Nice job! Have you tested it also on other boards? I'll need to update Kolka to make it run correctly 😅

I do have only ESP01 here but the firmware does not fit the flash. Need to disable ArduinoOTA and WebServer first.

By the way, using the {fmt} library allows achieving ~40KH/s on this board. Let me make another PR...

While you're on it, could you check if maybe similar thing isn't happening in the ESP32 code? I believe it could go even faster if 8266 is capable of doing these numbers now.

Surely will check ESP32 next.

Added another commit with {fmt}. It will require https://github.com/fmtlib/fmt as a dependency

The ESP32 code seems to use hash conversion outside of the loop and memcmp already.

The ESP32 code seems to use hash conversion outside of the loop and memcmp already.

What about using fmt on the esp32?

It clearly makes sense :)

You missed { in this part of the code:

Also, I tested the code on my Nodemcu esp8266 v2 (Amida)
And my hashrate changed from ~10KH/s to ~9.7KH/s

Edit: sometimes it changes from 10KH/s to 30KH/s but something is weird here lol.

Right, fixed the missing bracket.

Almost all the users use the Arduino IDE, if you can't provide a easy, IDE native way to add the fmt library, maybe is best to remove it...

Indeed, the fmt may be a bit too much, but the rest looks like it can be added for the future version.

Good point. I'm not using Arduino IDE at all. How do people add the dependencies there, ArduinoJSON for example?

Tools > Manage Libraries > search.

There is a centralized directory of Arduino IDE ready libraries, another option is making the library code available on the libraries folder.. i.e. for me, on Windows, is on Documents\Arduino\libraries

Look at this, for an example of a library that can be dropped into that folder: https://github.com/me-no-dev/ESPAsyncWebServer

See the library.json and library.properties files

On PlatformIO I just add the dependency in the .ini file - https://registry.platformio.org/libraries/fmtlib/fmt/installation and it is stored in a code. Arduino IDE creates to much hassle :( Okay, I'm fine to remove fmt then.

I get an average of 25.38 kH/s, with peaks of 29.51kH/s. And OTA, webserver works on ESP-01S (1 meg of flash)

Kolka is not happy 😁 (ignore the share number, had a few unrelated restarts)

...
BAD,Incorrect difficulty share #3 (2991) hashrate: 29.14 kH/s (0.10s)
...
BAD,Incorrect difficulty share #4 (33667) hashrate: 26.85 kH/s (1.25s)
...
BAD,Incorrect difficulty share #1 (66999) hashrate: 23.78 kH/s (2.82s)
BAD,Incorrect difficulty share #2 (37063) hashrate: 26.38 kH/s (1.41s)
...

the difficulty change is very random... might revert back to 3.18 code to avoid getting flagged

I've just tested with ESP-01 (512K flash) and fmt, the results are quite the same as ESP-12e:

BAD,Incorrect difficulty share #1 (5061) hashrate: 42.33 kH/s (0.12s)
BAD,Incorrect difficulty share #2 (89078) hashrate: 40.86 kH/s (2.18s)
GOOD share #3 (3300134) hashrate: 38.35 kH/s (86.04s)
GOOD share #4 (67040) hashrate: 41.03 kH/s (1.63s)
GOOD share #5 (374274) hashrate: 39.98 kH/s (9.36s)
GOOD share #6 (337099) hashrate: 40.02 kH/s (8.42s)
GOOD share #7 (391612) hashrate: 39.96 kH/s (9.80s)

Could it be that PlatformIO gives some better optimizations over Arduino IDE?

could be, likely has an updated gcc, but even details as the version of the nonos-sdk version ( 2.2.1+119 ), and/or using a higher bandwidth version of the LwIP stack can affect things... for me sometimes can be the difference between a 8.5kH/s and a 10.1 kH/s average on the regular code.

Maybe there's an easier way to add {fmt}, if you have that code in a different branch in your repo, I can try this:

To use the {fmt} library, add fmt/core.h, fmt/format.h, fmt/format-inl.h, src/format.cc and optionally other headers from a release archive or the Git repository to your project.

I am using ESP8266, and I just flashed them, loaded the code in Arduino, and it worked immediately, maybe the error was corrected by the time I downloaded the code. I get between 35KH - 37KH.

You missed { in this part of the code:

Also, I tested the code on my Nodemcu esp8266 v2 (Amida) And my hashrate changed from ~10KH/s to ~9.7KH/s

Edit: sometimes it changes from 10KH/s to 30KH/s but something is weird here lol.