Here is an interesting bit of information 'the uploaded ESP-AT switches the serial peripheral (UART0) to different I/O pins'!!!!!
This was gleaned from here:-https://sigmdel.ca/michel/ha/esp8266/ES ... .html#v221
It is a long article, to find the relevant part search it for 'I/O pins'
ESP-AT Version 2.2.1 switches the serial peripheral I/O pins
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