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FreeFi232 is a WiFi modem that connects to an RS232 level serial port. It is a combination of open source hardware, based around the ESP-12 wifi module, and open source firmware, built on Jussi Salin's ESP8266 virtual modem - https://github.com/jsalin/esp8266_modem.

The firmware provides a Hayes-like command set which can be used to connect terminal software to telnet and http services across a TCP/IP network. It currently supports speeds from 300bps to 115200bps with or without hardware (RTS/CTS) flow control.

The hardware provides for sending and receiving a fairly complete set of RS232 signals over a 25pin d-sub connector:

• RXD
• TXD
• RTS
• CTS
• DSR
• DTR
• DCD
• RING