Http POST body

[CristianAgata]

Hi @ all,
I need a little help for send a body in a script. I don't know way, if i send it via Postman it works and if I try via script, the answer it is 422 (error in body compose).
This is my script:

Code:

https = require('ssl.https')
json = require('json')
ltn12 = require('ltn12')
--local body = {}
test = '{"commands":{["component":"main","capability":"switch","command":"on"]}}' --body json
--log(test)
token = 'xxxxxxxxxxxxxxxxxxxxxx' --token auth
tbl = {}

res, code,headers, status = https.request({
  url = 'https://api.smartthings.com/v1/devices/--devices ID--/commands',
  method = 'POST',
  headers = {
    ['authorization'] = 'Bearer ' ..token,
    ['content-type']  = 'application/json',
    ['content-length'] = #test,
  },
  sink = ltn12.sink.table(tbl),
    log(sink),
  source = ltn12.source.string(test),
    log(source)
})

if res and code == 200 then
  resp = table.concat(tbl)
  resp = json.pdecode(resp)

  -- This lists a Table with all your information: 
  log(resp)
else
  log(res, code)
end