In the case of high baud rate has better transmission stability DRIVER: UB to CDC serial port: http://www.wch.cn/downloads/file/313.html?time=2021-07-01%2016:32:28&code=IeZQOsvk2MelEZnd9fXGO8KgK7VFOi2u2zvSM6lK USB to high-speed serial port: http://www.wch.cn/downloads/file/315.html?time=2021-07-01%2016:33:00&code=z6SUOEShBdvEKDUb5BAY6pxGVLSS9lSCVpUOxLPe  V2.1 version uses a new version of the driver IC,  If you cannot download the driver, please contact the seller to send it to the mailbox for you ESP8266 CH9102X 1.Open-source 2.Interactive 3.Programmable 4.Low cost 5.Simple 6.Smart WI-FI enabled Ard--uino-like hardware IO Advanced API for hardware IO, which can dramatically reduce the redundant work for configuring and manipulating hardware. Code like ard--uino, but interactively in Lua script. Nodejs style network API Event-driven API for network applicaitons, which faciliates developers writing code running on a 5mm*5mm sized MCU in Nodejs style. Greatly speed up your IOT application developing process. Lowest cost WI-FI