Puck.js to detect another rssi presence

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Gordon
Yes, absolutely. The easiest thing to do is to use NRF.requestDevice: http://www.espruino.com/Reference#l_NRF_requestDevice
```
NRF.requestDevice({ timeout:500,  filters: [{ namePrefix: 'Puck.js' }] }).then(function(device) { 
  ...device.rssi...
}).catch(function() {
 // device not in range
});
```
In the example above I added a timeout of 0.5 sec (the default is 2). When Scanning the device uses quite a lot of power compared to normal, so really you want to scan as rarely and for as short a period as possible (unless you're not battery powered of course).

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