How to run NRF.setRSSIHandler function in a infinite loop with a wait time?

as for the rssi handler to be called 10 times and compute average I'd do something like

  var rssicnt=0;
  var sum=0;
  NRF.setRSSIHandler((data)=>{
    sum+=data;
    print(rssicnt,"rssi=",data);
    if(++rssicnt > 9) {
      NRF.setRSSIHandler();
      print("avg rssi=",sum/10);
    }
  });

to do this every 5 seconds you just put it into setIterval

setInterval(()=>{
  var rssicnt=0;
  var sum=0;
  NRF.setRSSIHandler((data)=>{
    sum+=data;
    print(rssicnt,"rssi=",data);
    if(++rssicnt > 9) {
      NRF.setRSSIHandler();print("avg rssi=",sum/10);
    }
  });
},5000);