text: /**
  * MIT License
  * Copyright (c) 2021 EMU Electronic AG (https://www.emuag.ch/). All rights reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in all
  * copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
  
  /**
   * decodeUplink is called by TheThingsNetwork
   * we use our parsePayload() for decoding
   * 
   * @param {*} input 
   * @returns object containing decoded payload
   * {
   *      "Active Energy Export T1": {
   *        "unit": "Wh",
   *        "value": 0
   *      },
   *      "Active Energy Export T2": {
   *        "unit": "Wh",
   *        "value": 0
   *      },
   *      "Active Energy Import T1": {
   *        "unit": "Wh",
   *        "value": 4000
   *      },
   *      "Active Energy Import T2": {
   *        "unit": "Wh",
   *        "value": 0
   *      },
   *      "Reactive Energy Export T1": {
   *        "unit": "varh",
   *        "value": 0
   *      },
   *      "Reactive Energy Export T2": {
   *        "unit": "varh",
   *        "value": 0
   *      },
   *      "Reactive Energy Import T1": {
   *        "unit": "varh",
   *        "value": 0
   *      },
   *      "Reactive Energy Import T2": {
   *        "unit": "varh",
   *        "value": 0
   *      },
   *      "medium": {
   *        "desc": "Electricity",
   *        "type": 1
   *      },
   *      "readoutInterval": 900,
   *      "timeStamp": 1635499020,
   *      "timestamp": {
   *        "unit": "seconds",
   *        "value": 1635499020
   *      }
   */
  function decodeUplink(input) {
      data = input.bytes;
      //uplink with only 2 bytes is only status update, ignore it 
      if(data.length<=2){
          return {};
      }
      
      var obj = {};
      
      
      //check CRC-8 which resides at the end
      crc8Received = data[data.length - 1];
      dataToCheck = [];
      for(var i = 0; i < data.length - 1; i++){
          dataToCheck.push(data[i]);
      }
      
      if (crc8_encode(dataToCheck).toString(16) === crc8Received.toString(16)) {
          //crc-8 seems ok, 
      } else {
          obj.warnings = ['crc-8 wrong'];
          //perhaps decide to stop further processing if crc-8 is wrong
      } 
      
      //first 4 bytes are allways the timestamp, this is the timestamp from the datalogger
      var timeStamp = getUint32(data);
      
      obj.data = parsePayload(data);
  
      //for TTN we strip unused information
      for(var property in obj.data){
          delete obj.data[property].cfgdescription;
          delete obj.data[property].cfgtariff;
          delete obj.data[property].cfgunit;
          delete obj.data[property].cfgorder;
          delete obj.data[property].order;
          
          
          
      }
  
      obj.data.timeStamp = timeStamp;
      obj.data.medium = {
          "type": 1,
          "desc": "Electricity"
      };
           
