Connect to a MI FlowerCare sensor

Im trying to connect to a MI FlowerCare sensor. Im having a issue thoe.

function getData() {
   var gatt;
   NRF.connect("C4:7C:8D:61:FB:E0").then(function(g) {
 gatt = g;
 return gatt.getPrimaryService("00001204-0000-1000-8000-00805f9b34fb");
 }).then(function(service) {
 return service.getCharacteristic("00001a01-0000-1000-8000-00805f9b34fb");
 }).then(function(characteristic) {
 return characteristic.readValue();
 }).then(function(value) {
 console.log(value);
 gatt.disconnect();
 console.log("Done!");
 }).catch(function(error){
 console.log("error", error);
 });
}

setWatch(function() {
 getData();
}, 
 BTN, { repeat:true, edge:"rising", debounce:50 });

I get error disconnected it seems that the flower sensor gets disconnected (I get error disconnected) :) in order to save battery there is a automatic disconnect after like 2 secs. Is there something I can do? Is my code correct ? I got the values using the gatttool on a raspberry Pi. I also found some clues here: https://github.com/open-homeautomation/miflora/blob/master/miflora/miflora_poller.py, Any sudgestions?