[SYNC issue] workaround for FritzBox external IP change by ISP

[Daniel-1276]

Below you can find a powershell script that checks FritzBox router for changing external IP address and restarts "farmer, harvester,full node, and the wallet" in order regain blockchain SYNC as GUI client is unable to by itself. I have postet this already, but as the issue got closed i was unable to update the code.
Script was testet against a FritzBox 7530 but should work with all modern models.

Best practice is to copy/paste script into MyChiaScript.ps1 file and start the execution by right-clicking it and choose "start with powershell".

function check-fritzbox{
param (
	[String] $URL = "http://192.168.178.1:49000/igdupnp/control/WANIPConn1"
)

$soapWebRequest = [System.Net.WebRequest]::Create($URL) 
$soapWebRequest.Headers.Add("SOAPAction","urn:schemas-upnp-org:service:WANIPConnection:1#$action")


$soapWebRequest.ContentType = 'text/xml;charset="utf-8"'
$soapWebRequest.Accept      = "text/xml" 
$soapWebRequest.Method      = "POST" 

$requestStream = $soapWebRequest.GetRequestStream() 
[string]$SOAPRequest='<?xml version="1.0" encoding="utf-8"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<s:Body>
  <u:${action} xmlns:u=urn:schemas-upnp-org:service:WANIPConnection:1 />
</s:Body>
</s:Envelope>';

$SOAPRequestbytearray = ([system.Text.Encoding]::ASCII).GetBytes($SOAPRequest)
$requestStream.write($SOAPRequestbytearray,0,$SOAPRequestbytearray.count)
$requestStream.Close() 

$resp = $soapWebRequest.GetResponse() 
$responseStream = $resp.GetResponseStream() 
$soapReader = [System.IO.StreamReader]($responseStream) 
$ReturnXml = [Xml] $soapReader.ReadToEnd() 
$responseStream.Close()

$action=$action+"Response"
#$ip=$ReturnXml.Envelope.Body.$actionResponse|foreach { $_.NewExternalIPAddress }
$result=$ReturnXml.Envelope.Body.$action
return $result
}


# Get initial external IP an connection status
${action}="GetStatusInfo"
$DSLstatus=check-fritzbox|foreach { $_.NewConnectionStatus }

${action}="GetExternalIPAddress"
$currentIP=check-fritzbox|foreach { $_.NewExternalIPAddress }
$lastIP=$currentIP


# VARIABLES
$localappdata=$env:LOCALAPPDATA
$chiapath="chia-blockchain\app-1.1.5\resources\app.asar.unpacked\daemon"


if (Test-Path -Path $localappdata\$chiapath\chia.exe){
write-host "Path to chia.exe checked and valid"
}else{
write-host "Path to chia.exe NOT valid !"
write-host "Path used in script: $localappdata\$chiapath\chia.exe"
write-host "Pleas check and correct section [VARIABLES] in powershell script"
pause
exit
}
write-host ""
write-host "Your current DSL connection status:  $DSLstatus"
write-host "Your current FritzBox external IP:   $currentIP"
write-host ""
write-host "Start monitoring " -NoNewline

while($true){
    ${action}="GetStatusInfo"
    $DSLstatus=check-fritzbox|foreach { $_.NewConnectionStatus }


	if($DSLstatus -eq "Connected"){
		${action}="GetExternalIPAddress"
                $currentIP=check-fritzbox|foreach { $_.NewExternalIPAddress }
	}
	if ($currentIP -ne $lastIP){
		cls
		write-host "IP change detected !"
		write-host "Old IP: $lastIP New IP: $currentIP"
		$lastIP = $currentIP

                write-host "Restarting chia client now ..."
		start-process $localappdata\$chiapath\chia.exe -argumentlist "start farmer -r"

		write-host ""
		write-host "Start monitoring " -NoNewLine
	}
    write-host "." -NoNewline
    Start-Sleep -Seconds 30
}