fresh start with MDBT42Q , some specs before start toe code

so 3.5 questions about it :

1. I guess I need to convert the 0x1D to 29 using some java hex to DEC function ?
   
2. I'm trying to read it using nRF , as I understand from the API Reference
   
3. 
   > NRF.setServices({ 0xBCDE : {
   > 0xABCD : {
   > value : "Hello", // optional
   > description: "My Characteristic", // optional, default is null,
   
   

I thought maybe I can write something there - but if it's no used , so never mind.

1. what is 'heartrate' mean in the value section ?

   NRF.setServices({
   0x180D: { // heart_rate
   0x2A37: { // heart_rate_measurement
     notify: true,
     value : [0x06, heartrate],
   }
   }
   }, { advertise: [ '180D' ] });
   

does it tell that the data is bpm ? - if I'm correct :
where can I find a list of what I can put \ which values?

can I say I'm sending temperature using

value = [0x1d, temperature]

then when I will read the data it will change it to C and I will see 29 ?

3.5 what will be if I'm sending heartrate using my own UUID ?

Thanks ,