Multiple services/characteristics with the same UUID

As I understood it, you weren't really meant to do:

1815
  2A56
  2A56

But instead might have different services that contained the same characteristic:

1815
  2A56
1816
  2A56

However I could well be wrong - is your example something that people are actually doing?

As you noted, in Espruino it's not easy to do. One solution is to alternate between using Strings and Integers:

NRF.setServices({
  0x1815: { // automation
    0x2A56: { // digital
      readable: true,
      value : 1,
    },
    "0x2A56" { // digital --> gets ignored as it's a duplicate key
      readable: true,
      value: 0
    },
   // could use `"0x2a56"` and `2A56` as well in this case...
  }
});

However it is a bit of a hack! It'll also be virtually impossible to then change the value with NRF.updateServices at a later date as well.