how to abort a CIPSENDBUF

[doughboy]

If say I send a CIPSENDBUF=0,2048
then I decide I don't want to send after all. How do I abort the CIPSENDBUF command?
Is there a character sequence that will "escape" from "data" mode into "command" mode?
There seems to be nothing else I can do until I send 2048 characters,

[flyfish]

Hi,
You can try string +++ to give up AT+CIPSENDBUF.

[doughboy]

Nothing works.
As it is now, the only way to get back to command mode is to do a hard reset, or to keep writing dummy data until esp8266 gets what it thinks is the amount of bytes it needs to receive. Not a good design by anyone's standards, so definitely room for product improvement.

[flyfish]

Hi,
Which version of your AT and SDK.
following is my log,"+++" works well.String "+++" is without "\r\n".

AT+CIPSENDBUF=10

2,1

OK
>
Recv 10 bytes

2,SEND OK
AT+CIPSENDBUF=10

3,2

OK
> //send string 1234 ,then +++.
SEND Canceled
AT+GMR

AT version:0.50.0.0(Sep 18 2015 20:55:38)
SDK version:1.4.0
compile time:Sep 18 2015 21:32:07
OK

[doughboy]

you are right, I just tested this just now on 1.4 and it does abort.

I also just verified and confirmed this only works in 1.4. It does not work in 1.3.

For a long time since I posted this thread and emailed espressif about this and asked for an enhancement for ability to switch back to command mode, nobody bothered answering.

Then now conveniently you replied. I'm almost certain you work for espressif.

There was no mention of this new feature either in release notes, nor in updated documentation for 1.4. Hence you must work for espressif to know this.

There is another issue I am dealing with by email, You can probably tell what it is if you are working for espressif.

[flyfish]

Hi,
It also works well in sdk1.3.
--------------------------------------------------------------------------
AT+GMR

AT version:0.40.0.0(Aug 8 2015 14:45:58)
SDK version:1.3.0
compile time:Aug 8 2015 17:35:24
OK
AT+CIPSTART="TCP","192.168.0.101",1188

CONNECT

OK
AT+CIPSENDBUF=10

1,0

OK
>
Recv 10 bytes

1,SEND OK
AT+CIPSENDBUF=10

2,1

OK
> //send string 1234 ,then +++.
SEND Canceled
AT+GMR

AT version:0.40.0.0(Aug 8 2015 14:45:58)
SDK version:1.3.0
compile time:Aug 8 2015 17:35:24
OK