I am trying to work out which is the widely accepted standard wifi shield for the Arduino Mega 2560 that can easily connect to a smartphone-created hotspot without me losing all my digital IO (as they're used for other stuff).
I have found that the official Arduino one is discontinued and there seems to be conflicting info out there with many people making them.
The one I most often see is something like the ESP8266, but it just seems to be a 4 pin module. Others I have seen are a whole daughterboard that covers the entire mega or uno.
Thank you in anticipation.