WLED/usermods/EXAMPLE_v2/usermod_v2_example.h

#pragma once

#include "wled.h"

/*
 * Usermods allow you to add own functionality to WLED more easily
 * See: https://github.com/Aircoookie/WLED/wiki/Add-own-functionality
 * 
 * This is an example for a v2 usermod.
 * v2 usermods are class inheritance based and can (but don't have to) implement more functions, each of them is shown in this example.
 * Multiple v2 usermods can be added to one compilation easily.
 * 
 * Creating a usermod:
 * This file serves as an example. If you want to create a usermod, it is recommended to use usermod_v2_empty.h from the usermods folder as a template.
 * Please remember to rename the class and file to a descriptive name.
 * You may also use multiple .h and .cpp files.
 * 
 * Using a usermod:
 * 1. Copy the usermod into the sketch folder (same folder as wled00.ino)
 * 2. Register the usermod by adding #include "usermod_filename.h" in the top and registerUsermod(new MyUsermodClass()) in the bottom of usermods_list.cpp
 */

//class name. Use something descriptive and leave the ": public Usermod" part :)
class MyExampleUsermod : public Usermod {
  private:
    //Private class members. You can declare variables and functions only accessible to your usermod here
    unsigned long lastTime = 0;
  public:
    //Functions called by WLED

    /*
     * setup() is called once at boot. WiFi is not yet connected at this point.
     * You can use it to initialize variables, sensors or similar.
     */
    void setup() {
      //Serial.println("Hello from my usermod!");
    }


    /*
     * connected() is called every time the WiFi is (re)connected
     * Use it to initialize network interfaces
     */
    void connected() {
      //Serial.println("Connected to WiFi!");
    }


    /*
     * loop() is called continuously. Here you can check for events, read sensors, etc.
     * 
     * Tips:
     * 1. You can use "if (WLED_CONNECTED)" to check for a successful network connection.
     *    Additionally, "if (WLED_MQTT_CONNECTED)" is available to check for a connection to an MQTT broker.
     * 
     * 2. Try to avoid using the delay() function. NEVER use delays longer than 10 milliseconds.
     *    Instead, use a timer check as shown here.
     */
    void loop() {
      if (millis() - lastTime > 1000) {
        //Serial.println("I'm alive!");
        lastTime = millis();
      }
    }


    /*
     * addToJsonInfo() can be used to add custom entries to the /json/info part of the JSON API.
     * Creating an "u" object allows you to add custom key/value pairs to the Info section of the WLED web UI.
     * Below it is shown how this could be used for e.g. a light sensor
     */
    /*
    void addToJsonInfo(JsonObject& root)
    {
      int reading = 20;
      //this code adds "u":{"Light":[20," lux"]} to the info object
      JsonObject user = root["u"];
      if (user.isNull()) user = root.createNestedObject("u");

      JsonArray lightArr = user.createNestedArray("Light"); //name
      lightArr.add(reading); //value
      lightArr.add(" lux"); //unit
    }
    */


    /*
     * addToJsonState() can be used to add custom entries to the /json/state part of the JSON API (state object).
     * Values in the state object may be modified by connected clients
     */
    void addToJsonState(JsonObject& root)
    {
      //root["user0"] = userVar0;
    }


    /*
     * readFromJsonState() can be used to receive data clients send to the /json/state part of the JSON API (state object).
     * Values in the state object may be modified by connected clients
     */
    void readFromJsonState(JsonObject& root)
    {
      userVar0 = root["user0"] | userVar0; //if "user0" key exists in JSON, update, else keep old value
      //if (root["bri"] == 255) Serial.println(F("Don't burn down your garage!"));
    }


    /*
     * addToConfig() can be used to add custom persistent settings to the cfg.json file in the "um" (usermod) object.
     * It will be called by WLED when settings are actually saved (for example, LED settings are saved)
     * If you want to force saving the current state, use serializeConfig() in your loop().
     * 
     * CAUTION: serializeConfig() will initiate a filesystem write operation.
     * It might cause the LEDs to stutter and will cause flash wear if called too often.
     * Use it sparingly and always in the loop, never in network callbacks!
     * 
     * addToConfig() will also not yet add your setting to one of the settings pages automatically.
     * To make that work you still have to add the setting to the HTML, xml.cpp and set.cpp manually.
     * 
     * I highly recommend checking out the basics of ArduinoJson serialization and deserialization in order to use custom settings!
     */
    void addToConfig(JsonObject& root)
    {
      JsonObject top = root.createNestedObject("exampleUsermod");
      top["great"] = userVar0; //save this var persistently whenever settings are saved
    }


    /*
     * readFromConfig() can be used to read back the custom settings you added with addToConfig().
     * This is called by WLED when settings are loaded (currently this only happens once immediately after boot)
     * 
     * readFromConfig() is called BEFORE setup(). This means you can use your persistent values in setup() (e.g. pin assignments, buffer sizes),
     * but also that if you want to write persistent values to a dynamic buffer, you'd need to allocate it here instead of in setup.
     * If you don't know what that is, don't fret. It most likely doesn't affect your use case :)
     * 
     * Return true in case your config was complete, or false if you'd like WLED to save your defaults to disk
     * 
     * This function is guaranteed to be called on boot, but could also be called every time settings are updated
     */
    bool readFromConfig(JsonObject& root)
    {
      userVar0 = 42; //set your variables to their boot default value (this can also be done when declaring the variable)

      JsonObject top = root["exampleUsermod"];
      if (!top.isNull()) {
        bool configComplete = true;

        //check if value is there
        if (top.containsKey("great")) {
          //convert value to the correct type
          userVar0 = top["great"].as<int>(); 
        } else configComplete = false;

        if (configComplete) return true;
      }
      return false;
    }

   
    /*
     * getId() allows you to optionally give your V2 usermod an unique ID (please define it in const.h!).
     * This could be used in the future for the system to determine whether your usermod is installed.
     */
    uint16_t getId()
    {
      return USERMOD_ID_EXAMPLE;
    }

   //More methods can be added in the future, this example will then be extended.
   //Your usermod will remain compatible as it does not need to implement all methods from the Usermod base class!
};