fresh start with MDBT42Q , some specs before start toe code

first of all
thank you fir the help so far , you don't need to apologize :-)

this is what I have now :

1. created a device called "Test_Read_Write" - I can see it on BLE Scan
   
2. I have open "nRf" on by Android device and mange to connect to it .
   sending < 18 - led is on , > 18 led is off - so communication is working.
   

3. I'm trying to add update service , did I do it right ?
   I can see the data is changing when I send something to the device
   but is there a function I can call to update the value only after the data is change?
   and not print it once every 1000mSec (like I did)?
   it will be better no ?

   My_MAC = NRF.getAddress();
   
   print("My MAC address is " , My_MAC);
   var n = 0;
   
   NRF.setAdvertising({}, {name:"Test_Read_Write1"});
   
   NRF.setServices({
   "3e440001-f5bb-357d-719d-179272e4d4d9": {
   "3e440002-f5bb-357d-719d-179272e4d4d9": {
     writable : true,
     maxLen : 5,
     onWrite : function(evt) {
       n = evt.data[0];
       if (n < 18) {
   digitalWrite(LED, 1);
   }
      else {
      digitalWrite(LED, 0);}
   
     }
   },
   	"3e440003-f5bb-357d-719d-179272e4d4d9": {
     readable : true,
     notify: true,
     value : ["hello"]
   }
   }
   }, {});
   
   setInterval(function() {
   NRF.updateServices({
   "3e440001-f5bb-357d-719d-179272e4d4d9" : {
   "3e440003-f5bb-357d-719d-179272e4d4d9" : {
     value :  [n],
     notify: true
   }
   }
   }); }, 1000);
   
   // On disconnect, turn off led
   NRF.on('disconnect', function() {
   digitalWrite(LED, 0);
   });
   
   
   

when I upload the code I see this error :

BLE Connected, queueing BLE restart for later
Uncaught Error: Can't update services until BLE restart
 at line 37 col 2 in .bootcde

is this OK ? or does it mean I have a problem ?

***after I will see everything is working on with my phone , I will need your help with the python error of sending data

Thanks ,