fresh start with MDBT42Q , some specs before start toe code

when I print to the OLED
E.getTemperature() - I get 24.5 , so it's OK
so if I will use this Characteristic for the temperature '2A6E' - will it show me ok on the nRF?
I have looked here
https://programmaticponderings.com/2020/­08/04/getting-started-with-bluetooth-low­-energy-ble-and-generic-attribute-profil­e-gatt-specification-for-iot/

and you can see in the nRf he is showing decimal value and say it's temp
https://programmaticponderings.files.wor­dpress.com/2020/08/screenshot_20200731-1­85558-5.png

I guess I will need to change the UUID also , no ?

Thanks ,

About my code

1. can I see the MAC of the remote device that connected?
   I want to print it on the OLED , for testing
   

2. I have wrote this code , it's seem to be working,
   my problem is when I disconnect:
   LED2 is off (as it should be)
   but on the OLED I still see "Connected" and the temp is changing every 5 seconds
   I guess it's because the Interval function that is still running
   can you see what I did wrong?

   My_MAC = NRF.getAddress();
   Relay_Pin = 22;
   
   print("My MAC address is " , My_MAC);
   var n = 0;
   
   
   function start(){
   // write some text
   g.setFontVector (20);
   g.drawString("David Test!",2,2);
   g.drawString("BLE ON",2,40);
   // write to the screen
   g.flip();
   }
   
   function BLE_Connect(){ 
   setInterval(function() {
   NRF.updateServices({
   "3e440001-f5bb-357d-719d-179272e4d4d9" : {
   "3e440008-f5bb-357d-719d-179272e4d4d9" : {
     value :  [E.getTemperature()],//to be able to see that read is correct
     notify: true
   }
   
   }
   });
   g.clear();
   g.setFontVector (20);
   g.drawString("Connected!",2,2);
   g.setFontVector (10);
   g.drawString("Temp is: " + E.getTemperature(), 1, 40);
   g.flip();
   }, 5000);
   
   }
   
   function BLE_Disconnect(){
   g.clear();
   g.setFontVector (20);
   g.drawString("Waiting!",2,2);
   g.flip();
   }
   
   var i2c = new I2C();
   i2c.setup({ scl : D20, sda: D19 });
   var g = require("SSD1306").connect(i2c, start);
   
   
   NRF.setAdvertising({}, {name:"OfficeTest"});
   
   NRF.setServices({
   "3e440001-f5bb-357d-719d-179272e4d4d9": {
   "3e440002-f5bb-357d-719d-179272e4d4d9": {
     description: "Setup Led",  // optional, default is null,
     writable : true,
     readable : true,
     notify: true,
     maxLen : 10,
     value : "Setup_Data",
     onWrite : function(evt) {
       data = evt.data[0];
       if (data < 18) {
           digitalWrite(LED, 1);
           digitalWrite(Relay_Pin, 1);
           }
      else {
      digitalWrite(LED, 0);
      digitalWrite(Relay_Pin, 0);}
   
     }
   },
   	"3e440008-f5bb-357d-719d-179272e4d4d9": {
    description: "Device Temp",  // optional, default is null,
     readable : true,
     notify: true,
     value : ["Temp_Location"]
   }
   }
   }, {});
   
   setInterval(function() {
   NRF.updateServices({
   "3e440001-f5bb-357d-719d-179272e4d4d9" : {
   "3e440002-f5bb-357d-719d-179272e4d4d9" : {
     value :  [data, heartrate],//to be able to see that read is correct
     notify: true
   },
   }
   }); }, 5000);
   
   // On disconnect, turn off led
   NRF.on('disconnect', function() {
   digitalWrite(LED2, 0);
   BLE_Disconnect();
   });
   
   NRF.on('connect', function() {
   digitalWrite(LED2, 1);
   BLE_Connect();
     
   });
   

Thank you again ,