How to send data to EventHub using Powershell

Hi Expert,

I struggled to send data to an EventHub using Powershell. I hope someone can help me.

First: documentation here from MSbut i think I really did not understand ;(

Second: below the code I used

#################################
# API method
$method = "POST"

# API header
$headers = @{
            "Authorization"="SharedAccessSignature sr={my namespace here}.servicebus.windows.net&sig={my key here}&se=1444603552&skn=RootManageSharedAccessKey";"Content-Type"="application/atom+xml;type=entry;charset=utf-8";"Host"="{my name space here}.servicebus.windows.net";"ContentLength" = "42"
            }

# generate the API URI
$URI = "https://{my namespace here}.servicebus.windows.net/{my event hub name here}/messages?timeout=60&api-version=2014-01 HTTP/1.1"



# create Request Body - What i missed here ???
# $body = { "DeviceId":"dev-01", "Temperature":"37.0" }


# execute the Azure REST API
Invoke-RestMethod -Uri $URI -Method $method -Headers $headers -Body $body 

On computer i added my azure account and already import azure published settings.

Problem: i always get error 401 Remote server  not authorized.

Did you experience such error ? Maybe you will catch quickly what i missed or typed wrong.

Regards,

Terry