BLE scan and advertising parallel?

@Gordon yes that off course fixed the issue i have ;-). I've changed my code over the day it works like aspactad.

let started = false;  // if scanning is startet
var intervalLed;
var selfid = NRF.getAddress().substr(12,5).replace(':',''); // get the last 5 digits of ble mac as id
var scanIds = [ "5c5b", "69f0", "6d31" ];  // list of devices to scan for
var data = new Uint8Array(scanIds.length); // define data as zero

// Default ble settings
const be = {
      name: "BLE "+ selfid, // The name of the device
      showName: true, // include full name, or nothing
      discoverable: true, // general discoverable, or limited - default is limited
      connectable: true, // whether device is connectable - default is true      
      scannable : true, // whether device can be scanned for scan response packets - default is true
      interval: 375, // Advertising interval in msec, between 20 and 10000 (default is 375ms)
      manufacturer: 0x0590, // IF sending manufacturer data, this is the manufacturer ID
    };

// update Advertising by the current received rssi
function updateAdvertising(device) {
  // our data - all 0 for nothing, 
  // or RSSI + 6 bytes address
  var id = device.id.substr(12, 5).replace(':','');

  if (!scanIds.includes(id)) return;

  data[scanIds.indexOf(id)] = device.rssi * -1; // converte to positive integer

  NRF.setAdvertising({}, {
    showName: false,
    connectable: false,
    scannable: false,
    interval: 100,
    manufacturer: be.manufacturer,
    manufacturerData: data
  });
  
  console.log("Found Device: " + id);
}

function setDefault() {
  // Initiale Advertising
  NRF.setAdvertising({}, {
    name: be.name,
    showName: be.showName,
    discoverable: be.discoverable,
    connactable: be.connectable,
    scannable: be.scannable,
    interval: be.interval,
    manufacturer: be.manufacturer,
    manufacturerData: data
  });
}

Pin.prototype.flash = function(period) { 
  var pin = this;
  digitalWrite(pin, true);
  setTimeout(function() {
    digitalWrite(pin, false);
  }, 100);
};

// Setting up defaults
setDefault();

// Watch if BTN was pressed
setWatch(function(){
  console.log("Device: " + be.name);
  
  if (started) {
    console.log("Stop Scanning");
    NRF.setScan();  // Stop scanning on BLE devices
    clearInterval(intervalLed); // Stop Led from blinking
    started = false; // switch device status
    LED1.flash(); // Show stop with red LED
    setDefault();
  } else {
    console.log("Start Scanning");
    started = true;
    LED2.flash();  // Show start with green LED
    NRF.setScan(updateAdvertising); // Start scanning for BLE devices
    intervalLed = setInterval('LED2.flash();', 10000); // Flash the green led to visualise scanning mode
  }
}, BTN, {edge:"rising", repeat:1, debounce:20});

Now i have two new problems. First of all, after starting and stopping, i can't connect to the Puck-js scince i'm pull out the battery and plug it in again.

~~The second problem is the advertising interval. If i change the interval to somthing under 100ms i don't reseive any packages from the device. ~~

[Edit] Answere for the second Question:
NOTE: Non-connectable advertising can't have an advertising interval less than 100ms according to the BLE spec.