Write a floating value about node-eibd

[andreek]

Hey,

thank you, it's really kind to get such a feedback.

The encoding isn't implemented in this module, so you have to do more to send a floating value. I guess you mean EIS5/DPT9 Values.

var encodeDPT9 = function(value) {

  var state = value;

  var data = null;
  var sign = (state < 0 ? 0x8000 : 0 );
  var exp = 0;
  var mant = 0;

  mant = new Number(state * 100.0);

  while( Math.abs(mant) > 2046 ) {
    mant = mant >> 1;
    exp += 1;
  }

  data = sign | (exp << 11) | (mant & 0x07ff);

  var buf = new Array(3);
  buf[0] = 0;
  buf[1] = data >> 8;
  buf[2] = data & 0xff;

  return buf;

};

var conn    = eibd.Connection();
var address = eibd.str2addr('1/0/0');

conn.socketRemote({ host: host, port: port }, function() {
    conn.openTGroup(address, 1, function (err) {
      if(err) {
        callback(err);
      } else {

        var data = encodeDPT9(20.5);
        conn.sendAPDU(data, callback);

      }
    });
})

I hope this is a solution for your issue. I've only executed the code local with tests and not in any eibd/knx environment, because I don't have access to one at the moment.

[ptorrent]

Thanks ! I'll see if it's work.

I found a little problem in your example :

parser.on('write', function(src, dest, val){
console.log('Write from '+src+' to '+dest+': '+val);
});

==>

parser.on('write', function(src, dest, dpt, val){
console.log('Write from '+src+' to '+dest+': '+val);
});

You just missed the dpt argument in your function

[andreek]

Thanks. I've fixed it.