Invoke-Webrequest click a button and continue with a session variable - powershell

Question

I'm trying to log into my printers to grab logs from them and parse them with powershell.
The logon box isn't a FORM, it's an unordered list containing INPUT textboxes.
So I have managed to select the PIN textbox and give it the correct value.
I have also managed to get a hold of the button I have to click, but now my problem is, I need to click that button and declare a SessionVariable so I can continue with that session once the button is clicked and I'm logged in.
How do I properly click this button? I'm trying this but it's not working:
$Page = Invoke-WebRequest -Uri "http://xxx/webglue/content?c=LoginDropdown&lang=fr"`
-Headers #{"Pragma"="no-cache"; "Accept-Encoding"="gzip, deflate"; "Accept-Language"="fr-FR,fr;q=0.9,en-US;q=0.8,en;q=0.7"; "User-Agent"="Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.100 Safari/537.36"; "Accept"="application/json, text/javascript, */*; q=0.01"; "Cache-Control"="no-cache"; "X-Requested-With"="XMLHttpRequest"; "Cookie"="lang=fr; autoLogin=false"; "Referer"="http://xxx/"}`
-ContentType "application/x-www-form-urlencoded; charset=utf-8"`
-SessionVariable "SESSION"
$TextboxPIN = $page.ParsedHtml.body.getElementsByTagName('input') | Where-Object {$_.OuterHTML -match "pin"}
$TextboxPIN.value = "xxx"
$ConnectionButton = $page.ParsedHtml.body.getElementsByTagName('button') | Where-Object {$_.onclick -like "*login(this)*"}
Invoke-WebRequest -Uri ("http://xxx/webglue/content?c=LoginDropdown&lang=fr"+ $ConnectionButton.click() ) -Method POST -Body $ConnectionButton -SessionVariable "ADMIN"
This doesn't work for now because i'm not properly logged in since I can't click the button correclty with POST
Invoke-WebRequest -uri "http://xxx/cgi-bin/history" -WebSession $ADMIN
That http:// PRINTER-IP/webglue/content?c=LoginDropdown&lang=fr"+ $BoutonConnexion.click() is based on how it's done with forms but i'm sure it's wrong in this case. How to properly click it?

Answer 1

After trying a lot of different things, none worked, here is how I ended up getting it working. It's not pretty but it works well and takes just a few seconds to extract all the logs, which I can then parse later.
This is for a Lexmark MS621n printer but could be adapted to other Lexmark printers.
This dumps all the log files I found of interest:
$Printer = "IPofPrinter"
$ie = New-Object -ComObject 'InternetExplorer.Application'
$ie.visible = $true
$ie.navigate("http://$printer")
do {start-sleep -m 100} until ($ie.ReadyState -eq 4)
$Menu = $ie.document.IHTMLDocument3_getElementById("loginclickarea")
$menu.Click()
start-sleep 1
$pin = $ie.document.IHTMLDocument3_getelementsbytagname("input") | Where-Object {$_.OuterHTML -match "pin"}
$pin.focus()
$wshell = New-Object -ComObject wscript.shell
$wshell.SendKeys("XXXXX")
$btn = $ie.document.IHTMLDocument3_getelementsbytagname("button") | Where-Object {$_.OuterHTML -like "*login(this)*"}
$btn.Click()
do {start-sleep -m 100} until ($ie.ReadyState -eq 4)
$ie.navigate("http://$printer/cgi-bin/enginedebugdata")
do {start-sleep -m 100} until ($ie.ReadyState -eq 4)
$ie.Document.documentElement.innerHTML > C:\TEMP\$($printer)_enginedebugdata.log
$ie.navigate("http://$printer/cgi-bin/eventlog_se")
do {start-sleep -m 100} until ($ie.ReadyState -eq 4)
$ie.Document.documentElement.innerHTML > C:\TEMP\$($printer)_eventlog.log
$ie.navigate("http://$printer/cgi-bin/history")
do {start-sleep -m 100} until ($ie.ReadyState -eq 4)
$ie.Document.documentElement.innerHTML > C:\TEMP\$($printer)_history.log
$ie.navigate("http://$printer/cgi-bin/se_net_details")
do {start-sleep -m 100} until ($ie.ReadyState -eq 4)
$ie.Document.documentElement.innerHTML > C:\TEMP\$($printer)_se_net_details.log
$ie.navigate("http://$printer/cgi-bin/netsetuppg")
do {start-sleep -m 100} until ($ie.ReadyState -eq 4)
$ie.Document.documentElement.innerHTML > C:\TEMP\$($printer)_netsetuppg.html
$ie.Stop()
$ie.Quit()