ESP32 Forum

Hello.
I'm using ESP32-wroom-32D to test the BLE server mode of ESP-AT.
I want to see what data was written in the GATT write Characteristic.
When I look up the data, it says to use AT+BLEGATTCRD, but when I use the command, it only returns an error.
I'm using the 'ESP32-WROOM-32-AT-V3.2.0.0'.



For UUID C302,It's write Characteristic.

The following is my command procedure.

AT+BLEINIT=2

OK
AT+BLEGATTSSRVCRE

OK
AT+BLEGATTSSRVSTART

OK
AT+BLEGATTSCHAR?
+BLEGATTSCHAR:"char",1,1,0xC300,0x02
+BLEGATTSCHAR:"desc",1,1,1,0x2901
+BLEGATTSCHAR:"char",1,2,0xC301,0x02
+BLEGATTSCHAR:"desc",1,2,1,0x2901
+BLEGATTSCHAR:"char",1,3,0xC302,0x08
+BLEGATTSCHAR:"desc",1,3,1,0x2901
+BLEGATTSCHAR:"char",1,4,0xC303,0x04
+BLEGATTSCHAR:"desc",1,4,1,0x2901
+BLEGATTSCHAR:"char",1,5,0xC304,0x08
+BLEGATTSCHAR:"char",1,6,0xC305,0x10
+BLEGATTSCHAR:"desc",1,6,1,0x2902
+BLEGATTSCHAR:"char",1,7,0xC306,0x20
+BLEGATTSCHAR:"desc",1,7,1,0x2902
+BLEGATTSCHAR:"char",1,8,0xC307,0x02
+BLEGATTSCHAR:"desc",1,8,1,0x2901
+BLEGATTSCHAR:"char",2,1,0xC400,0x02
+BLEGATTSCHAR:"desc",2,1,1,0x2901
+BLEGATTSCHAR:"char",2,2,0xC401,0x02
+BLEGATTSCHAR:"desc",2,2,1,0x2901

OK
AT+BLEADVSTART

OK
+BLECONN:0,"f6:28:21:5d:94:1d"
AT+GMR
AT version:3.2.0.0(s-ec2dec2 - ESP32 - Jul 28 2023 07:05:28)
SDK version:v5.0.2-376-g24b9d38a24-dirty
compile time(6118fc22):Jul 28 2023 09:47:28
Bin version:v3.2.0.0(WROOM-32)

OK
AT+BLEGATTCRD=0,1,3,

ERROR
AT+BLEGATTCRD=0,1,3

ERROR


Next is the github link that has similar problems to mine.

https://github.com/espressif/esp-at/issues/460
https://github.com/espressif/esp-at/issues/484


What is the command to know what value written for UUID C302?

thank you.

Maybe you can refer to this document. The attribute value 0xC302 is 0x08, representing WRITE Permission, which cannot be read.