      return obj;
  }
  
  /**
   * Decode is called by Chirpstack
   * @param {*} fPort 
   * @param {*} data 
   * @param {*} variables 
   * @returns object containing decoded payload
   * 
   * {
   *  "Active Energy Import T1": {
   *     "unit": "Wh",
   *     "cfgdescription": 3,
   *     "cfgunit": 1,
   *     "cfgtariff": 1,
   *     "order": 3,
   *     "value": 1809
   *  },
   *  "Active Energy Import T2": {
   *     "unit": "Wh",
   *     "cfgdescription": 3,
   *     "cfgunit": 1,
   *     "cfgtariff": 2,
   *     "order": 4,
   *     "value": 128
   *  },
   *  "Active Energy Export T1": {
   *     "unit": "Wh",
   *     "cfgdescription": 5,
   *     "cfgunit": 1,
   *     "cfgtariff": 1,
   *     "order": 5,
   *     "value": 1149
   *  },
   *  "Active Energy Export T2": {
   *     "unit": "Wh",
   *     "cfgdescription": 5,
   *     "cfgunit": 1,
   *     "cfgtariff": 2,
   *     "order": 6,
   *     "value": 17794
   *  },
   *  "Reactive Energy Import T1": {
   *     "unit": "varh",
   *     "cfgdescription": 10,
   *     "cfgunit": 5,
   *     "cfgtariff": 1,
   *     "order": 7,
   *     "value": 1864
   *  },
   *  "Reactive Energy Import T2": {
   *     "unit": "varh",
   *     "cfgdescription": 10,
   *     "cfgunit": 5,
   *     "cfgtariff": 2,
   *     "order": 8,
   *     "value": 2600
   *  },
   *  "Reactive Energy Export T1": {
   *     "unit": "varh",
   *     "cfgdescription": 13,
   *     "cfgunit": 5,
   *     "cfgtariff": 1,
   *     "order": 9,
   *     "value": 338
   *  },
   *  "Reactive Energy Export T2": {
   *     "unit": "varh",
   *     "cfgdescription": 13,
   *     "cfgunit": 5,
   *     "cfgtariff": 2,
   *     "order": 10,
   *     "value": 9661
   *  },
   *  "timeStamp": 1635499800,
   *  "medium": {
   *     "type": 1,
   *     "desc": "Electricity"
   *  },
   *  "readoutInterval": 900
   * }
   */
  function Decode(fPort, data, variables) {
      //uplink with only 2 bytes is only status update, ignore it 
      if (data.length <= 2) {
          return {};
      }
      
      var obj = {};
      
      //check CRC-8 which resides at the end
      crc8Received = data[data.length - 1];
      dataToCheck = [];
      for(var i = 0; i < data.length - 1; i++){
          dataToCheck.push(data[i]);
      }
      
      if (crc8_encode(dataToCheck).toString(16) === crc8Received.toString(16)) {
          //crc-8 seems ok, 
      } else {
          obj.warnings = ['crc-8 wrong'];
          //perhaps decide to stop further processing if crc-8 is wrong
      } 
      
      //first 4 bytes are allways the timestamp, this is the timestamp from the datalogger
      var timeStamp = getUint32(data);
      obj = parsePayload(data);
      obj.timeStamp = timeStamp;
      
      obj.medium = {
          "type": 1,
          "desc": "Electricity"
      };
      
      //Default readout-interval is allways 15 minutes
      obj.readoutInterval = (15 * 60); //15 Min * 60 Sec
      //you can overwrite the readout-interval when defining variables for this meter
      if(variables !== null && variables.readoutInterval !== null){
           obj.readoutInterval = variables.readoutInterval;
      }
      
      return obj;
  }
  
  
  /**
   * encodeDownlink is called by TheThingsNetwork
   * @param {*} data Object containing configuration
   * @returns binary data 
   */
  function encodeDownlink(data){
  /**
   * Example JSON-Object for Timestamp, Energy 0x03-0x0A 
   * {
   *   "fPort": 1,
   *   "timeInterval": 15,
   *   "sndAck": true,
   *   "startReJoin": false,
   *   "portIsActive": true,
   *   "values": [
   *       1,
   *       3,
   *       4,
   *       5,
   *       6,
   *       7,
   *       8,
   *       9,
   *       10
   *   ]
   * } 
   * 
   */
      //fPort must be defined else define it
      if (data.data.fPort === null || data.data.fPort === undefined){
          data.data.fPort = 1;
      }
      fPort = data.data.fPort;
      bytes = [];
  
      //just call the Encode function 
      bytes = Encode(fPort, data.data, {});
           
      return {fPort: fPort, bytes: bytes};
  }
  
  /**
   * decodeDownlink is used by TheThingsNetwork
   * @param {*} input  binary data containing configuration
   * @returns data object containing decoded configuration
   */
  function decodeDownlink(input){
      //TODO 
      var data = {};
      return data;
  
