BLE OTA failed

[ericlangel]

Hello,

i'am using your ESP32 BLE OTA Project since the very first release.

With the Android App everything is working fine.
But with the BLE Web OTA it doesnt work:

14:25:18.438 -> Written : 710640 successfully
14:25:18.747 -> E (512140) esp_image: Checksum failed. Calculated 0xbc read 0x0
14:25:18.747 -> Error Occurred. Error #: 9
14:25:18.781 -> �Written : 710640/710640 [100%]
14:25:18.781 -> Error #: 9

i have to check both images, but it seems there is an error with the BLE Web OTA

any ideas?

[ericlangel]

the files are different:
original:

and received and stored by ESP32:

looks like the last 140 Bytes are wrong/empty
Problem with the last BLE Packet?

File size is correct

[ericlangel]

i added some Debug prints in Arduino Code and found the issue in 0xFB Command

08:59:27.172 -> Length: 502 -> 0xFB Position: 0
08:59:27.172 -> Length: 502 -> 0xFB Position: 1
08:59:27.172 -> Length: 502 -> 0xFB Position: 2
08:59:27.172 -> Length: 502 -> 0xFB Position: 3
08:59:27.172 -> Length: 502 -> 0xFB Position: 4
08:59:27.206 -> Length: 502 -> 0xFB Position: 5
08:59:27.206 -> Length: 502 -> 0xFB Position: 6
08:59:27.206 -> Length: 502 -> 0xFB Position: 7
08:59:27.206 -> Length: 502 -> 0xFB Position: 8
08:59:27.240 -> Length: 502 -> 0xFB Position: 9
08:59:27.240 -> Length: 502 -> 0xFB Position: 10
08:59:27.240 -> Length: 502 -> 0xFB Position: 11
08:59:27.273 -> Length: 502 -> 0xFB Position: 12
08:59:27.273 -> Length: 502 -> 0xFB Position: 13
08:59:27.273 -> Length: 142 -> 0xFB Position: 13
08:59:27.273 -> Length: 5 -> 0xFC WriteLen: 6640

The last 140 Bytes have the wrong Position.
It should be 14!

[ericlangel]

Quick&Dirty fix in 0xFB Command:

if(pos == pos_old){
pos++;
}
pos_old = pos;