How do I access a PC at the same local Network, via Tablet?

Bottom line: I need to create an Android App to locate a PC and save files at an specified directory.

There will be some Andoid tablets that will have aplications that collect and save data, and I need to send this data to a specified directory at a Pc. They will be connected by a local WiFi network, but internet will not always be avaiable.

Is there a way that I can save the data(images and text) like a local network, just save it to the directory, or do I have to send them by some http protocol? How do I find the local PCs, using unity Android? Is there a simple way to solve this?

You’re probably going to need client-side code running on the PC that can accept a network connection from your tablet and process the data it sends. Most networks and devices don’t allow free access to their hard drives as a security measure. The only other way I would know of to do so would be to run an FTP server on the PC.