PUCK Ble HID keyboard

By "playing around", I was using an editor and the console in Chrome to try and get my head around callbacks. In the end I went through a number of the tutorials on w3schools and think I have a better idea of it now. I wanted to add console.logs so I could see exactly when/where the code was failing because I would need to be disconnected from the IDE to test the BLE HID sending.

I am conscious that I am taking up your time in what may be considered my JS education rather than anything Espruino specific. I am grateful of everybody who has contributed to this thread.

@allObjects, I tried implementing your updated code with the console.logs. (here is the entire script)

var kb = require("ble_hid_keyboard");
NRF.setServices(undefined, { hid : kb.report });

// setup of you convenience hidKeyBoardObject... (here or later)
var hidKBD = ( { string: ""
                
, type: function(s) { 
    this.string += s; 
    if (this.string.length == s.length) { 
                      
                      
      this._send(this.string.charAt(0)); // get first char out
  } }
,   _send: function(c) {
        console.log("About to send char",c);
        kb.tap(kb.KEY[c],0,this._sent.bind(this));
    }
,   _sent: function() {
        console.log("Char",this.string.charAt(0),"has been sent / tapped");
        this.string = this.string.substring(1);
        console.log("Left to send / tap is",this.string);
        if (this.string.length > 0) {
            console.log("Since length of this.string is",this.string.length
                       ,"and is > 0, next char 'in line' -"
                       ,this.string.charAt(0)," - has to be sent / tapped.");
            this._send(this.string.charAt(0));
        } else {
            console.log("Since nothing is left to tap / send - all is tapped");
            console.log("/ sent, (FIFO  is empty), nothing has to be done");
            console.log(" anymore and  'logical recursion' stops/ends  here.");
        }
    }
});

// setup and other code functions of yours (here or before hidKBD)
   // invoke your set up code as needed (init and getting connections)
   function startSend(){
     hidKBD.type("ABC");}
  // hidKBD.type("XYZ");

	
setWatch(startSend, BTN, {edge:"rising",repeat:true,debounce:50});

I can now see that I am getting an error after the second character has been sent, here is the full console output from espruino IDE:

BLE Connected, queueing BLE restart for later
About to send char A
Char A has been sent / tapped
Left to send / tap is BC
Since length of this.string is 2 and is > 0, next char 'in line' - B - has to be sent / tapped.
About to send char B
Char B has been sent / tapped
Left to send / tap is C
Since length of this.string is 1 and is > 0, next char 'in line' - C - has to be sent / tapped.
About to send char C
Uncaught Error: Got BLE error 0x3004 (NO_TX_PACKETS)
at line 1 col 104
...0,0,0],function(){a&&a()})})

                          ^

in function "tap" called from line 16 col 49

    kb.tap(kb.KEY[c],0,this._sent.bind(this));
                                            ^

in function "_send" called from line 26 col 45

        this._send(this.string.charAt(0));
                                        ^

in function "a" called from line 1 col 6
a&&a()

 ^

in function called from system
ab