TTN Decoder senseBox Full Setup

TTN_decoder.js

/**
 * Convert the array of bytes to an unsigned integer, LSB. 
 *
 * BEWARE: This is only safe up to 0x1FFFFFFFFFFFFF, so: 6 bytes.
 */
function uint(bytes) {

  return bytes.reduceRight(function(acc, b) {
    // We expect an unsigned value, so to support more than 3 bytes
    // don't use any bitwise operators, which would always yield a
    // signed 32 bits integer instead.
    return acc * 0x100 + b;
  }, 0);
}

function Decoder(bytes) {

  var i = 0;     
  var decoded = {};
  // The index in the bytes array that needs to be handled next;
  // use along with "i++" which returns the current value, and
  // then increments it for the next usage


  // Temperature with 0.0013 precision, -18.000 through 67.000, LSB
  var temperature = uint(bytes.slice(i, i+=2)) / 771 - 18;
  // Unary plus operator to cast string result of toFixed to number
  temperature = +temperature.toFixed(3);
  // Relative humidity with 0.01 precision, 0.00 through 100.00, LSB
  var humidity = uint(bytes.slice(i, i+=2)) / 100;
  // Pressure with 0.012 precision, 300.00 through 1100.00, LSB
  var pressure = uint(bytes.slice(i, i+=2)) / 81.9187 + 300;
  pressure = +pressure.toFixed(2);
  var lux = bytes[i] | bytes[i+1]<<8 | bytes[i+2]<<16;
  i = i + 3
  var uv = bytes[i] | bytes[i+1]<<8 | bytes[i+2]<<16;
  i = i + 3
  var pm10 = uint(bytes.slice(i, i+=2)) / 10;
  var pm25 = uint(bytes.slice(i, i+=2)) / 10;
  
  decoded['5e0f91d2b0c088001b89ff2f'] = temperature
  decoded['5e0f91d2b0c088001b89ff2e'] = humidity
  decoded['5e0f91d2b0c088001b89ff2d'] = pressure
  decoded['5e0f91d2b0c088001b89ff2c'] = lux
  decoded['5e0f91d2b0c088001b89ff2b'] = uv
  decoded['5e0f91d2b0c088001b89ff2a'] = pm10
  decoded['5e0f91d2b0c088001b89ff29'] = pm25
  
  return decoded;
}