  }
  /**
   * Encode is called by Chirpstack
   * @param {*} fPort 
   * @param {*} data Object containing configuration
   * @param {*} variables 
   * @returns binary data
   */
  function Encode(fPort, data, variables) {
  /**
   * Example JSON-Object for Timestamp, Energy 0x03-0x0A 
   * {
   *   "fPort": 1,
   *   "timeInterval": 15,
   *   "sndAck": true,
   *   "startReJoin": false,
   *   "portIsActive": true,
   *   "values": [
   *       1,
   *       3,
   *       4,
   *       5,
   *       6,
   *       7,
   *       8,
   *       9,
   *       10
   *   ]
   * } 
   * 
   */    
      bytes = [];
      
      //make sure the time is valid and between 1 and 65535!
      data.timeInterval = Math.min(data.timeInterval, 0xFFFF);
      data.timeInterval = Math.max(data.timeInterval,1 );
      
      //push second byte to first position
      bytes.push(data.timeInterval & 0X00FF);
      //push first byte to second pposition
      bytes.push(data.timeInterval >> 8);
      
      var configFlags = 0x00;
      //Send Acknowledge for each Uplink back
      if (data.sndAck) {
          configFlags |= 0x02;
      }
      //Start Re-Join
      if (data.startReJoin) {
          configFlags |= 0x04;
      }
      //Enable this port so it sends data
      if (data.portIsActive) {
          configFlags |= 0x08;
      }
      
      //Push the config flag on the stack
      bytes.push(configFlags);
      for(var i=0; i< data.values.length; i++) {
          bytes.push(data.values[i]);
      }
      //apply crc-8
      crc8 = crc8_encode(bytes);
      bytes.push(crc8);
      
      return bytes;
  }
  
  
   
  
  /**
  * read 1 byte of data an convert it to an Uint8
  * @param {*} data 
  * @returns 
  */
  function getUint8(data) {
      var value = data >>> 0;
      return value;
      
  }
  
  function flip(n) {
      var x = [];
      n = Number(n);
      //will work only for positive numbers
      var single = n.toString(2).split("");
      for(var i = 0; i<single.length; i++){
          x.push(single[i] == 1 ? 0 : 1);
      }
      
      var tmp = x.join("");
      var y = (parseInt(tmp, 2) + 1) * -1;
      return y;
  }
  
  
  /**
  * read 1 byte of data an convert it to an Int8
  * @param {*} data 
  * @returns 
  */
  function getInt8(data) {
      
      if(data === 0){return 0;}
      if(data >> 7 == 1){
          return flip(data);
      }
      var value = data >>> 0;
      return value;
  }
  /**
  * read 2 bytes of data an convert it to an Int16
  * @param {*} data 
  * @returns 
  */
  function getInt16(data) {
      
      value = (data[1] << 8 | data[0]);
      return value;
      
  }
  /**
  * read 2 bytes of data an convert it to an Uint16
  * @param {*} data 
  * @returns 
  */
  function getUint16(data) {
      value = (data[1] << 8 | data[0]) >>> 0;
      return value;
      
      
  }
  /**
  * read 4 bytes of data an convert it to an Int32
  * @param {*} data 
  * @returns 
  */
  function getInt32(data) {
      value = (data[3] << 24 | data[2] << 16 | data[1] << 8 | data[0]);
      return value;
      
      
      
  }
  /**
  * * read 4 bytes of data an convert it to an Uint32
  * @param {*} data 
  * @returns 
  */
  function getUint32(data) {
      
      value = (data[3] << 24 | data[2] << 16 | data[1] << 8 | data[0]) >>> 0;
      return value;
  }
  
  
  
  /**
  * read 8 bytes of data an convert it to an Int64
  * @param {*} data 
  * @returns 
  */
  function getInt64(data) {
      //JS can't handle bitwise operation with more than 32bit !
      //so this won't work 
      //if Chirpstack will use another javascript engine we could use typearray's
      var value = Number((data[7] << 56 | data[6] << 48 | data[5] << 40 | data[4] << 32 | data[3] << 24 | data[2] << 16 | data[1] << 8 | data[0]));
      return value;
      
