ESP8266 Community Forum

I use the Arduino IDE to program esp-01 devices and to send AT commands via the serial monitor. Does downloading a simple application to the device wipe out the AT command processor, or do they co-exist? I successfully downloaded my program to the device but it no longer responds to any AT commands at all.

Yes, as soon as you upload your own code to the device, the AT firmware gets overwritten.

thank you very much.