Control Nefit boiler

[gjniewenhuijse]

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/