Powershell TCP Send and Receive response - powershell

Question

I am using a PowerShell TCP listener accept a connection then send and receive over that connection.
I need to send:
$Ret = 0x02 + [string]"LS$(Current)" + 0x03
So an 0x02 start and 0x03 end but I cannot get it into a variable to use a:
$writer.Write($Ret)
$writer.Flush()
To transmit it over TCP
Any suggestions would help.
#Current function
Function Current {
$Now = Get-Date -format "yy:MM:dd:HH:mm:ss"
$IM = $Now -split ":"
$P1 = "|DA" + $IM[0] + $IM[1] + $IM[2]
$P2 = "|TI" + $IM[3] + $IM[4] + $IM[5] + "|"
$P3 = $P1 + $P2
Return $P3
}
$continue = $true
$port = 8471
$IPEndPoint = New-Object System.Net.IPEndPoint([IPAddress]::Any,$port)
$listener = New-Object System.Net.Sockets.TcpListener $IPEndPoint
$listener.Start()
[Byte] $B1 = 0x02
[Byte] $B2 = 0x03
while ($continue -eq $true) {
$data = $Null
$client = $listener.AcceptTcpClient()
$rEndpoint = $client.client.RemoteEndPoint
$stream = $Client.GetStream()
$client.NoDelay = $True
#Stream Prep
$reader = New-Object System.IO.StreamReader $stream
$writer = New-Object System.IO.StreamWriter $Stream
$writer.AutoFlush = $true
If($client.Connected -eq $false) {
"Not Connected"
}
$buffer = new-object System.byte[] 1024
$EncodedText = new-object System.Text.AsciiEncoding
If ($client.Connected -and $Count -lt 1) {
$R1 = "LS$(Current)"
$Ret = 0x02 + [string]"LS$(Current)" + 0x03
$writer.Write($Ret)
$writer.Flush()
Write-Host $Ret
$Count++
}
while ($client.Connected -and $stream.DataAvailable -and ($i = $stream.Read($buffer, 0, $buffer.Length)) -ne 0) {
$data += $EncodedText.GetString($buffer, 0, $i)
$stream.Flush()
}
If($Data -eq $null) {
$Data = $Reader.ReadLine()
}
Write-Host "$rEndpoint`: $data"
# Get-Variable -Name data
If($data -eq "StopIt") {
$stream.Close()
$client.Close()
$continue = $false
$listener.stop()
$Client.Close()
$stream.Close()
$listener.stop()
$reader.Close()
$writer.Close()
} ElseIf($data -match "LS") {
$Ret = "'\x02LS$(Current)\x03'"
$writer.WriteLine($Ret)
Write-Host $Ret
} ElseIf($data -match "x02LA") {
$Ret = "\x02LA$(Current)\x03"
$writer.Write($Ret)
Write-Host $Ret
} ElseIf($Data -eq $Null) {
$Data
"Not"
# $Ret = "'\x02LS$(Current)\x03'"
# $writer.WriteLine($Ret)
# Write-Host $Ret
} ElseIf($Data -match "DR") {
$Data
Write-host "DR Request"
# Resenc query to database
} ElseIf($Data -match "PS") {
$Data
Write-host "PS Request"
# Room paid query
} Else {
$Data
Write-host "Other Request"
}
$Reader.Close()
$writer.Close()
$stream.Close()
$client.Close()
start-sleep -Milliseconds 500
}
In Python it looks like this:
s = 'LS|DA220601|TI195645|'
m = b'\x02' + s.encode('ascii') + b'\x03'
Need to send the same thing over a TCP connection with PowerShell.
Thanks
Peter

Answer 1

$port=8471
$IPEndPoint=New-Object System.Net.IPEndPoint([IPAddress]::Any,$port)
$listener = New-Object System.Net.Sockets.TcpListener $IPEndPoint
$listener.Start()
$data = $Null
$client = $listener.AcceptTcpClient()
$rEndpoint = $client.client.RemoteEndPoint
$client.NoDelay = $True
$PS=$Client.GetStream()
#((0x02) -as [byte[]];$([System.Text.Encoding]::ASCII.GetBytes($Ret));(0x03) -as
byte[]])
$PS.Write($data1,0,$data1.Length)
$PS.Flush()
The above fixed it. Thanksall.
Peter