Failure

main.cpp

#include "main.h"

void config_read() {
  // configFile = SPIFFS.open("/config.json", "w+");
  size_t size = configFile.size();
  std::unique_ptr<char[]> buf(new char[size]);
  DynamicJsonBuffer jsonBuffer;
  configFile.readBytes(buf.get(), size);
  JsonObject& json = jsonBuffer.parseObject(buf.get());
  const char* brightness = json["brightness"];
  Serial.print("Level: ");
  Serial.println(brightness);
}

void config_write() {
  // configFile = SPIFFS.open("/config.json", "w");
  DynamicJsonBuffer jsonBuffer;
  JsonObject& json = jsonBuffer.createObject();
  json["brightness"] = "brightnessQ";
  json.printTo(configFile);
}


void setup() {
  Serial.begin(115200);
  Serial.setDebugOutput(true);
  // ArduinoOTA.begin();
  if (!SPIFFS.begin()) { Serial.println("Failed to mount file system"); }
  //delay(1000);
  configFile = SPIFFS.open("/config.json", "r+");

  if (!configFile) {
     configFile = SPIFFS.open("/config.json", "w+");
  }
  config_write();
  config_read();
}

void loop() {}