openDTU - JSON - http post - "no values found"

[cgn]

Hi all,

I'm trying to integrate / control openDTU² into my W4k. I can already read the data from my openDTU. Now I'm trying to write data to my openDTU, which fails. Any idea?

Code:

json = require('json')
http = require('socket.http')

body = json.encode({
    limit_value = '10',
    limit_type = '1',
    serial = '000000000000'
})

resp, code, hdrs, stat = http.request({
  url = 'http://192.168.1.000/api/limit/config',
  method = 'POST',
  headers = {
    ['Authorization'] = 'Basic '..(mime.b64('admin:password')),
    ['Content-Type'] = 'application/json',
    ['Content-Length'] = #body,
  },
  body
})

log(resp, code, hdrs, stat)

I get the following response in the log:

Code:

* arg: 1
  * nil
* arg: 2
  * string: closed
* arg: 3
  * nil
* arg: 4
  * nil

In case it's done; I'll post the full code here. 

²https://www.opendtu.solar/firmware/web_api/#list-of-urls