Teensy program to keep your computer awake (and therefore your VPN). Compile with Tools->USB->Keyboard.

keypuncher.ino

int count = 0;
void setup() { }
void loop() {
    int i;
    Keyboard.print("Hello World ");
    Keyboard.print(count);
    count = count + 1;
    delay(2000);
    for (i = 0; i < 20; i++) {
        Keyboard.print("\177");
        delay(200);
    }
}