My problems seem to have been fixed by assuring a content-length is supplied in the HTTP header.

Cannot reproduce in station mode on v4.0-beta1.

Problem is perhaps that the web server does not give a content-length so when the transfer is interrupted prematurely the OTA process does not know it does not have all data?

Tested again twice witout making any changes, updating locally. First time succeeded although a bit slow due to being in debug mode.

Second time:

D (53223) esp_https_ota: Written image length 5202
D (53223) HTTP_CLIENT: is_data_remain=1, is_chunked=1, content_length=-1
D (53223) HTTP_CLIENT: need ...

There were a lot of aes headers, but I didn't find a suitable one, so I ran with TinyAES and did it manually.

I have some trouble following the example due to our setup; only HTTP, but I can try putting the image on a known good server.

As RPA support seems to be missing from the controller:

https://github.com/espressif/esp-idf/blob/master/components/bt/host/bluedroid/stack/btm/btm_ble_bgconn.c#L202

Is it possible to decode a Resolvable Random Device Address with the functions available in the IDF?

I need to identify the ...

+1 on toolchain 8.2.0 and IDF v4.0 beta1

I (46791) esp_https_ota: Starting OTA...
I (46791) esp_https_ota: Writing to partition subtype 17 at offset 0x200000
I (61701) esp_https_ota: Connection closed, all data received
I (61701) esp_image: segment 0: paddr=0x00200020 vaddr=0x3f400020 size=0x2f6b0 ...

OK, thanks! For now I can work around it and do flash monitor and get the automatic rebuild when I quit the monitor.

How do you remote debug with the 2.0 toolchain? What has changed in gdb since old version?

I used
msys32\opt\xtensa-esp32-elf\bin\xtensa-esp32-elf-gdb.exe
before, but the new
.espressif\tools\xtensa-esp32-elf\esp32-2019r1-8.2.0\xtensa-esp32-elf\bin\xtensa-esp32-elf-gdb.exe
does not seem to be ...

Updated from
v4.0-dev-1287-gd7e659df2
to
v4.1-dev-141-ga7e8d87d3-dirty

idf.py now executes flash before all :

idf.py -p com29 -b 921600 all flash monitor
Checking Python dependencies...
Python requirements from C:\esp-idf\requirements.txt are satisfied.
Executing action: flash

Addendum ...