Send keyboard keycode 219

Hi,

I think you'd definitely need to use ble_hid_keyboard and not ble_hid_controls, but otherwise what you're doing seems ok (although .tap should still work for you).

I think the problem you might be hitting is the HID report specifies a maximum value of 115:

http://www.espruino.com/modules/ble_hid_keyboard.js

0x25, 0x73,       // Logical Maximum (115 - include F13, etc)
...
0x29, 0x73,       // Usage Maximum (115 - include F13, etc)

You could try using your own HID report based on that one, but with just those numbers made bigger?