Correct voltage, enough current, resistors dividers for RX pin, all pull-up and pull-down wired with attention.
Nothing! It is not AT-friendly at all.
I wrongly supposed that it comes in default with AT firmware, and there is no need to flash anything to use it as a simple modem.
After a bit of a hassle I managed to connect to it (using AltSoftSerial) and get this answer:
NodeMCU 0.9.5 build 20150318 powered by Lua 5.1.4
I've bought this module from Mouser (https://eu.mouser.com/ProductDetail/485-2491)
I swear I have never flashed anything to it, I have still not wired the two buttons or the circuit logic to do this.
Please help me to understand what is wrong. I'm really new to the ESP world, forgive me if this is a dummy question:
Is it normal that I find the NodeMCU firmware on and module that is not soldered to a NodeMCU board?