For each AT command, list the possible ERROR results - see:
viewtopic.php?f=3&t=3047&p=11329#p11329
Also, provide an explanation of each ERROR result - with a description of what real-life scenarios might cause the ERROR, and suggested recovery actions.
Yes, some of this is already in the FAQs, but it should be included in the Interface Guide - error recovery is, after all, an essential part of all interfacing…