This chrome app connects H-ITT devices with PINGO-system from uni paderborn.
The receiver will connected with PC/Mac of teacher. The plug is USB, but internal the protocol is serial. The communication on this line is hashed. The company offers a .so and a .dll, this libs decodes the binary on line. To use the receiver without the .dll/.so in JS world you have to patch the devices. After patching of device every click on handheld generats a short string with device number and keycode.