  }
  /**
  * * read 8 bytes of data an convert it to an Uint32
  * @param {*} data 
  * @returns 
  */
  function getUint64(data) {
      //JS can't handle bitwise operation with more than 32bit !
      //so this won't work 
      //if Chirpstack will use another javascript engine we could use typearray's
      
      value = Number((data[7] << 56 | data[6] << 48 | data[5] << 40 | data[4] << 32 | data[3] << 24 | data[2] << 16 | data[1] << 8 | data[0]) >>> 0);
      return value;
      
  }
  
  function getBCD(data) {
      var bcd = "";
      for(var i=0; i< data.length; i++) {
          bcd = bcd + "" + data[i];
          
      }
      
      return bcd;
  }
  
  
  function getASCII(data) {
      var ascii = "";
      
      for(var i=0; i< data.length; i++) {
          entry = getUint8(data[i]);
          if (entry != 0x00) {
              ascii = ascii + String.fromCharCode(entry.toString());
          }
      }
      return ascii;
  }
  /**
  * parses the variable data and returns an object
  * 
  * a value is identified by its id
  * 
  * @param {*} obj 
  * @param {*} data 
  */
  function parsePayload(data){
      var dataTypes = [];
      
      //be sure to fill the complete array
      //if we receive an invalid datatype we skip the rest of the data 
      for (i = 0; i < 256; i++) {
          dataTypes[i] = {'len': 255,'description': 'invalid data-type'};
      }
      
