knx/src/dptlib/dpt232.js

KNXnet/IP protocol implementation for Node(>=6.x)

/**
 * knx.js - a KNX protocol stack in pure Javascript
 * (C) 2016-2019 Elias Karakoulakis
 */

const log = require('log-driver').logger;

//
// DPT232: 3-byte RGB color array
// MSB: Red, Green, LSB: Blue
//
exports.formatAPDU = (value) => {
  if (value == null) return log.error('DPT232: cannot write null value');

  if (typeof value === 'object') {
    const { red, green, blue } = value;
    if (
      red >= 0 &&
      red <= 255 &&
      green >= 0 &&
      green <= 255 &&
      blue >= 0 &&
      blue <= 255
    )
      return Buffer.from([red, green, blue]);
  }
  log.error(
    'DPT232: Must supply an value {red:0..255, green:0.255, blue:0.255}'
  );
};

exports.fromBuffer = (buf) => {
  const [red, green, blue] = buf;
  return { red, green, blue };
};

exports.basetype = {
  bitlength: 3 * 8,
  valuetype: 'basic',
  desc: 'RGB array',
};

exports.subtypes = {
  600: {
    name: 'RGB',
    desc: 'RGB color triplet',
    unit: '',
    scalar_range: [,],
    range: [,],
  },
};