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velux-klf200-api

this is an Node for the API on the Velux© KLF-200 io-homecontrol© Gateway. (klf-200 provided by Velux©. I'm not affiliated.)

This implementation is based on the API documentation https://www.velux.com/api/klf200. It works only with the version 0.2.0.0.71.

Up to the version 0.1.1.0.45 it was possible to access the KLF-200 via the LAN interface. This does not work in version 0.2.0.0.71 anymore. Velux shared on demand with the Lan interface can only be addressed via the API.

Take a look at the technical specification for klf 200 api.pdf

For the latest updates see the CHANGELOG.md

Install

npm install velux-klf200-api

---

Currently tested with API 3.18 from 12.10.2019 version 0.2.0.0.71

---

Current problems

GW_NODE_STATE_POSITION_CHANGED_NTF contains an incorrect timestamp. The lowest 2 bytes of the 4 bytes are sent to the higher 2 bytes and the lowest 2 bytes are 0. In response to the "GW_GET_ALL_NODES_INFORMATION_REQ" command, the correct time stamp is sent: 5be8d806 - 2018-11-12T01: 31: 50.000Z 15 sec Later a "GW_NODE_STATE_POSITION_CHANGED_NTF" hits. This contains a timestamp: d8160000 correct was here 5be8d816

If there is no communication with the KLF every 10 minutes to 15 minutes, the connection will be disconnected as described in the manual. If this happens when the home monitor "GW_HOUSE_STATUS_MONITOR_ENABLE_REQ" is activated, the KLF200 is no longer reachable. The KLF200 no longer sends the TLS command "Change Cipher Spec." on TLS start. This means that TLS encryption can no longer be initiated. I saw these in the wireshark. Should anyone else notice this error, it would be nice if that this someone also reports to the VELUX hotline.

The KLF200 needs more than 3 seconds to connect. It needs more then a second to send the key and more then a second for the TLS command "Change Cipher Spec.".

---

The connect password is the WLAN-Password not the web config password

---

Requirements

• Velux KLF-200 on LAN

---

Debug

This API supported debugging. you have to set the environment variable DEBUG

set DEBUG=velux-klf200-api:*

---

Generate Certificate

The KLF-200 uses a self-signed certificate to secure the TLS protocol. This package contains the fingerprint and certificate that I have extracted from my KLF-200.

In case that your connection doesn't work due to a different certificate you have to extract the certificate from your box with the following command:

$ echo -n | openssl s_client -connect <ip adress of your KLF-200>:51200 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > velux-cert.pem

After extracting the certificate you have to generate the fingerprint with the following command:

$ openssl x509 -noout -fingerprint -sha1 -inform pem -in velux-cert.pem

This will print a fingerprint like 02:8C:23:A0:89:2B:62:98:C4:99:00:5B:D2:E7:2E:0A:70:3D:71:6A.

The fingerprint is not checked by default. But you can check it if you set the fingerprint variable. You can exchange the certificate via the CA variable.

'use strict'
const velux = require('velux-klf200-api')
const fs = require('fs')
velux.fingerprint = '02:8C:23:A0:89:2B:62:98:C4:99:00:5B:D2:E7:2E:0A:70:3D:71:6A'
veluc.CA = fs.readFileSync('velux-cert.pem')

If the fingerprint is not set, it can be queried via velux.fingerprint.

---

Promise

This API works with and without promise. You can use a callback function. If there is no callback function in the call the API create an promise object.

API without Promise

every API callback function is called first with an error object and then eventually a data object. If there is no error, the first parameter is null.

function callback(error,data) {}

'use strict'
const velux = require('velux-klf200-api')

step1()
function step1() {
  velux.connect('10.10.10.15',{},step2)
}
function step2(err) {
  if (err) {
    step5(err)
  }  else {
    velux.login('<some password>',step3)
  }
}
function step3(err,data) {
  if (err) {
    step5(err)
  } else {
    velux.sendCommand({ api: velux.API.GW_GET_VERSION_REQ},step4)
  }
}
function step4(err,data) {
  if (err) {
    step5(err)
  } else {
    console.log('step3:',data)
    velux.sendCommand({ api: velux.API.GW_GET_PROTOCOL_VERSION_REQ},step5)
  }
}
function step5(err,data) {
  if (err) {
    console.log(err)
  } else {
    console.log('step4:',data)
  }
  velux.end(step6)
}
function step6(err) {
  if (err) {
    console.log(err)
  }
}

