ESP8266 firmware supports UART hardware flow control by default.
In order to enable hardware flow control, your ESP8266 hardware module need to support that, too.
If you are using a demo board which bought from Espressif, please connect J63 to enable hardware flow control.
Also we need to use a UART tool which support hardware flow control, for example, "SecureCRT ", select the RTS/CTS as picture below.
I hope this is helpful, thanks for your interest in ESP8266!
透传丢数据，是由于没有硬件流控。
软件默认是支持硬件流控的，需要您硬件板子同样也支持硬件流控
如果使用的是从乐鑫购得的 demo 板，请将 J63 跳线接上即可。
同样，串口工具，例如 SecureCRT 也需要设置为硬件流控，勾选附件红框所示的位置即可。
另外，退出透传需要一次性收到“+++”，没有其他多余字符，只要串口工具能做到这个，并不限制使用哪个串口工具。
希望这个帖子能帮到大家。
