Android app to check the barcode from a list

It shold be a mobile app connected to a sms gateway on a linux server. We have a cooperation with a mobile and laptops service. They make inventory check on their shelves. Here is a demo website of the project [login to view URL] I need a mobile App that will be connected to our existing DB and be able to check the QR and barcode and help the guy over there to search among shelves the part that he needs to repair. App will have as an input a JSON export link from our server with a list of parts with their QR and Barcodes. App will have one button - put onto my table - and generate for our server the json list of the part ids that the guy wants to take from a shelves and put onto his "table" so he is responsible next for these parts. Also app will notify the guy when new parts have been arrived to the shelves that are needed for reparing of some device where he is in charge. Include build free sip-sip calls using asterisk technology to call a manager, support team and guy who is responsible for suppliing parts if the part does not exist on a shelve or it is not working.