请问这段代码是什么意思呢?
void button1_callback(const String & state) {BLINKER_LOG2("get button state: ", state);
digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
https://doc.blinker.app/?file=002-%E5%BC%80%E5%8F%91%E5%85%A5%E9%97%A8/002-Arduino%E5%BC%80%E5%8F%91%E5%85%A5%E9%97%A8 回调函数,执行结果是取反LED_BUILTIN
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