I will make a separate project page for this little device, but for now I'll give another update.

I've added a 20x4 LCD off of the ESP8266 via I2C, anything coming through the UART to the telnet session within brackets will display on the LCD. This allows for succinct messages to be displayed with ease from attached devices.

The initialization screen of the wifi serial bridge...

The option to configure settings such as UART rate, SSID etc. By connecting via telnet and typing "start" the defaults are loaded from EEPROM and applied.

Once started we get a little message saying we are good to go. I now start the flight computer...

We can now intact with the flight computer, sending commands and receiving data. Anything sent back in the serial stream inside brackets gets displayed on the LCD.

For instance, after typing "ma" for maximum altitude request, the LCD gives us the altitude.

Overall I'm very happy. Like I said I'll make a dedicated Hackaday.io project for the wifi serial bridge here soon to keep all the details in one place. I'll be putting it into a project enclosure here before too long also.

Other peripherals such as my thrust measurement stand will be able to interact with the LCD also. Very cool. It will be a useful device. Now any microcontroller with a serial link I can connect an APC220 to and get a remote telnet session and LCD on without any hassle.