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suhailvs/milma_backend.md

Created Aug 10, 2021
Milma Backend

We use python programming language. Here is a quick tutorial. We use Django a python module for webdevelopment.

Billing

Flood Cess Calculations

The flood cess in Kerala is calculated on the value of the supply(CGST and SGST are not included in the value of supply).

eg:

• The value of the goods supplied is Rs. 1000.
• The GST rate is 12%. CGST is Rs. 60 and SGST is Rs. 60.
• The flood CESS is 1% and will have a value of Rs. 10.
• The total of your invoice will be Rs. 1130 only.
``````MRP = 1130
value = 1130*100/(12+1+100)
``````

Here is the live example: billings/views/billentry.py line 165: `amount_excl_tax = (amount * 100) / (item.gst_rate+cess_rate + 100)`

Thermal print

https://forum.ionicframework.com/t/printing-on-bluetooth-printers/17886/23

``````TXT_BOLD_OFF: '\x1b\x45\x00', // Bold font OFF
TXT_BOLD_ON: '\x1b\x45\x01', // Bold font ON

TXT_FONT_A: '\x1b\x4d\x00', // Font type A //normal font
TXT_FONT_B: '\x1b\x4d\x01', // Font type B //small font
TXT_FONT_C: '\x1b\x4d\x02', // Font type C //normal font

TXT_NORMAL: '\x1b\x21\x00', // Normal text
TXT_2HEIGHT: '\x1b\x21\x10', // Double height text
TXT_2WIDTH: '\x1b\x21\x20', // Double width text
TXT_4SQUARE: '\x1b\x21\x30', // Double width & height text

TXT_UNDERL_OFF: '\x1b\x2d\x00', // Underline font OFF
TXT_UNDERL_ON: '\x1b\x2d\x01', // Underline font 1-dot ON
TXT_UNDERL2_ON: '\x1b\x2d\x02', // Underline font 2-dot ON
TXT_ITALIC_OFF: '\x1b\x35', // Italic font ON
TXT_ITALIC_ON: '\x1b\x34', // Italic font ON

TXT_FONT_A: '\x1b\x4d\x00', // Font type A //normal font
TXT_FONT_B: '\x1b\x4d\x01', // Font type B //small font
TXT_FONT_C: '\x1b\x4d\x02', // Font type C //normal font
``````

Reports

Stock and Financial Report Calculations

``````Closing Balance(Stock)= opening balance + purchase - sales - stock adjustment
Closing Balance(Financial)= closing balance(stock) * purchase rate
Difference(Financial)= opening balance + purchase - sales - closing balance
``````