esphome/tests/custom.h

#include "esphome.h"

class CustomSensor : public Component, public Sensor {
 public:
  void loop() override {
    publish_state(42.0);
  }
};

class CustomTextSensor : public Component, public TextSensor {
 public:
  void loop() override {
    publish_state("Hello World");
  }
};

class CustomBinarySensor : public Component, public BinarySensor {
 public:
  void loop() override {
    publish_state(false);
  }
};

class CustomSwitch : public Switch {
 protected:
  void write_state(bool state) override {
    ESP_LOGD("custom_switch", "Setting %s", ONOFF(state));
  }
};

class CustomComponent : public PollingComponent {
 public:
  void setup() override {
    ESP_LOGD("custom_component", "Setup");
  }
  void update() override {
    ESP_LOGD("custom_component", "Update");
  }
};