test connectivity of a tcp port

test-tcp.ps1

function test-tcpport {
  param (
  [int]$port = 80,
  [string]$ip = "127.0.0.1"
  )

  try {
    $socket = new-object System.Net.Sockets.TcpClient
    $timespan = [TimeSpan]::FromMilliseconds(500)
    
    if ( ($socket.connectasync($ip, $port)).wait($timespan) ) {
      return $true
    } else {
      return $false
    }
  } catch {
    return $false
  } finally {
    $socket.close() | out-null
    $socket = $null
  }
}