API with Promise

'use strict'
const velux = require('velux-klf200-api')

velux.connect('192.168.2.15',{})
.then(()=>{
  return velux.login('<some password>')
})
.then((data)=>{
  return velux.sendCommand({ api: velux.API.GW_GET_VERSION_REQ})
})
.then((data)=>{
  console.log('step3:',data)
  return velux.sendCommand({ api: velux.API.GW_GET_PROTOCOL_VERSION_REQ})
})
.then((data)=>{
  console.log('step4:',data)
  return velux.end()
})
.catch((err)=>{
  console.log(err)
  return velux.end()
})

in the API documentation I write the functions like that

(data)=>{}

it's the same as

function (data){}

this is the output if all is correct

step3: { id: 0,
  api: 9,
  apiText: 'GW_GET_VERSION_CFM',
  softwareVersion: [ 0, 2, 0, 0, 71, 0 ],
  hardwareVersion: 6,
  productGroup: 14,
  productType: 3 }
step4: { id: 0,
  api: 11,
  apiText: 'GW_GET_PROTOCOL_VERSION_CFM',
  majorVersion: 3,
  minorVersion: 14 }

---

API functions

connect (host, options ,cb)
login (password, cb)
sendCommand (data, cb)
end (cb)
on (eventName, listener)
off (eventName, listener)
once (eventName, listener)

function: connect

The connect function establishes the connection to the KLF. According to VELUX documentation, only 2 connections are permitted for the KLF.

• host the IP-address of the KLF200
• options an object for future use
• cb the callback function if you don't use promise

It returns an true in data if the API is connected.

function: login

this function executes the login. this must happen before calling another API.

• password the password of the KLF200
• cb the callback function if you don't use promise There is a true in data back when the API is logged in.

this function corresponds to the API call:

sendCommand({ 'api': velux.API.GW_PASSWORD_ENTER_REQ,
              'password': password})

function: sendCommand

This function sends a command to the KLF200 and waits for the answer The request and the answer are always objects. Only API commands that end with 'REQ' can be sent. The answer is always the appropriate confirm. This always ends with 'CFM'

• data the API call with data as object
• cb the callback function if you don't use promise

The construction of the request object

{ api: velux.API.<command>_REQ,
  <dataName>: <value>}

or

{ apiText: '<command>_REQ',
  <dataName>: <value>}

The construction of the answer object

{ id: 0,
  api: <commandNumber>,
  apiText: '<command>_CFM',
  <data>: <value>}

see examples and API below

function: end

The end function closes the connection to the KLF.

• cb the callback function if you don't use promise

functions: on off once

These are the functions for the event emitter. The KLF responds to each request with a confirm. Many data are also sent as a notification. These can only be retrieved via the events. For more information read this

functions

• on register an event
• off deregister an event
• once once an event

parameter

• eventName an API with 'NTF' or an item from the list below
• listener the function which is called if an event is emitted

When a notification arrives, the emitter is called once with 'NTF' and once with the API name. This allows you to react to each notification separately.

current list of notifications

• NTF notification arrived
• notPending a confirm has arrived that could not be assigned to a message
• timeout the socket reports a timeout in the connection
• error the socket reports an error in the connection
• GW_ERROR_NTF Provides information on what triggered the error.
• GW_CS_GET_SYSTEMTABLE_DATA_NTF Acknowledge to GW_CS_GET_SYSTEM_TABLE_DATA_REQList of nodes in the gateways systemtable.
• GW_CS_DISCOVER_NODES_NTF Acknowledge to GW_CS_DISCOVER_NODES_REQ command.
• GW_CS_CONTROLLER_COPY_NTF Acknowledge to GW_CS_CONTROLLER_COPY_REQ.
• GW_CS_CONTROLLER_COPY_CANCEL_NTF Cancellation of system copy to other controllers.
• GW_CS_RECEIVE_KEY_NTF Acknowledge to GW_CS_RECEIVE_KEY_REQ with status.
• GW_CS_PGC_JOB_NTF Information on Product Generic Configuration job initiated by press on PGC button.
• GW_CS_SYSTEM_TABLE_UPDATE_NTF Broadcasted to all clients and gives information about added and removed actuator nodes in system table.
• GW_CS_GENERATE_NEW_KEY_NTF Acknowledge to GW_CS_GENERATE_NEW_KEY_REQ with status.
• GW_CS_REPAIR_KEY_NTF Acknowledge to GW_CS_REPAIR_KEY_REQ with status.
• GW_GET_NODE_INFORMATION_NTF Acknowledge to GW_GET_NODE_INFORMATION_REQ.
• GW_GET_ALL_NODES_INFORMATION_NTF Acknowledge to GW_GET_ALL_NODES_INFORMATION_REQ. Holds node information
• GW_GET_ALL_NODES_INFORMATION_FINISHED_NTF Acknowledge to GW_GET_ALL_NODES_INFORMATION_REQ. No more nodes.
• GW_NODE_INFORMATION_CHANGED_NTF Information has been updated.
• GW_NODE_STATE_POSITION_CHANGED_NTF Information has been updated.
• GW_GET_GROUP_INFORMATION_NTF Acknowledge to GW_GET_NODE_INFORMATION_REQ.
• GW_GROUP_INFORMATION_CHANGED_NTF Broadcast to all, about group information of a group has been changed.
• GW_GET_ALL_GROUPS_INFORMATION_NTF Acknowledge to GW_GET_ALL_GROUPS_INFORMATION_REQ.
• GW_GET_ALL_GROUPS_INFORMATION_FINISHED_NTF Acknowledge to GW_GET_ALL_GROUPS_INFORMATION_REQ.
• GW_GROUP_DELETED_NTF GW_GROUP_DELETED_NTF is broadcasted to all, when a group has been removed.
• GW_COMMAND_RUN_STATUS_NTF Gives run status for io-homecontrol® node.
• GW_COMMAND_REMAINING_TIME_NTF Gives remaining time before io-homecontrol® node enter target position.
• GW_SESSION_FINISHED_NTF Command send, Status request, Wink, Mode or Stop session is finished.
• GW_STATUS_REQUEST_NTF Acknowledge to GW_STATUS_REQUEST_REQ. Status request from one or more io-homecontrol® nodes.
• GW_WINK_SEND_NTF Status info for performed wink request.
• GW_LIMITATION_STATUS_NTF Hold information about limitation.
• GW_MODE_SEND_NTF Notify with Mode activation info.
• GW_INITIALIZE_SCENE_NTF Acknowledge to GW_INITIALIZE_SCENE_REQ.
• GW_RECORD_SCENE_NTF Acknowledge to GW_RECORD_SCENE_REQ.
• GW_GET_SCENE_LIST_NTF Acknowledge to GW_GET_SCENE_LIST.
• GW_GET_SCENE_INFOAMATION_NTF Acknowledge to GW_GET_SCENE_INFOAMATION_REQ.
• GW_SCENE_INFORMATION_CHANGED_NTF A scene has either been changed or removed.
• GW_ACTIVATE_PRODUCTGROUP_NTF Acknowledge to GW_ACTIVATE_PRODUCTGROUP_REQ.
• GW_ACTIVATION_LOG_UPDATED_NTF Confirm line from activation log.
• GW_GET_MULTIPLE_ACTIVATION_LOG_LINES_NTF Error log data from activation log.
• GW_PASSWORD_CHANGE_NTF Acknowledge to GW_PASSWORD_CHANGE_REQ. Broadcasted to all connected clients. see examples below

