Problem Auslesen einer Internetseite mit Powershell

# Helperfunctions
function md5([string]$string){
    [System.BitConverter]::ToString([System.Security.Cryptography.MD5]::Create().ComputeHash((new-object System.Text.UnicodeEncoding).GetBytes($string))).replace('-','').toLower()  
}

function Get-SessionID([string]$url,[string]$user,[string]$pass){
    $xml = irm -Uri "$url/login_sid.lua" -SessionVariable sess -ContentType "application/xml"  
    $sid = $xml.SessionInfo.SID 
    if ($sid -eq '0000000000000000'){  
        $challenge = $xml.SessionInfo.Challenge
        # Response berechnen
        $response = "$challenge-$((md5 "$challenge-$password").Substring(0,32))"  
        $xml = irm -Uri "$login_url/login_sid.lua" -WebSession $sess -Body @{response=$response;username=$user}  
        $sid = $xml.SessionInfo.SID
    }
    return $sid
}

function Get-PageData([string]$url,[string]$sid,[hashtable]$parameters = @{}){
    $body = $parameters;$body.sid = $sid
    $r = Invoke-WebRequest -Uri $url -Body $body -Method Get
    return $r.Content
}

$fboxurl = 'http://fritz.box'  
$username = ''  
$password = 'GEHEIM'  

# Login durchführen / SID holen
$sid = Get-SessionID -url $fboxurl -user $username -pass $password


# Übersicht
$data = Get-PageData "$fboxurl/data.lua" -sid $sid -parameters @{page='overview';type='all'} | ConvertFrom-Json  
$data.data

# Internet > DSL-Informationen > Übersicht
# Get-PageData "$fboxurl/internet/dsl_overview.lua" -sid $sid -parameters @{useajax=1;action='get_data'} | ConvertFrom-Json 

# Telefonbuch
# Get-PageData "$fboxurl/fon_num/fonbook_list.lua" -sid $sid 

# Internet > Online-Monitor > Internet-Statistik "Tabelle" 
#Get-PageData "$fboxurl/internet/inetstat_monitor.lua" -sid $sid -parameters @{useajax=1;action='get_table'} 

# Internet > Online-Monitor > Internet-Statistik "Grafikdaten" 
# Get-PageData "$fboxurl/internet/inetstat_monitor.lua" -sid $sid -parameters @{useajax=1;action='get_graphic'} | convertfrom-JSON 

# Internet > Online-Monitor > Online-Zähler
# Get-PageData "$fboxurl/data.lua" -sid $sid -parameters @{page='netCnt'} 

# Internet > Zugangsdaten > Internetzugang
# Get-PageData "$fboxurl/internet/internet_settings.lua" -sid $sid 

# Internet > DSL-Informationen > DSL
# Get-PageData "$fboxurl/internet/dsl_stats_tab.lua" -sid $sid -parameters @{update='mainDiv'} 

# Telefonie > Anrufe
# Get-PageData "$fboxurl/data.lua" -sid $sid -parameters @{page='dialLi'} 

# Heimnetz > Heimnetzübersicht
# Get-PageData "$fboxurl/net/network.lua" -sid $sid 

# System > Ereignisse
# $raw = Get-PageData "$fboxurl/system/syslog.lua" -sid $sid -parameters @{update='uiEventTable';event_filter=0} 
# [regex]::Matches($raw,'(?is)datalabel="([^"]+)".*?<a target[^>]+>(.*?)</a>').Captures | select @{n="Datum";e={get-date $_.Groups[1].Value}},@{n="Message";e={$_.Groups[2].Value}} | ft -AutoSize