ESP8266 Community Forum

Posted: **Thu Feb 16, 2017 5:41 pm**

A week ago I hooked up an ESP12 to CH340 interface cable, established communication, and connected to my WiFi network.
Today I went back to that device. Hooked it up the same way. It boots fine and reports:

d`;lûn't use rtc mem data
sdslÌÿ
Ai-Thinker Technology Co.,Ltd.

ready
WIFI CONNECTED
WIFI GOT IP

but it never comes back to a point of accepting AT commands (or any input, for that matter).
What's happened?
Thx

Posted: **Fri Feb 17, 2017 12:00 pm**

Since the firmware is clearly running, I would guess a poor connection on the TX pin of the ESP.

Posted: **Fri Feb 17, 2017 3:51 pm**

I'll spare you the details of all the screwing around that led to the solution.
The problem was that the default serial configuration for Putty has
Flow Control = xon/xoff
Somehow Putty is seeing xoff in the response from the ESP12 (though I have no idea why).
Set
Flow Control = NONE
and the problems disappear

ESP8266 Community Forum

ESP12 boots, connects, but won't accept commands

ESP12 boots, connects, but won't accept commands

Re: ESP12 boots, connects, but won't accept commands

Re: ESP12 boots, connects, but won't accept commands