NRF.setScan() stops working

Ok, if you put a cutting edge firmware on there, you can now do:

NRF.requestDevice({filters:[{id:"xx:xx:xx:xx:xx:xx random"}]}).then(function(dev) {
  if (dev.manufacturerData)
    print("State is "+dev.manufacturerData[0]);
})

or:

NRF.requestDevice({filters:[{manufacturerData:{0x0590:{}}}]}).then(function(dev) {
    print("State is "+dev.manufacturerData[0]);
})

or even the following, which will use setScan, but with filters to quickly filter out anything you're not interested in:

NRF.setScan(function(dev) {
    print("State is "+dev.manufacturerData[0]);
}, {filters:[{manufacturerData:{0x0590:{}}}]});