Give the possibility to create custom endpoints

[apiel]

Would it be possible to define some custom endpoint. I was trying something like:

  adapter->server.on("/hello", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send(200, "text/plain", "Hello, world");
  });

but I am getting the following error: error: 'AsyncWebServer WebThingAdapter::server' is private

In my firmware, I am using an http server for multiple features, for example to to pair the device with Amazon Alexa or to trigger OTA updates. When I try to add webthing-arduino, it is conflicting. The best would be to be able to re-use the server instance from webthing-arduino.

[mrstegeman]

We actually have this capability in all of our other webthing libraries. However, it's difficult to do so with this one, since essentially each platform uses a different web server library. It's not straightforward to write an agnostic interface for adding new routes. We could make the server member public, I suppose, but that feels so unfinished.

[apiel]

Right now the only way I found is to create 2 servers. One for the webthings adapter on port 8080 and one using ESPAsyncWebServer on port 80. Would be amazing to be able to have both on port 80. Of course making server public could bring inconsistency if users overwrite some endpoints defined by webthings, but it would be an easy way to start...