This is a good initiative and a doable solution. My first professional project out of school was to develop a POS for pharmacies and supermarkets in Ghana. This gave me a lot insight into our pharmacies work in Ghana. Now l develop mostly Android apps for both local and international clients. The ubiquitous spread of mobile phones(prices are going down each day) and the wide adoption of technology in most developing countries gives me much confidence that this solution can be implemented. The engineers involve in the implementation of the mobile app must take cognizance of internet speed and availability so the solution can remain robust. Security and privacy should also play a vital role in the design and implementation of the solution by the engineers. Security on the Android platform is getting better but the engineers must make a conscious effort at encrypting sensitive data. Also the overall solution must consider the literacy level of all users involved.