"+BTDATA" is not received on classic bluetooth when the data is exactly or more than 20 symbols

[ToniVankov]

Answers checklist

• I have read the documentation ESP-AT Programming Guide and the issue is not addressed there.
• I have used the latest released firmware or have updated my ESP-AT branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

AT+GMR

AT+GMR
AT version:3.3.0.0-dev(s-da9d43f - ESP32 - Nov 30 2023 08:35:30)
SDK version:v5.0.4-dirty
compile time(b883f158):Dec 13 2023 10:07:21

ESP-AT Firmware Source

Download from https://github.com/espressif/esp-at.git

Hardware Information

ESP32-PICO-Mini-02

Power Supply used

External 3.3V

What is the expected behavior?

I expect it to receive "+BTDATA:" message for more than 20 symbols.

What is the actual behavior?

If I send 20 or more symbols via bluetooth the ESP not provide the unsolicited "+DATA:" message.

Probability of recurrence

For me this occur every time.

AT+SYSRAM?

AT+SYSRAM?
+SYSRAM:144532,138936
OK

Steps to reproduce

AT+BTINIT=1
AT+BTSPPINIT=2
AT+BTNAME="ESP_PICO"
AT+BTSECPARAM=1,1,"1234"
AT+BTSCANMODE=2
AT+BTSPPSTART

Connecting via PC bluetooth:
(MAC is hidden here for security reasons)
+BTSPPCONN:0,"xx:xx:xx:xx:xx:xx"

Send one symbol via PC bluetooth:
+BTDATA:1,A

Send 30 symbols via PC bluetooth:
(nothing...)

AT command port output

15:23: +BTSPPCONN:0,"xx:xx:xx:xx:xx:xx"
15:30: +BTDATA:3,A

AT log port output

(no logs)

More Information.

No response

[ustccw]

@Luxin812 please check.

[Luxin812]

@ToniVankov Recently, the master branch has fixed similar problems. You can update your firmware to the latest and test again to see if your problem is also fixed.(https://github.com/espressif/esp-at/actions/runs/8294336044)