---

examples

Lists all nodes

'use strict'
const velux = require('velux-klf200-api')

velux.on('NTF',(data)=>{
  console.log(data)
})

velux.connect('192.168.2.15',{})
.then(()=>{
  return velux.login('<some password>')
})
.then((data)=>{
  return velux.sendCommand({ api: velux.API.GW_GET_ALL_NODES_INFORMATION_REQ })
})
.then((data)=>{
  console.log(data)
})
.catch((err)=>{
  console.log(err)
  return velux.end()
})

Let a shutter with node ID 0 wink

'use strict'
const velux = require('velux-klf200-api')

velux.connect('192.168.2.15',{})
.then(()=>{
  return velux.login('<some password>')
})
.then((data)=>{
  return velux.sendCommand({ api: velux.API.GW_WINK_SEND_REQ,
      commandOriginator: 1,
      priorityLevel: 2,
      winkStat: true,
      winkTime: 10,
      indexArrayCount: 1,
      indexArray: [0]
  })
})
.then((data)=>{
  console.log(data)
})
.catch((err)=>{
  console.log(err)
  return velux.end()
})

Moves a shutter with node ID 0 to 100%

'use strict'
const velux = require('velux-klf200-api')

velux.connect('192.168.2.15',{})
.then(()=>{
  return velux.login('<some password>')
})
.then((data)=>{
  return velux.sendCommand({ api: velux.API.GW_COMMAND_SEND_REQ,
      commandOriginator: 1,
      priorityLevel: 2,
      parameterActive: 0,
      functionalParameterMP: {valueType:'RELATIVE', value:100},
      /* functionalParameterMP: 100, */
      indexArrayCount: 1,
      indexArray: [0],
      priorityLevelLock: false,
      lockTime: 0
  })
})
.then((data)=>{
  console.log(data)
})
.catch((err)=>{
  console.log(err)
  return velux.end()
})

The value Object

The value is an Object, you can set the value to an explicit position or to an calculated position. when you set the value you can use either rawValue or value and valueType. It's also possible to use an number instead an Object. Then the API use Relative.

• rawValue is the value as is.
• value is the calculated float value.
• valueType is then kind of the value. have a look: 'Access Method name for Standard Parameter'

Access Method name for |Description                                   |Range (Hex)   |Size (Dec)
Standard Parameter     |                                              |              |
valueType              |value                                         |rawValue      |

RELATIVE               |Relative value (0 – 100%)                     |0x0000–0xC800 |51201
RELATIVE               |No feed-back value known                      |0xF7FF        |1
PERCENT_PM             |Percentage point plus or minus (-100% – 100%) |0xC900-0xD0D0 |2001
TARGET                 |The target value for the parameter            |0xD100        |1
CURRENT                |The current value for the parameter           |0xD200        |1
DEFAULT                |The default value for the parameter           |0xD300        |1
IGNORE                 |Ignore the parameter field where this         |0xD400        |1
                       |Access Method is written                      |              |

License (MIT)

Copyright (c) 2018 Chris Traeger

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.