programming Language)` files
-   `here
+   Check out Zebra's instructions on printing :abbr:`ZPL (Zebra Programming Language)` files `here
    <https://supportcommunity.zebra.com/s/article/Print-a-zpl-file-using-the-Generic-Text-Printer>`_.
 
 Barcode scanner