Add custom event to Azure Event Hub using PowerShell

New-EventHubEvent.ps1

[Reflection.Assembly]::LoadWithPartialName('System.Web') | Out-Null
$HMAC = New-Object System.Security.Cryptography.HMACSHA256

$EventHubsNamespace = ''
$EventHubName       = ''
$EventHubEndpoint   = "$EventHubsNamespace.servicebus.windows.net/$EventHubName"
$AccessPolicyName   = 'RootManageSharedAccessKey'
$AccessPolicyKey    = ''

$SASExpirationTime = ([DateTimeOffset]::Now.ToUnixTimeSeconds()) + 3000
$SignatureString   = [System.Web.HttpUtility]::UrlEncode($EventHubEndpoint) + "`n" + [string]$SASExpirationTime
$HMAC.Key          = [Text.Encoding]::ASCII.GetBytes($AccessPolicyKey)
$Signature         = [Convert]::ToBase64String($HMAC.ComputeHash([Text.Encoding]::ASCII.GetBytes($SignatureString)))
$SASToken          = 'SharedAccessSignature sr=' + [System.Web.HttpUtility]::UrlEncode($EventHubEndpoint) + '&sig=' + [System.Web.HttpUtility]::UrlEncode($Signature) + '&se=' + $SASExpirationTime + '&skn=' + $AccessPolicyName

$Headers = @{
    'Authorization' = $SASToken;
    'Content-Type'  = 'application/atom+xml;type=entry;charset=utf-8';
}
$RestUri = "https://$EventHubEndpoint/messages"

# Body contains a sample JSON object
$Body = @{
    DeviceId    = 'dev-01'
    Temperature = 37
    Elements = @(
        'hot'
        'cold'
    )
} | ConvertTo-Json

Invoke-RestMethod -Uri $RestUri -Method Post -Headers $Headers -Body $Body