This simple WiFi serial port monitor would have saved us a lot of trouble. We can’t count how many times where being hooked into an Arduino with USB just to get the serial out has nearly been… ...

The "server" program is a sketch that lives on the Arduino board waiting for serial data to be available (an integer in this case) and sends back the number by adding 1 to it to the "client".

There’s a companion Java program (see video below) although you can use most of the features directly from the normal serial monitor, it just isn’t as pretty.