Puck Advertising Private Characteristic and r/w

Hi,

im totally new with Puck.js and Javascript at all but I'm trying to advertise a own private Characteristic with 2 Services.

One service to controll the LEDs from the Puck from a external device and the other service for button state from Puck.

First Service is writable from external device, the second one is just readable but with notifications.

var timeout;
function flag() {
  if (timeout) clearTimeout();
  LED1.set();
  timeout = setTimeout(function() {
    timeout = undefined;
    LED2.set();
  },2000);
}

//setWatch(flag, BTN, {repeat:true});

// New code to define services
NRF.setServices({
  "3e440001-f5bb-357d-719d-179272e4d4d9": {
    "3e440002-f5bb-357d-719d-179272e4d4d9": {
      value : [0],
      maxLen : 1,
      writable : true,
      onWrite : function(evt) {
        // When the characteristic is written, raise flag
        flag();
      }
    }
  }
}, { uart : false });
// Change the name that's advertised
NRF.setAdvertising({}, {name:"BTN"});
console.log("CONTROL BUTTON");

That code works, if I'm writing into the service the LED1 rises. But i want to check what value is transmitted. But I cant find any documentation about NRF.setServices so I dont know how to read out the value.

How do I make the second service with button state?

A bit off topic question: As I saw the Puck only can connect with one device at once, thats ok but later I want that the code is execute during boot, is it still possible to access from Espruino IDE then?

EDIT: Okay, I found that code:
digitalWrite([LED3,LED2,LED1], evt.data[0]); which reads the value and works fine. But how to do the second task?

Also: I need to restart iPhone (use BLE Scanner) after changing the Services. Otherwise it will not displayed. Very irritating. Is there a workaround?

Update:

Im done with second characteristic and it works. But with notify it stocks.

Here is the Code:

NRF.setServices({
  "b0d0cdff-56fa-4bee-b611-874c82f0c313": {
   "9ed52c1b-73e4-47a9-b335-8e12cfa22fdc": {
      value : 0,
      writable : false,
      notify:true
    }
  }
}, { uart : false });

And the update code:

NRF.updateServices({
  "b0d0cdff-56fa-4bee-b611-874c82f0c313" : {
    "9ed52c1b-73e4-47a9-b335-8e12cfa22fdc" : {
      value : 1,
      notify: true
    }
  }
});

The state switch and I can set Notify into the BLE App but no notification received.

Fri 2019.07.19

Hi @user101905, there are many links to assist that I just posted in a separate user thread:

http://forum.espruino.com/conversations/336276/

'But I cant find any documentation about NRF.setServices'

This is a good starting point:

https://www.espruino.com/Reference#l_NRF_setServices

Ok, so it looks like your first issue (getting the data in a write notification) is sorted?

How do I make the second service with button state?

You just add an extra element to the object. For example:

NRF.setServices({
  "3e440001-f5bb-357d-719d-179272e4d4d9": {
    "3e440002-f5bb-357d-719d-179272e4d4d9": {
      value : [0],
      maxLen : 1,
      writable : true,
      onWrite : function(evt) {      }
    },
    "3e440003-f5bb-357d-719d-179272e4d4d9": {
      value : [0],
      maxLen : 1,
      writable : true,
      onWrite : function(evt) {  }
    }
  }
}, { uart : false });

What you're doing with updateServices looks fine. All I'd say is it's far more efficient to use the same basic UUID and to change the second group of 4 digits as you did in the first example.

I just tried this code and it works fine:

NRF.setServices({
 "3e440001-f5bb-357d-719d-179272e4d4d9": {
   "3e440003-f5bb-357d-719d-179272e4d4d9": {
      value : 0,
      writable : false,
      notify:true
    }
  }
});

var n=1;
setWatch(function() {
  NRF.updateServices({
    "3e440001-f5bb-357d-719d-179272e4d4d9": {
      "3e440003-f5bb-357d-719d-179272e4d4d9": {
        value : n++,
        notify: true
      }
    }
  });
}, BTN1, {repeat:true,edge:"rising"});