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[admin]

Try this, I've tested it with nginx and apache so other servers might reject this request. Fill params table with your post arguments, filedata variable should contain binary data of your jpeg image, set request url as needed.

Code:

require('ssl.https')

boundary = os.date('%d%m%Y%H%M%S')

params = {
  {
    name = 'token',
    value = '12345',
  },
  {
    name = 'user',
    value = 'testuser',
  },
  {
    name = 'attachment',
    filename = 'snapshot.jpg',
    ctype = 'image/jpeg',
    value = filedata,
  }
}

body = { '--' .. boundary }

for _, param in ipairs(params) do
  line = string.format('Content-Disposition: form-data; name=%q', param.name)
  if param.filename then
    line = string.format('%s; filename=%q', line, param.filename)
  end
  body[ #body + 1 ] = line

  if param.ctype then
    body[ #body + 1 ] = string.format('Content-Type: %s', param.ctype)
  end

  body[ #body + 1 ] = ''
  body[ #body + 1 ] = param.value
  body[ #body + 1 ] = '--' .. boundary
end

-- last boundary
body[ #body ] = body[ #body ] .. '--'
-- empty line at the end
body[ #body + 1 ] = ''

bodydata = table.concat(body, '\r\n')

resp = {}

log(
  ssl.https.request({
    url = 'https://...',
    sink = ltn12.sink.table(resp),
    method = 'POST',
    source = ltn12.source.string(bodydata),
    headers = {
      ['content-length'] = #bodydata,
      ['content-type'] = 'multipart/form-data; boundary=' .. boundary
    }
  })
)

log(table.concat(resp))