Write hex value to a characteristic?

OK - does not work for me either.

I have not hardcoded the MAC but search for devices with the corresponding service:

function setLight( r, g, b ) {
  var gatt;
  var c;

  console.log( "rgb=", r, g, b );
  NRF.requestDevice(
    {filters:[{services:["FF02"]}]}
  ).then( dev=>{
    console.log( "found", dev.name );
    return dev.gatt.connect();
  }).then( g => {
    console.log( "connected" );
    gatt = g;
    return gatt.getPrimaryService("FF02");
  }).then(function(service) {
    console.log( "service found" );
    return service.getCharacteristic("FFFC");
  }).then(function(characteristic) {
    console.log( "characteristic found" );
    c = characteristic;
    return c.readValue();
  }).then( v => {
    console.log( "value", v );
    return c.writeValue(String.fromCharCode(0,r,g,b­));
  }).then( r => {
    console.log( "result", r );
    gatt.disconnect();
    console.log("Done!");
  });
}


var col = 1;

setWatch(
  evt => {
    var long = ( evt.time - evt.lastTime ) > 0.2;
    if( long ) {
      setLight( 0, 0, 0 );
    }
    else {
      col++;
      if( col > 7 ) col = 1;

      console.log( "col", col );
      setLight( 
        col & 1 ? 0xFF : 0, 
        col & 2 ? 0xFF : 0,
        col & 4 ? 0xFF : 0
      );
    }
  },
  BTN,
  { edge: "falling", debounce: 50, repeat: true } 
);

readValue()correctly returns the 4 bytes (white-red-green-blue) I have written with LightBlue to Service FF02 / Characteristic FFFC before.

But writeValue()does not do or return anything.

@Gordon: You are right. LightBlue shows WriteWithoutResponse for the Characteristic in question by the way.

Is that something the puck BLE code does not handle yet?

2 Attachments