feature(wakeup): add basic connectivity test

- add parameters to control or skip connectivity test
- basic connectivity test logic and execution
- simple connectivity error handling and reporting

wakeup.ps1

@@ -14,10 +14,17 @@ param
 # Skip connectivity readiness check
     [Alias("NoCheck", "NoReadiness")]
     [Switch]
-    $ConnectivityCheck = $false,
+    $NoConnectivityCheck = $false,
-# RDP connectivity readiness check timeout
+# Initial wait period in seconds before first connectivity check
     [Int]
-    $Timeout = 300
+    $WaitBeforeConnectivityCheck = 10,
+# connectivity readiness check total timeout
+    [Int]
+    $Timeout = 300,
+# connectivity readiness port to check
+    [Alias("CheckPort")]
+    [Int]
+    $ConnectivityPort = 3389
 )
 
 function exitError($errMessage, $PSItem, $exitCode = 1)
@@ -125,7 +132,49 @@ $removeFromTargetComputers | ForEach-Object {
     $targetComputers.Remove(($targetComputers | Where-Object { $_.name -eq $removeName })) | Out-Null
 }
 
-# process RDP readiness check
+# exit if connectivity check skipped or if no computers to test
-$targetComputers
+if ($NoConnectivityCheck)
+{
+    Write-Host "`r`nSkipping connectivity checks."
+    exitGracefully
+}
+elseif ($targetComputers.Count -eq 0)
+{
+    exitError "No successful wake-up packets sent" -exitCode 5
+}
 
-Exit 0
+# wait for initialWaitTime seconds to let computer(s) wake up
+for ($i = $WaitBeforeConnectivityCheck; $i -gt 0; $i--) {
+    Write-Progress -Activity "Waiting for computer(s) to wake-up..." -SecondsRemaining $i
+    Start-Sleep 1
+}
+Write-Progress -Activity "Waiting for computer(s) to wake-up..." -Completed
+
+# iterate computers and test connectivity
+$targetComputers | ForEach-Object {
+    $name = $_.name
+    $friendlyName = $_.friendlyName
+    $fqdn = -join ($name, $dnsSuffix)
+    $connectionError = ""
+
+    if ( [String]::IsNullOrWhiteSpace($friendlyName))
+    {
+        Write-Host "Testing connection readiness of '$name'... " -NoNewline
+    }
+    else
+    {
+        Write-Host "Testing connection readiness of '$friendlyName'... " -NoNewline
+    }
+    if (!(Test-NetConnection -ComputerName $fqdn -Port $ConnectivityPort -InformationLevel Quiet -WarningAction SilentlyContinue -ErrorAction SilentlyContinue -ErrorVariable connectionError))
+    {
+        Write-Host -ForegroundColor Red "[ERROR]"
+        Write-Host -ForegroundColor Red "`tAdditional information:", $connectionError[-1].ToString()
+    }
+    else
+    {
+        Write-Host -ForegroundColor Green "[OK]"
+    }
+}
+
+# exit gracefully
+exitGracefully