Modify OTA in 8266 core

gerrond · December 26, 2021, 1:47pm

Is it possible to add function to OTA end in ESP8266 core (such as EPROM write) or switch to using in explicit program functions instead of those in core.

I apologise if this question seems rather naive; I am rather naive.

maxgerhardt · December 26, 2021, 2:01pm

The Arduino-ESP8266’s OTA library supports that you give it an “end function” that will be called when OTA is finished. (Callbacks for other events such as ‘progress’, ‘start’, exist too)

github.com

esp8266/Arduino/blob/master/libraries/ArduinoOTA/ArduinoOTA.h#L53-L54


      
          //This callback will be called when OTA has finished
          void onEnd(THandlerFunction fn);

Example can be seen per:

github.com

esp8266/Arduino/blob/b5f3d1d6d57281642f3e034a215146da61b0771e/libraries/ArduinoOTA/examples/OTALeds/OTALeds.ino#L55-L60


      
          ArduinoOTA.onEnd([]() { // do a fancy thing with our board led at end
            for (int i = 0; i < 30; i++) {
              analogWrite(led_pin, (i * 100) % 1001);
              delay(50);
            }
          });

The example above uses a C++ lambda function to implement the callback, but you can give it the name of any function with the signature void someFunction() (source) too.

gerrond · December 26, 2021, 2:22pm

Hi

Thanks for that. I actually did know that (and have been putting such such calls-back in my code since I first used OTA for amongst other things turning my “heartbeat” LED from blue to red during OTA) but for some unknown reason I had it in my head that such calls-back were now in the core and I had to subvert them. I have no idea why I thought that.