      //the "order" is assigned according to the entry
      dataTypes[0x00]=  {'len':4, 'description': 'data-logger-index', 'dataType': 'Uint32'};
      dataTypes[0x01] = {'len':4, 'description': 'timestamp',  'dataType': 'Uint32', 'unit':'seconds'};
      dataTypes[0x02] = {'len':4, 'description': 'timestamp-previous', 'dataType': 'Uint32', 'unit': 'seconds'};
      dataTypes[0x03] = {'len':4, 'description': 'Active Energy Import T1', 'dataType': 'Uint32', 'unit': 'Wh', 'cfgdescription': 3, "cfgunit": 1, 'cfgtariff':1};
      dataTypes[0x04] = {'len':4, 'description': 'Active Energy Import T2', 'dataType': 'Uint32', 'unit': 'Wh', 'cfgdescription': 3, "cfgunit": 1, 'cfgtariff':2};
      dataTypes[0x05] = {'len':4, 'description': 'Active Energy Export T1', 'dataType': 'Uint32', 'unit': 'Wh', 'cfgdescription': 5, "cfgunit": 1, 'cfgtariff':1};
      dataTypes[0x06] = {'len':4, 'description': 'Active Energy Export T2', 'dataType': 'Uint32', 'unit': 'Wh', 'cfgdescription': 5, "cfgunit": 1, 'cfgtariff':2};
      dataTypes[0x07] = {'len':4, 'description': 'Reactive Energy Import T1', 'dataType': 'Uint32', 'unit': 'varh', 'cfgdescription': 10, "cfgunit": 5, 'cfgtariff':1};
      dataTypes[0x08] = {'len':4, 'description': 'Reactive Energy Import T2', 'dataType': 'Uint32', 'unit': 'varh', 'cfgdescription': 10, "cfgunit": 5, 'cfgtariff':2};
      dataTypes[0x09] = {'len':4, 'description': 'Reactive Energy Export T1', 'dataType': 'Uint32', 'unit': 'varh', 'cfgdescription': 13, "cfgunit": 5, 'cfgtariff':1};
      dataTypes[0x0A] = {'len':4, 'description': 'Reactive Energy Export T2', 'dataType': 'Uint32', 'unit': 'varh', 'cfgdescription': 13, "cfgunit": 5, 'cfgtariff':2};
      dataTypes[0x0B] = {'len':4, 'description': 'Active Power L123', 'dataType': 'Int32', 'unit': 'W', 'cfgdescription': 25, "cfgunit": 13};
      dataTypes[0x0C] = {'len':4, 'description': 'Active Power L1',   'dataType': 'Int32', 'unit': 'W', 'cfgdescription': 25, "cfgunit": 13, 'cfgphase': 1};
      dataTypes[0x0D] = {'len':4, 'description': 'Active Power L2',   'dataType': 'Int32', 'unit': 'W', 'cfgdescription': 25, "cfgunit": 13, 'cfgphase': 2};
      dataTypes[0x0E] = {'len':4, 'description': 'Active Power L3',   'dataType': 'Int32', 'unit': 'W', 'cfgdescription': 25, "cfgunit": 13, 'cfgphase': 3};
      dataTypes[0x0F] = {'len':4, 'description': 'Current L123', 'dataType': 'Int32', 'unit': 'mA', 'cfgdescription': 31, "cfgunit": 28};
      dataTypes[0x10] = {'len':4, 'description': 'Current L1',   'dataType': 'Int32', 'unit': 'mA', 'cfgdescription': 31, "cfgunit": 28, 'cfgphase': 1};
      dataTypes[0x11] = {'len':4, 'description': 'Current L2',   'dataType': 'Int32', 'unit': 'mA', 'cfgdescription': 31, "cfgunit": 28, 'cfgphase': 2};
      dataTypes[0x12] = {'len':4, 'description': 'Current L3',   'dataType': 'Int32', 'unit': 'mA', 'cfgdescription': 31, "cfgunit": 28, 'cfgphase': 3};
      dataTypes[0x13] = {'len':4, 'description': 'Current N',    'dataType': 'Int32', 'unit': 'mA', 'cfgdescription': 31, "cfgunit": 28, 'cfgphase': 4};
      dataTypes[0x14] = {'len':4, 'description': 'Voltage L1-N',  'dataType': 'Int32', 'unit': 'V/10', 'unit_calculated': 'V', 'factor': 0.1, 'fixed': 1, 'cfgdescription': 30, "cfgunit": 26, 'cfgphase': 1};
      dataTypes[0x15] = {'len':4, 'description': 'Voltage L2-N',  'dataType': 'Int32', 'unit': 'V/10', 'unit_calculated': 'V', 'factor': 0.1, 'fixed': 1, 'cfgdescription': 30, "cfgunit": 26, 'cfgphase': 2};
      dataTypes[0x16] = {'len':4, 'description': 'Voltage L3-N',  'dataType': 'Int32', 'unit': 'V/10', 'unit_calculated': 'V', 'factor': 0.1, 'fixed': 1, 'cfgdescription': 30, "cfgunit": 26, 'cfgphase': 3};
      dataTypes[0x17] = {'len':1, 'description': 'Powerfactor L1',  'dataType': 'Int8', 'unit': 'Cos','factor': 0.01, 'fixed': 2, 'cfgdescription': 32, "cfgunit": 31, 'cfgphase': 1};
      dataTypes[0x18] = {'len':1, 'description': 'Powerfactor L2',  'dataType': 'Int8', 'unit': 'Cos','factor': 0.01, 'fixed': 2, 'cfgdescription': 32, "cfgunit": 31, 'cfgphase': 2};
      dataTypes[0x19] = {'len':1, 'description': 'Powerfactor L3',  'dataType': 'Int8', 'unit': 'Cos','factor': 0.01, 'fixed': 2, 'cfgdescription': 32, "cfgunit": 31, 'cfgphase': 3};
      dataTypes[0x1A] = {'len':2, 'description': 'Frequency',  'dataType': 'Int16', 'unit': 'Hz', 'factor': 0.1, 'fixed': 1,  'cfgdescription': 33, "cfgunit": 32};
