ESP32 to mysql https://youyouyou.pixnet.net/blog/post/120275917-%E7%AC%AC%E5%8D%81%E4%B8%80%E7%AF%87-esp32-%E8%B3%87%E6%96%99%E5%BA%AB%E5%AD%98%E5%8F%96mysql%E9%80%A3%E7%B7%9A