Espressif Systems ESP8266EX - Pass-Through Connection; Uart Frames

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Espressif
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ESP8266EX Beginner’s Guide
2.2. Pass-through Connection
Pass-through here refers to the transparent transmission function. Host data is transmitted
to ESP8266EX through uart and ESP8266EX the transmits the data over the wireless
network, and vice versa. ESP8266 receives data over a wireless network, empathy spread
through uart Host. ESP8266 is only responsible for the data transmitted to the destination
and it does not process the data in any way. The transmission process is as if it is
transparent.
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2.3. UART Frames
ESP8266EX can estimate the interval between receiving UART data. If the interval is
greater than 20ms, it is considered the end of one transmission packet. Otherwise, it will
receive data to the upper limit of 2KB, and consider an end. When the ESP8266 module
thinks that the UART data has reached the end of a frame, it will forward the data via Wi-
Fi. Frame time interval is 20ms with a size limit of 2KB.
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Parameters needed to establish a pass-through connection:
Wireless network parameters
Network Name (SSID)
Encryption
Key (password)
TCP connection parameters
Protocol type
Connection type (client)
Destination IP Address
Destination port
Serial port parameters
Baud Rate
Data bits
Check digit
Stop bits
Hardware flow control
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