Control Nefit boiler - Printable Version

Control Nefit boiler - Printable Version

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+--- Thread: Control Nefit boiler (/showthread.php?tid=6128)

Control Nefit boiler - gjniewenhuijse - 26.09.2025

I like to control a Nefit boiler that has an EMS protocol. Its not possible to control it directly so i inserted an EMS-ESP into my system.

Now i can get data from my system with this script

Code:
--[[

Nefit heat pump ems bus

https://bbqkees-electronics.nl/wiki/gateway/restful-api.html

https://docs.emsesp.org/Commands/

ems-esp/boiler                                        {"cmd":"heatingactivated", "data":"on"}        turn on heatingactivated in boiler

ems-esp/boiler/heatingactivated        {"data":"on"}                                                            turn on heatingactivated in boiler (equivalent to command above)

ems-esp/boiler                                        {"cmd":"dhw.disinfecting", "data":"on"}        turn on DHW disinfecting in boiler

--]]

https = require('ssl.https')

json = require('json')

ltn12 = require('ltn12')

iDebug = true

devIp = '192.168.x.xx' -- ems-esp.local

devUrl = 'http://'..devIp..'/api/'

function getData(iFunction)

  if iDebug then log(devUrl..iFunction) end

  res, code = https.request({

      url = devUrl..iFunction,

      method = 'GET'

  })

  if iDebug then

      log(code, res)

  end

  return code, res

end

function setData(iFunction, iData)

  if iDebug then log(devUrl..iFunction) end

  res, code = https.request({

      url = devUrl..iFunction,

      method = 'POST',

      headers = {["content-type"] = "application/json"},

      data = iData

      })

  if iDebug then

      log(code, res)

  end

  return code, res

end

-- get system info

--getData('system')

-- get boiler info - GET outputs current EMS device information in verbose

--getData('boiler/info')

-- get boiler values - GET outputs current EMS device information in short format

--getData('boiler/values') 

-- get boiler - GET    same as values above

--getData('boiler') 

-- get boiler commands - GET    lists the available command entities to call

--getData('boiler/commands')

-- get boiler entities -     GET    lists all enabled entities

--getData('boiler/entities') 

-- get boiler dhw info

--getData('boiler/dhw/info')

-- get boiler entity heatingactive

--getData('boiler/heatingactive') 

-- thermostaat streeftemperatuur

--getData('thermostat/seltemp')

-- dhw Laden 

--getData('thermostat/dhw/charge') 

setData('thermostat/dhw/charge', '{"value": true}') --curl -X POST http:///api/system/dhw/charge -H "Content-Type: application/json" -d '{"value": true}'

I also like to control the data with the setData function (last line). But i received an error 400. Whats wrong with my code?

Documentation can be found here: https://docs.emsesp.org/Commands/

RE: Control Nefit boiler - admin - 26.09.2025

You are missing Content-Length header for the POST request.

Code:
["Content-Length"] = #iData,

You should use json.encode instead of writing JSON manually to avoid potential errors.

RE: Control Nefit boiler - gjniewenhuijse - 26.09.2025

(26.09.2025, 12:58)admin Wrote: You are missing Content-Length header for the POST request.

Code:
["Content-Length"] = #iData,

You should use json.encode instead of writing JSON manually to avoid potential errors.

Like this (but with same error)?

Code:
setData('thermostat/dhw/charge', {value = true})

function setData(iFunction, iData)

  if iDebug then log(devUrl..iFunction) end

  res, code = https.request({

      url = devUrl..iFunction,

      method = 'POST',

      headers = {["Content-Type"] = "application/json",

                           ["Content-Length"] = #iData

                          },

      data = json.encode(iData)

      })

  if iDebug then

      log(code, res)

  end

  return code, res

end

RE: Control Nefit boiler - admin - 26.09.2025

Try this:

Code:
setData('thermostat/dhw/charge', {value = true})

function setData(iFunction, iData)

  local data = json.encode(iData)

  if iDebug then log(devUrl..iFunction) end

  res, code = https.request({

    url = devUrl..iFunction,

    method = 'POST',

    headers = {

      ["Content-Type"] = "application/json",

      ["Content-Length"] = #data

    },

    data = data

  })

  if iDebug then log(code, res) end

  return code, res

end

RE: Control Nefit boiler - gjniewenhuijse - 26.09.2025

(26.09.2025, 13:13)admin Wrote: Try this:

Code:
setData('thermostat/dhw/charge', {value = true}) function setData(iFunction, iData) local data = json.encode(iData) if iDebug then log(devUrl..iFunction) end res, code = https.request({ url = devUrl..iFunction, method = 'POST', headers = { ["Content-Type"] = "application/json", ["Content-Length"] = #data }, data = data }) if iDebug then log(code, res) end return code, res end

Other error:
* arg: 1
* string: closed
* arg: 2
* nil

RE: Control Nefit boiler - admin - 26.09.2025

Are you sure that URL endpoint and parameters are correct?

RE: Control Nefit boiler - gjniewenhuijse - 26.09.2025

(26.09.2025, 13:27)admin Wrote: Are you sure that URL endpoint and parameters are correct?

getData for that endpoint works and the result is:
* arg: 1
* number: 200
* arg: 2
* string: {"name":"charge","fullname":"dhw Laden","circuit":"dhw","bool":false,"index":0,"value":"uit","type":"boolean","readable":true,"writeable":true,"visible":true}

RE: Control Nefit boiler - admin - 26.09.2025

Send a request to http://<hostname>/api/<device>/commands to get a list of available commands. Do you have access token enabled in Security->Manage Users?

