Connect to a MI FlowerCare sensor

@Wilberforce thank you very much for the help. With a little googling and some other tutorials about the sensor in python I finally had success.

This is the code I used to get the correct values.

var currentSevice = false;

    function getData() {
      var gatt;
      NRF.connect("C4:7C:8D:62:0D:5A").then(fu­nction(g) {
        gatt = g;
        return gatt.getPrimaryService("00001204-0000-10­00-8000-00805f9b34fb");
      })
      .then(function(service) {
        currentService = service;
        return service.getCharacteristic("00001a00-0000­-1000-8000-00805f9b34fb");
     })
     .then(function(characteristic) {
         return characteristic.writeValue([0xa0, 0x1f]);
     })
     .then(() => {
         return currentService.getCharacteristic("00001a­01-0000-1000-8000-00805f9b34fb");
     })
     .then((characteristic) => {
        return characteristic.readValue();
     })
     .then(function(value) {
        console.log("temperature: ", value.getI­nt16(0, true)/10);
   console.log("Sunlight: ",value.getInt­32(3,true));
   console.log("Moister: ", value.getUin­t8(7,true));
console.log("Fertility: ", value.getUint16(8,true));
        console.log(JSON.stringify(value.buffer)­);
       gatt.disconnect();
       console.log("Done!");
     })
       .catch(function(error){
         console.log("error", error);
       });
    }

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