A sketch for the Digispark wich presses F1 evey 5 secs, to convince wired servers to boot.

f1.ino

#include "DigiKeyboard.h"
void setup() {
  // put your setup code here, to run once:
  pinMode(1, OUTPUT); //LED on Model A
  pinMode(5, INPUT);
  digitalWrite(1, HIGH);
  DigiKeyboard.delay(100);
  digitalWrite(1, LOW);
  DigiKeyboard.delay(1000);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(1, HIGH);
  DigiKeyboard.sendKeyStroke(KEY_F1);
  digitalWrite(1, LOW);
  DigiKeyboard.delay(5000);

}