Serial conflict with BUILTIN_LED for generic ESP8866 about homie-esp8266 HOT 7 CLOSED

#include <Homie.h>

void onHomieEvent(HomieEvent event) {
  switch(event) {
    case HOMIE_CONFIGURATION_MODE:
      // Do whatever you want when configuration mode is started
      break;
    case HOMIE_NORMAL_MODE:
       // Do whatever you want when normal mode is started
      break;
    case HOMIE_OTA_MODE:
       // Do whatever you want when OTA mode is started
      break;
    case HOMIE_ABOUT_TO_RESET:
      // Do whatever you want when the device is about to reset
      break;
    case HOMIE_WIFI_CONNECTED:
       // Do whatever you want when Wi-Fi is connected in normal mode
      break;
    case HOMIE_WIFI_DISCONNECTED:
      // Do whatever you want when Wi-Fi is disconnected in normal mode
      break;
    case HOMIE_MQTT_CONNECTED:
      // Do whatever you want when MQTT is connected in normal mode
      break;
    case HOMIE_MQTT_DISCONNECTED:
      // Do whatever you want when MQTT is disconnected in normal mode
      break;
  }
}

void setup() {
  Homie.enableBuiltinLedIndicator(false);
  Homie.onEvent(onHomieEvent);
}

#include <Homie.h>
#include <Ticker.h>

Ticker led_ticker;

void blinkTick() {
  digitalWrite(CUSTOM_LED, !digitalRead(CUSTOM_LED));
}

void blink(bool start) {
  if (start) {
    digitalWrite(CUSTOM_LED, HIGH);
    led_ticker.attach(1000, blinkTick);
  } else {
    led_ticker.detach();
    digitalWrite(CUSTOM_LED, LOW);
  }
}

void onHomieEvent(HomieEvent event) {
  switch(event) {
    case HOMIE_WIFI_CONNECTED:
      blink(true);
      break;
    case HOMIE_WIFI_DISCONNECTED:
      blink(false);
      break;
  }
}

void setup() {
  Homie.enableBuiltinLedIndicator(false);
  Homie.onEvent(onHomieEvent);
}