I've uploaded an Access Point sketch, successfully (no errors), but I have been unable to connect to it, wirelessly, via a Serial to WiFi Terminal app on my Android - or anything else.
I'm under the impression, given my own perhaps flawed understanding of these things, that that's all I should need to interface the two.
NodeMCU_AP ↔ Android
"Connection failed: unknown host"
If I'm mistaken then what do I lack?
I suggest you read this short explanation of the different network layers and protocols.
The WiFi connection is one of the lowest layers. You have to use protocols on top of that in order to actually communicate. Usually, you would use TCP or UDP.
Pieter
So, as it turns out, my NodeMCU does OK with access point sketch from the teach me micro site (above),
in that I can change the LED state through the webpage.
My blunder was using a password of less than 8 characters.
I still need to find a way to send/receive serial data (Android_Send - Hello; NodeMCU_Reply - Ready) still.