if you have a full HTTP service on the server and the file lives in a place where you can access it, a simple GET request with the URL will let you access the content of the file. Then it's a matter of parsing the content of that file. Saving the variables would just be using a text editor on the server side and create/update the file. Alternatively the client could also send a request to an application running on the server to create/update the file (a python or PHP script for example)
if you have a full FTP service, then through an FTP library you could download or upload a file to the server
explore. You can always come back if you have specific questions, the forum is here to help out (just make sure you post all the details of your code (using code tags) and describe your circuit)
well you activate the wifi layer so it does draw some current - way more than when idle of course. there are articles on line talking about this (an example)
it uses only the flash memory you see at compile time. There is RAM involved of course
I've been coding and programming my SmartHome, with Sinric and other Smart-IOT-Providers. Because of you, I've my own Smart-IOT-Cloud. Thanks man. The only thing I have to do now, is: register a power WebspaceProvider, like GoDaddy, or Ionos (Germany).
Greetings from Germany man !!! You saved my week, not day.