Powershell access HTML frames - html

Question

I've been trying to create a powershell script to automate something in my router's website but I can't really navigate through the sites frames and framesets, any help would be greatly appreciated!
$ie = New-Object -ComObject 'internetExplorer.Application'
$ie.Visible= $true # Make it visible
$ie.Navigate("http://192.168.1.1")
While ($ie.Busy -eq $true) {Start-Sleep -Seconds 3;}
$usernamefield = $ie.document.getElementByID('userName')
$usernamefield.value = "admin"
$passwordfield = $ie.document.getElementByID('pcPassword')
$passwordfield.value = "admin"
$Link = $ie.document.getElementByID('loginBtn')
$Link.click()
$Frame1a = $ie.document.getElementByID("topFrame")
$Frame2a = $Frame1a.contentWindow
$Frame3a = $Frame2a.document
$Frame1b = $Frame3a.getElementByID('bottomLeftFrame')
$Frame2b = $Frame1b.contentWindow
$Frame3b = $Frame2b.document
$thing = $Frame3b.getElementsByTagName('a') | where-object {$_.innerText -eq 'Wireless'}
This is the code I have so far, but when it gets to $Frame1b = $Frame3a.getElementByID('bottomLeftFrame') I get an error message saying: "You cannot call a method on a null-valued expression."
After I get this frame thing to work, I'd need it to click a hyperlink, if anyone knows how to do that please tell me, I've tried before but it didn't work. I've also tried different languages before, python, VBS, but I got the furthest with powershell.
Thanks for the attention!

Answer 1

I had similar issue in the past. I solved it like this:
$ie = New-Object -ComObject 'internetExplorer.Application'
$ie.Visible= $true # Make it visible
$ie.Navigate("http://192.168.1.1")
While ($ie.Busy -eq $true) {Start-Sleep -Seconds 3;}
$usernamefield = $ie.document.getElementByID('userName')
$usernamefield.value = "admin"
$passwordfield = $ie.document.getElementByID('pcPassword')
$passwordfield.value = "admin"
$Link = $ie.document.getElementByID('loginBtn')
$Link.click()
start-Sleep -Milliseconds 500
#Click Wireless
$oFrameLeft=$ie.document.parentwindow.frames['bottomLeftFrame'].document
$oWireless = $oFrameLeft.IHTMLDocument3_getElementsByTagName('a') | where-object {$_.innerText -eq 'Wireless'}
$oWireless.click()