RE: Control Nefit boiler - gjniewenhuijse - 26.09.2025

(26.09.2025, 13:39)admin Wrote: Send a request to http://<hostname>/api/<device>/commands to get a list of available commands. Do you have access token enabled in Security->Manage Users?

Access token is disabled

In the output i need the command: ,"dhw[n].charge":"Laden"

Output:
{"info":"lijst van alle waardes","values":"list all values","commands":"lijst van alle commando's","entities":"lijst van alle entiteiten","[hc<n>.]boost":"boost mode","[hc<n>.]boosttime":"boost time","[hc<n>.]comforttemp":"Comforttemperatuur","[hc<n>.]control":"Afstandsbedieding","[hc<n>.]controlmode":"Comtrolemodus","[hc<n>.]cooloffdelay":"cooling off delay","[hc<n>.]coolondelay":"cooling on delay","[hc<n>.]coolstart":"cooling starttemp","[hc<n>.]cooltemp":"Temperatuur koelbedrijf","[hc<n>.]designtemp":"Ontwerptemperatuur","[hc<n>.]dewoffset":"Offset dauwpunt","[hc<n>.]dhwprio":"Prioriteit warm water","[hc<n>.]ecotemp":"Temperatuur eco","[hc<n>.]fastheatup":"Snel opwarmen","[hc<n>.]heatingtype":"Verwarmingstype","[hc<n>.]heatoffdelay":"heat-off delay","[hc<n>.]heatondelay":"heat-on delay","[hc<n>.]hpcooling":"WP koelbedrijf","[hc<n>.]hpminflowtemp":"Minimale aanvoertemperatuur WP","[hc<n>.]hpmode":"Modus warmtepomp","[hc<n>.]hpoperatingmode":"Bedrijfsmodus warmtepomp","[hc<n>.]instantstart":"instant start","[hc<n>.]intoffset":"Offset interne temperatuur","[hc<n>.]manualtemp":"Temperatuur handmatig","[hc<n>.]maxflowtemp":"Maximale aanvoertemperatuur","[hc<n>.]minflowtemp":"Minimale aanvoertemperatuur","[hc<n>.]mode":"Modus","[hc<n>.]nofrostmode":"Vorstbeveiligingsmodus","[hc<n>.]nofrosttemp":"Temperatuur vorstbeveiliging","[hc<n>.]noreducetemp":"Reduceermodus onderbreken onder","[hc<n>.]offsettemp":"Temperatuur offset","[hc<n>.]program":"Programma","[hc<n>.]redthreshold":"reduction threshold","[hc<n>.]reducemode":"Gereduceerde modus","[hc<n>.]reducetemp":"Onderste afschakeltemperatuur","[hc<n>.]remotehum":"room humidity from remote","[hc<n>.]remotetemp":"Ruimtetemperatuur van afstandsbediening","[hc<n>.]roominflfactor":"Factor ruimteinvloed","[hc<n>.]roominfluence":"Ruimteinvloed","[hc<n>.]roomtempdiff":"Verschiltemperatuur kamertemp","[hc<n>.]seltemp":"Streeftemperatuur kamer","[hc<n>.]solarinfl":"solar influence","[hc<n>.]summersetmode":"Instelling zomerbedrijf","[hc<n>.]summertemp":"Zomertemperatuur","[hc<n>.]switchonoptimization":"Inschakeloptimalisering","[hc<n>.]switchprogmode":"switch program mode","[hc<n>.]tempautotemp":"Streeftemperatuur automodus tijdelijk","absent":"absent","building":"Type gebouw","damping":"Demping buitentemperatuur","datetime":"Datum/Tijd","delayboiler":"Vertragingsoptie","dhw[n].charge":"Laden","dhw[n].chargeduration":"Laadtijd","dhw[n].circmode":"Modus circulatiepomp","dhw[n].dailyheating":"Dagelijks opwarmen","dhw[n].dailyheattime":"Tijd dagelijkse opwarming","dhw[n].disinfectday":"Desinfectiedag","dhw[n].disinfecting":"Desinfectie","dhw[n].disinfecttime":"Desinfectietijd","dhw[n].mode":"Modus","dhw[n].settemp":"Streeftemperatuut","dhw[n].settemplow":"Onderste streeftemperatuur","electricfactor":"Energiefactor electrisch","energycostratio":"Energiekostenratio","fossilefactor":"Energiefactor fossiele brandstof","hybridstrategy":"Hybride strategie","intoffset":"Offset interne temperatuur","minexttemp":"Min. buitentemperatuur","pvenabledhw":"Verhoging WW activeren","pvlowercool":"Verlagen koeling met PV activeren","pvraiseheat":"Verwarmen met PV activeren","solar":"solar","switchovertemp":"Schakeltemperatuur buitentemperatuur","tempdiffboiler":"Verschiltemperatuuroptie"}

RE: Control Nefit boiler - admin - 26.09.2025

Try sending true instead of {value = true}. If this does not help then you should ask this question here: https://github.com/emsesp/EMS-ESP32/discussions

RE: Control Nefit boiler - maxmp - 26.09.2025

Fyi: Theben has an Opentherm to KNX gateway and there is an Opentherm to EMS converter. I have this setup and it works very well.

RE: Control Nefit boiler - gjniewenhuijse - 29.09.2025

(26.09.2025, 21:00)maxmp Wrote: Fyi: Theben has an Opentherm to KNX gateway and there is an Opentherm to EMS converter. I have this setup and it works very well.

Which Openterm to EMS converter do you use?

And can you control the DHW charge? (Extra warm water function)