Machine productivity with Arduino and wifi?


Maybe this is not right place to ask, but maybe someone could advice me a little.

I would like to check machine productivity with Arduino and wifi logging...

Four digital inputs needed, wifi connection and data aqucition software to collect information.

What need to get start?

Thank You

What need to get start?

Some real requirements.

What digital inputs? How do they define “productivity”?
What WiFi shield/hardware?
What server are you sending data to? What is the server supposed to do with the data?