puck.js - keyboard "taps" not always accurate/responsive

Great! That's really promising.

So the first code you posted (that looks good) doesn't work? You basically have to send [kb.MODIFY.GUI,0,kb.KEY.F12,0,0,0,0,0] twice?

In that case, could you just do:

      NRF.sendHIDReport([kb.MODIFY.GUI,0,kb.KE­Y.F12,0,0,0,0,0], function() {
        NRF.sendHIDReport([kb.MODIFY.GUI,0,kb.KE­Y.F12,0,0,0,0,0], function() {
          NRF.sendHIDReport([0,0,0,0,0,0,0,0], function() {
           console.log("keys sent");
          });
        });
      });

You could also try:

      NRF.sendHIDReport([kb.MODIFY.GUI,0,0,0,0­,0,0,0], function() {
        NRF.sendHIDReport([kb.MODIFY.GUI,0,kb.KE­Y.F12,0,0,0,0,0], function() {
          NRF.sendHIDReport([kb.MODIFY.GUI,0,0,0,0­,0,0,0], function() {
            NRF.sendHIDReport([0,0,0,0,0,0,0,0], function() {
              console.log("keys sent");
            });
          });
        });
      });

so: press GUI, press F12, release F12, release GUI