The simplest of items can cause the biggest issues sometimes. Here we have an ESP8266-01 module plugged into a simple relay controller.
The relevant AT instructions have been sent to the ESP8266 – all well and good. I’ve downloaded the mobile phone app to control it. What could possibly go wrong?
Well, the phone app simply tells me “Connection error!”. Yet when I try and connect via my browser the connection details are immediately shown in the ESP8266 monitor window, so there’s nothing really wrong with the ESP8266 connecting to my wifi, nor my browser connecting to the ESP8266.
It’s that phone app that is the root cause of my issue here. What’s more frustrating is that the ESP8266’s code is not available – that is, I can’t just upload something else as I can’t easily find out what it is telling the relay controller.
So simple. So frustrating!
[Update 3rd March 2018 13:50] Fixed! All will be revealed in due course [\End Update]