My current SW compiles o.k. but during startup of the µC I receive strange messages (in yellow): 0x40080000: _WindowOverflow4 at E:/msys32/opt/esp/esp-idf/components/freertos/xtensa_vectors.S:1685 and 0x400d0018: _flash_cache_start at ??:? and 0x4008bfa4: bb_init at ??:? Do I need to worry about the...

now I fixed my problem: it was related to a race condition between incoming and outgoing telegrams. Now btStack works. Unfortunately even after tuning everything the the BT communication is much slower than the direct serial communication (approx. factor 2).
@loboris: Thanks for your support.

now I also changed hci_dump.c and now there is no logging any more. But my problem remains the same: the communication is too slow. Can you check how fast you can exchange data?

using esp_log_level_set("[BT_STACK]", 3); you can only switch off logging of the esp-idf functions. The btstack still logs many data: I (114548) PacketHandler: spp_send_packet() D (114549) SendPacket: begin [00:01:54.549] ACL => 80 00 19 00 15 00 41 00 09 EF 20 00 41 02 30 30 30 31 32 3 0 35 36 2E 3...

I am currently trying to make btstack work. I am having some issues:
- how to switch off logging (in oder to increase speed)?
- sometimes the communication gets stuck for a few seconds; why?
- do you have some sample code?

I am also still waiting for the support of the SPP profile in esp-idf. Recently they published the ble_spp_server example but this does not help me because I need the real BT classic SPP profile. I found this ( https://github.com/bluekitchen/btstack/tree/master/port/esp32 ) solution, but unfortunate...

@linuxpaul: I received Your PN. For sure there is some interesting stuff included.
Concerning my problem with the limitation to 8.3 filenames: this could be solved via menuconfig by activating long filenames. Now I am able to access index.shtml including SSI calls.
Best regards

Intetrsting point. Iwill try and post the result.

probably a stupid question: is it possible to use SPIFFS in combination with a real SDcard?
I would like to use SSI and therefore the filename needs to be .shtml; so FAT with 8.3 is a problem.

Thank You, linuxpaul. Now I am also able to compile the sources. I think finally I just needed to include the defines (-D switches) in Eclipse under: C/C++General / Paths and Symbols / Symbols. My webserver is working now, but I discovered that obviously the esp fat driver supports 8.3 filenames onl...