Unholy combination of Arduino and ESP-IDF to create a primitive network-attached UART.

Features:

• Online reconfiguration
• Standard Port 23 for pure serial communications
• Configuration Port for changing parameters

I use a NodeMCU 32S, but it doesn't really matter, which ESP32 board you use. You can use any ESP32 based hardware with the following pinout:

• TCP Port 23
• Only a single connection at a time.
• Everything sent is transmitted via the UART.
• Everything received via the UART is sent back to the host.

• TCP Port 1337
• Only a single connection at a time.
• Line based protocol, accepts both CR and LF as command separator.
• Syntax is key=value
• Query the value by passing key=?
• Legal keys are:
  • baud, takes an integer, current baud rate
  • mode, takes a mode descriptor in the form of 8n1 (databits, parity, stop bits)
    • databits from 5 to 8
    • parity is e (even), o (odd), n (none)
    • stop bits is 1 or 2

Get PlatformIO and do:

[user@host] ~/wireless-uart$ pio run 
…
[user@host] ~/wireless-uart$