Hi Thomas,

The error "Unexpected end of MIME multipart stream. MIME multipart message is not complete." usually means your content length value does not accurately reflect the length of your Body. 

There are also a few things in your body I don't think you need. I have a Powershell Script that does a similar thing. Here is an excerpt:

 $headers = @{}
 $headers["Authorization"] = "Bearer " + $script:AccessToken
 
 # Grab the Device Family from parameters and put it in a Hash table
 $DevFamily = @{}
 $DevFamily["deviceFamily"] = $DeviceFamily
 
 # I need the filename
 $FileName = Split-Path -leaf $FilePath
 
 # Grab the file and encode it to base64
 $Base64EncodedFile = [Convert]::ToBase64String([IO.File]::ReadAllBytes($FilePath))

 # Create the Body... I need a better way to do this. I'm appending variables to the body as needed

 $Body = @' 
--mobicontrol_boundary
Content-Type: application/vnd.soti.mobicontrol.package.metadata+json


'@

 $Body = $Body + ($DevFamily | ConvertTo-Json)

 $Body = $Body + @'

--mobicontrol_boundary
Content-Type: application/vnd.soti.mobicontrol.package
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename=
'@

 $Body = $Body + '"' + $FileName + '"'

 $Body = $Body + "`r`n`r`n"

 $Body = $Body + $Base64EncodedFile

 $Body = $Body + @'

--mobicontrol_boundary--
'@
 
 try
 {
 $result = Invoke-restmethod -Uri "https://$script:ServerFQN/mobicontrol/api/packages" -ContentType "multipart/related; boundary=mobicontrol_boundary" -Method POST -Headers $headers -body $body 
 }
 catch
 {
 $_.Exception.Message
 }
 

I've found that spacing matters in the body as well. Not having newline characters in the right place in your body will result in an invalid request error.

Hi Thomas 

Thanks, T J for sharing the Power shell excerpt.

Can you please share if the Powershell Script excerpt shared by T J worked for you?

Regards

Hi all

@TJ: Thank you very much for sharing your Powershell Script.

I could not do any additional testing this week and I am on holidays next week. I'll give it another try when I am back and will report my results here.

Best regards and thank you all

Thomas

Hi everyone

Sorry for my late feedback.

I finally got it working with the help of TJs Powershell script. My fault was to use Python and assume that the line endings do not really matter... Well, they do. Python uses '\n' as line endings, and the resulting Content-Length did not match with MobiControls expectation.

By explicitly using Windows line endings, I got it working.

Thanks for your help!