      dataTypes[0x1B] = {'len':4, 'description': 'Active Power average',  'dataType': 'Int32', 'unit': 'W',  "cfgunit": 13,};
      dataTypes[0x1C] = {'len':4, 'description': 'Active Energy Import T1 kWh', 'dataType': 'Uint32', 'unit': 'kWh', 'cfgdescription': 3, "cfgunit": 2, 'cfgtariff':1};
      dataTypes[0x1D] = {'len':4, 'description': 'Active Energy Import T2 kWh', 'dataType': 'Uint32', 'unit': 'kWh', 'cfgdescription': 3, "cfgunit": 2, 'cfgtariff':2};
      dataTypes[0x1E] = {'len':4, 'description': 'Active Energy Export T1 kWh', 'dataType': 'Uint32', 'unit': 'kWh', 'cfgdescription': 5, "cfgunit": 2, 'cfgtariff':1};
      dataTypes[0x1F] = {'len':4, 'description': 'Active Energy Export T2 kWh', 'dataType': 'Uint32', 'unit': 'kWh', 'cfgdescription': 5, "cfgunit": 2, 'cfgtariff':2};
      dataTypes[0x20] = {'len':4, 'description': 'Reactive Energy Import T1 kvarh', 'dataType': 'Uint32', 'unit': 'kvarh', 'cfgdescription': 10, "cfgunit": 6, 'cfgtariff':1};
      dataTypes[0x21] = {'len':4, 'description': 'Reactive Energy Import T2 kvarh', 'dataType': 'Uint32', 'unit': 'kvarh', 'cfgdescription': 10, "cfgunit": 6, 'cfgtariff':2};
      dataTypes[0x22] = {'len':4, 'description': 'Reactive Energy Export T1 kvarh', 'dataType': 'Uint32', 'unit': 'kvarh', 'cfgdescription': 13, "cfgunit": 6, 'cfgtariff':1};
      dataTypes[0x23] = {'len':4, 'description': 'Reactive Energy Export T2 kvarh', 'dataType': 'Uint32', 'unit': 'kvarh', 'cfgdescription': 13, "cfgunit": 6, 'cfgtariff':2};
      dataTypes[0x24] = {'len':8, 'description': 'Active Energy Import T1 64bit', 'dataType': 'uInt64', 'unit': 'Wh', 'cfgdescription': 3, "cfgunit": 1, 'cfgtariff':1};
      dataTypes[0x25] = {'len':8, 'description': 'Active Energy Import T2 64bit', 'dataType': 'uInt64', 'unit': 'Wh', 'cfgdescription': 3, "cfgunit": 1, 'cfgtariff':2};
      dataTypes[0x26] = {'len':8, 'description': 'Active Energy Export T1 64bit', 'dataType': 'uInt64', 'unit': 'Wh', 'cfgdescription': 5, "cfgunit": 1, 'cfgtariff':1};
      dataTypes[0x27] = {'len':8, 'description': 'Active Energy Export T2 64bit', 'dataType': 'uInt64', 'unit': 'Wh', 'cfgdescription': 5, "cfgunit": 1, 'cfgtariff':2};
      dataTypes[0x28] = {'len':8, 'description': 'Reactive Energy Import T1 64bit',  'dataType': 'uInt64', 'unit': 'varh', 'cfgdescription': 10, "cfgunit": 5, 'cfgtariff':1};
      dataTypes[0x29] = {'len':8, 'description': 'Reactive Energy Import T2 64bit',  'dataType': 'uInt64', 'unit': 'varh', 'cfgdescription': 10, "cfgunit": 5, 'cfgtariff':2};
      dataTypes[0x2A] = {'len':8, 'description': 'Reactive Energy Export T1 64bit',  'dataType': 'uInt64', 'unit': 'varh', 'cfgdescription': 13, "cfgunit": 5, 'cfgtariff':1};
      dataTypes[0x2B] = {'len':8, 'description': 'Reactive Energy Export T2 64bit',  'dataType': 'uInt64', 'unit': 'varh', 'cfgdescription': 13, "cfgunit": 5, 'cfgtariff':2};
      dataTypes[0xF0] = {'len':1, 'description': 'errorcode',  'dataType': 'ErrorCode'};
      dataTypes[0xF1] = {'len':4, 'description': 'serial-number',  'dataType': 'MeterSerial'};
      dataTypes[0xF2] = {'len':4, 'description': 'factor-number',  'dataType': 'MeterSerial'};
      dataTypes[0xF3] = {'len':2, 'description': 'current-transformer primary',  'dataType': 'Uint16',   "cfgunit": 72,};
      dataTypes[0xF4] = {'len':2, 'description': 'current-transformer secondary',  'dataType': 'Uint16', "cfgunit": 72,};
      dataTypes[0xF5] = {'len':2, 'description': 'voltage-transformer primary',  'dataType': 'Uint16',   "cfgunit": 72,};
      dataTypes[0xF6] = {'len':2, 'description': 'voltage-transformer secondary',  'dataType': 'Uint16', "cfgunit": 72,};
      dataTypes[0xF7] = {'len':1, 'description': 'meter-typ',  'dataType': 'Uint8'};
      dataTypes[0xF8] = {'len':4, 'description': 'MID year',  'dataType': 'BCD',};
      dataTypes[0xF9] = {'len':4, 'description': 'factory year',  'dataType': 'BCD',};
      dataTypes[0xFA] = {'len':4, 'description': 'firmware version',  'dataType': 'ASCII'};
      dataTypes[0xFB] = {'len':4, 'description': 'mid-Version',  'dataType': 'ASCII'};
      dataTypes[0xFC] = {'len':4, 'description': 'manufacturer',  'dataType': 'ASCII'};
      dataTypes[0xFD] = {'len':4, 'description': 'hw-index',  'dataType': 'ASCII'};
      dataTypes[0xFE] = {'len':4, 'description': 'systemtime',  'dataType': 'Uint32'};
      
