Add dynamically data to node configuration

[edoardottt]

ok, now it's better, but I have still some questions...

• How can I set a list of options if I have data?
  There it's used a text field and I can't use a text field

• I have the data in the js file, can I use simply this to define an API endpoint?
  Maybe it isn't clear when you say 'You can't just put /'

RED.httpAdmin.get("/devices", function(req,res) {
        devices.list(function (err, devices) {
            res.json(devices);
        });
    });