Trying to understand BLE advertising

Ahh - yes, that's a bit unfortunate... The extra services are advertised in the scan response, which gets overwritten when you use that last bit of code.

The answer is yes, it is possible - but it's not very nice at the moment.

Basically you can supply an array to setAdvertising, which will cause it to cycle through different advertisements: https://www.espruino.com/Reference#l_NRF_setAdvertising

The problem is that you need to specify all the data as arrays - so what you're currently doing (giving it the object) won't work. You'd have to manually make up the advertising packet yourself (you could use something like nRF Connect to read the packet, then just enter the bytes manually?).

I hit this just a few days ago (I added the example code for iBeacon & setScanResponse literally just this week), but there wasn't a nice easy fix. I'll file an issue and will see if I can think of a nice way of getting around it... Maybe allowing something like this:

NRF.setAdvertising([
require("ble_ibeacon­").get({
    uuid : beaconUUID,    // iBeacon uuid
    major : beaconMajor,  // optional
    minor : beaconMinor,  // optional
    rssi : -59            // optional RSSI at 1 meter distance in dBm
  }),
{
    0x1815 : [button.single, button.long],
    0x180F : [metrics.battery],
    0x1809 : [metrics.temperature],
    0x181A : [metrics.light]
}],{ interval : 375 });