Arduino - end user parameter input?

Question

Arduino

Hello!
More recently, I discovered arduino, bought an arduino, bought a starter kit, tinkering, it turns out. But until I googled this, well, let's say we take 2 arduins (conditionally), connect them to them via a wi-fi module, and connect a door opening sensor to one of them, in this case we send a signal to the "arduino-server". Suppose there are 10 such sets, the conditions are such that they should only work in pairs, i.e. you need to upload the sketch for the client, the sketch for the server to all devices. And in the future, it is necessary for each pair, say, to set the wi-fi settings. How to implement this, i.e. I would like to connect the device via usb and with the help of a small program just drive in the network name and password. Please poke your nose what to read on the topic of setting up arduino by the end user. The example is given purely conditionally.

Answer 1

Well, implement in the arduine the protocol for working on the COM port, which will write the received data to the eprom. And software that will implement the same protocol on a PC.