      
      var obj = {};
      
      var i = 4; //the first 4 bytes is allways the timestamp
      //the last byte is the crc-code so ignore this one
      while (i < (data.length - 1)) {
          //extract signature byte 
          indexOfDataType = data[i];
          dataType = dataTypes[indexOfDataType];
          i++;
          //also save the sort-order value  
          dataType.order = indexOfDataType;
          
          switch (dataType.dataType) {
              case 'Int8':
              dataType.value = Number(getInt8([data[i++]]));
              break;
              case 'Uint8':
              dataType.value = Number(getUint8([data[i++]]));
              break;
              case 'Int16':
              dataType.value = Number(getInt16([data[i++], data[i++]]));
              break;
              case 'Uint16':
              dataType.value = Number(getUint16([data[i++], data[i++]]));
              break;
              case 'Uint32':
              dataType.value = Number(getUint32([data[i++], data[i++], data[i++], data[i++]]));
              break;
              case 'Int32':
              dataType.value = Number(getInt32([data[i++], data[i++], data[i++], data[i++]]));
              break;
              case 'uInt64':
              dataType.value = Number(getUint64([data[i++], data[i++], data[i++], data[i++], data[i++], data[i++], data[i++], data[i++]]));
              break;
              case 'Int64':
              dataType.value = Number(getInt64([data[i++], data[i++], data[i++], data[i++], data[i++], data[i++], data[i++], data[i++]]));
              break;
              case 'MeterSerial':
              dataType.value = ('0' + Number(getUint8([data[i++]])).toString(16)).substr(0,2);
              dataType.value = ('0' + Number(getUint8([data[i++]])).toString(16)).substr(0,2) + dataType.value;
              dataType.value = ('0' + Number(getUint8([data[i++]])).toString(16)).substr(0,2) + dataType.value;
              dataType.value = ('0' + Number(getUint8([data[i++]])).toString(16)).substr(0,2) + dataType.value;
              
              break;
              case 'BCD':
              dataType.value = getBCD([data[i++], data[i++], data[i++], data[i++]]);
              break;
              case 'ASCII':
              dataType.value = getASCII([data[i++], data[i++], data[i++], data[i++]]);
              break;
              case 'ErrorCode':
              dataType.value =  Number(getUint8([data[i++]]));
              //also encode the error
              dataType.TimeChanged =  dataType.value & 0x01 ? true : false;
              dataType.CTRatioChange =  dataType.value & 0x02 ? true : false;
              dataType.VTRatioChange =  dataType.value & 0x04 ? true : false;
              dataType.ImpulseWidthChange =  dataType.value & 0x08 ? true : false;
              dataType.ImpulseRatioChange =  dataType.value & 0x10 ? true : false;
              dataType.PowerFail =  dataType.value & 0x20 ? true : false;
              dataType.LogbookFull = dataType.value & 0x80 ? true : false;
              
              break;
              default:
              break;
              
