fresh start with MDBT42Q , some specs before start toe code

I have mange to work and took an working example from here:
https://www.espruino.com/BLE+Communicati­ons

this is the code I have wrote:

My_MAC = NRF.getAddress();

print("My MAC address is " , My_MAC);
var n = "0";

NRF.setServices({
  "3e440001-f5bb-357d-719d-179272e4d4d9": {
    "3e440002-f5bb-357d-719d-179272e4d4d9": {
      writable : true,
      onWrite : function(evt) {
        n = evt.data[0];
        if (n < 18) {
  digitalWrite(LED, 1);
}
       else {
       digitalWrite(LED, 0);}

      }
    },
	"3e440003-f5bb-357d-719d-179272e4d4d9": {
      readable : true,
      value : [getTime()]
    }
  }
}, {});

// On disconnect, turn off led
NRF.on('disconnect', function() {
  digitalWrite(LED, 0);
});


NRF.setAdvertising({}, {name:"Test_Read_Write"});

when I connect using android phone "nRF Connect "
I can see I have 2 chars from 1 service
3e440002 is write
3e440003 is read

I have 3 questions :
when I connect to the 3e440002 - and send any byte - LED is on (which is good for me to understand how things works )
when I connect to 3e440003 - he only show me "4C 'L'"

1. what do I need to do in order to see "live" data (timestamp - just to see it's alive), or even the latest byte I sent to the device?
   
2. is there any to see console.print while I'm connecting using web ide on my computer?
   or do I have to connect it using serial cables?
   

3. when I use a python code to send data I get this error:

   Characteristic 3e440002-f5bb-357d-719d-179272e4d4d9 does not support write operations!
   

when I use the same code to connect to Arduino with the same chars - I can send data to it ,
also as I mention before - on android nRF I can send messages

so what am I missing ?

Thanks ,