Develop a point of sale system using android device as display and an asp.net as back-end with sql server db.
Main app is run on asp.net web service and android front end is used to interact with system. It shows keyboard current weight on weight scale (etc). There is item weight adjustment that is slider control on the screen (there should be formula function in code that we should be able to change without much complexity).
Server has one or more weight scales connected using serial port. System read weight scale from serial port. One server might be used by multiple android frontend. Each can be configured to read from one of the connected weight scale.
There are items those has price per gram.
Each receipt and customer information is saved in the system database.
in Each receipt (one transaction) customer may purchase or sale items.
Design docs for sql, webservice and android app is required and need approval before proceeding to coding.
All three parts need to have unit test writen with at least 75% code coverage and passing.