          }
          //if we have a factor apply it but keep the old value
          if (dataType.factor && !isNaN(dataType.factor)) {
              var fixed = 0;
              if (dataType.fixed && !isNaN(dataType.fixed)) {
                  fixed = dataType.fixed;
              }
              //save the value which was sent by the meter (perhaps needed later)
              dataType.value_raw = dataType.value;
              //calculate the new value using the factor
              dataType.value = Number((dataType.value * dataType.factor).toFixed(fixed));
          }
          
          obj[dataType.description] = dataType;
          //remove all unused infos like dataType, description, len
          delete dataType.len;
          delete dataType.description;
          delete dataType.dataType;
          delete dataType.factor;
          delete dataType.fixed;
      }
      
      return obj;
      
      
  }
  function crc8_encode(data) {
      
      var xorOut = 0x0000;
      var table = [
          0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B,
          0x12, 0x15, 0x38, 0x3F, 0x36, 0x31,
          0x24, 0x23, 0x2A, 0x2D, 0x70, 0x77,
          0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65,
          0x48, 0x4F, 0x46, 0x41, 0x54, 0x53,
          0x5A, 0x5D, 0xE0, 0xE7, 0xEE, 0xE9,
          0xFC, 0xFB, 0xF2, 0xF5, 0xD8, 0xDF,
          0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD,
          0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B,
          0x82, 0x85, 0xA8, 0xAF, 0xA6, 0xA1,
          0xB4, 0xB3, 0xBA, 0xBD, 0xC7, 0xC0,
          0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2,
          0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4,
          0xED, 0xEA, 0xB7, 0xB0, 0xB9, 0xBE,
          0xAB, 0xAC, 0xA5, 0xA2, 0x8F, 0x88,
          0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A,
          0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C,
          0x35, 0x32, 0x1F, 0x18, 0x11, 0x16,
          0x03, 0x04, 0x0D, 0x0A, 0x57, 0x50,
          0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42,
          0x6F, 0x68, 0x61, 0x66, 0x73, 0x74,
          0x7D, 0x7A, 0x89, 0x8E, 0x87, 0x80,
          0x95, 0x92, 0x9B, 0x9C, 0xB1, 0xB6,
          0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4,
          0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2,
          0xEB, 0xEC, 0xC1, 0xC6, 0xCF, 0xC8,
          0xDD, 0xDA, 0xD3, 0xD4, 0x69, 0x6E,
          0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C,
          0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A,
          0x43, 0x44, 0x19, 0x1E, 0x17, 0x10,
          0x05, 0x02, 0x0B, 0x0C, 0x21, 0x26,
          0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34,
          0x4E, 0x49, 0x40, 0x47, 0x52, 0x55,
          0x5C, 0x5B, 0x76, 0x71, 0x78, 0x7F,
          0x6A, 0x6D, 0x64, 0x63, 0x3E, 0x39,
          0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B,
          0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D,
          0x14, 0x13, 0xAE, 0xA9, 0xA0, 0xA7,
          0xB2, 0xB5, 0xBC, 0xBB, 0x96, 0x91,
          0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,
          0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5,
          0xCC, 0xCB, 0xE6, 0xE1, 0xE8, 0xEF,
          0xFA, 0xFD, 0xF4, 0xF3
      ];
      var crc = 0x0000;
      for (var j = 0; j < data.length; j++) {
          crc = table[crc ^ data[j]];
      }
      return (crc ^ xorOut) & 0xFFFF;
      
  }
  