ESP32 stack error when reading from BLE device

Question

I'm using this code here to read data from a BLE thermometer using an ESP32.

The code sometimes works fine and i can get the data:

+ Connect : a4:c1:38:69:0c:ff
 * Connected a4:c1:38:69:0c:ff
 + Found our service
 + Found our characteristic
 + Notify callback for characteristic ebe0ccc1-7a0a-4b0c-8a1a-6ff2997da3a6
temp = 21.8 C ; humidity = 48.0 % ; voltage = 2.564 V
 * Disconnected a4:c1:38:69:0c:ff

Other times i get a CPU panic, related to a stack error:

+ Connect : a4:c1:38:69:0c:ff
 * Connected a4:c1:38:69:0c:ff
 + Found our service
 + Found our characteristic
 + Notify callback for characteristic ebe0ccc1-7a0a-4b0c-8a1a-6ff2997da3a6
temp = 21.8 C ; humidity = 47.0 % ; voltage = 2.564 V
Guru Meditation Error: Core 0 panic'ed (Unhandled debug exception)
Debug exception reason: Stack canary watchpoint triggered (btuT) 
Core 0 register dump:
PC : 0x4000c472 PS : 0x00060a36 A0 : 0x8012b791 A1 : 0x3ffcf7e0 
A2 : 0x3ffcf7f4 A3 : 0x00000000 A4 : 0x00000268 A5 : 0x3ffcfa14 
A6 : 0x3ffde1ad A7 : 0x00000026 A8 : 0x8012987e A9 : 0x3ffd0270 
A10 : 0x3ffdb99c A11 : 0x3ffddca8 A12 : 0x3ffd050a A13 : 0x00000001 
A14 : 0x00000004 A15 : 0x00000000 SAR : 0x00000010 EXCCAUSE: 0x00000001 
EXCVADDR: 0x00000000 LBEG : 0x4000c46c LEND : 0x4000c477 LCOUNT : 0x00000003 
ELF file SHA256: 0000000000000000
Backtrace: 0x4000c472:0x3ffcf7e0 0x4012b78e:0x3ffcf7f0 0x40129815:0x3ffcfa80 0x40125e62:0x3ffcfd10 0x401286e8:0x3ffcfd30 0x4012987b:0x3ffcffc0 0x40125e62:0x3ffd0250 0x401286e8:0x3ffd0270 0x4012987b:0x3ffd0500 0x40125e62:0x3ffd0790 0x401286e8:0x3ffd07b0 0x4012940a:0x3ffd0a40 0x40125e62:0x3ffd0a60 0x40129621:0x3ffd0a80 0x40125e62:0x3ffd0aa0 0x4012933d:0x3ffd0ac0 0x40129359:0x3ffd0ae0 0x40125e62:0x3ffd0b00 0x40125fa1:0x3ffd0b20 0x4012fb36:0x3ffd0b40 0x401042a6:0x3ffd0b60 0x4008ff9e:0x3ffd0b90
Rebooting...

I'm using an ESP-WROOM-32 with PlatformIO, what could be the issue?

• jsotola: the issue could be a software bug
• Dmytro Kadyrov: Same problem, but I fix it. Use lib github.com/h2zero/NimBLE-Arduino

Answer 1

To help others. I resolved this issue by using the ArduinoBLE lib instead of the ESP32_BLE one I was using.

• timemage: Usually we're looking for a little internal structure to answers rather than one-liners. So, if you have any useful details to add, that would be nice. But, otherwise if that resolved it cool. Welcome to ASE.