Product tracking and tracing using Qr code

3 different users are expected
Farmers, Delivery man, consumer

Farmers will tag each product(say basket of mangoes) with QR code before going in for transit. That QR code, containing infos such as: Farmer's name, location, date of harvest, name of product, etc.,  Is already pre-listed in the database. Then the products will be in transit.

After successful delivery, the delivery guy will scan the qr codes to update thru the app(in the the database) that this qr code(this basket of mango) has reached this place(insert gps location of the phone) at this specific time (insert time).

Now, curious Consumers using the android app can then scan the QR and verify online that this product (mango) came from xxx location, and was delivered just yesterday(for example), and it was from PinoyBM Farms. Thats called product tracing.

The app should be able to store the data inthe phone itself in case there is no internet connection.

The farmer, then, can see thru the app how far his product has reached.

I'm Mon, an Engineering  student. And this is for study purposes only. Thank you for your help.