Telnet Scripting RShell Commands

The Speedway Revolution reader’s Command Line Interface (CLI) is called RShell, it can be accessed after logging into the reader via a serial, Telnet, or an SSH connection. The CLI can be used to configure, maintain and query the status of the RFID reader.

It can be useful to write code which uses RShell commands to configure the reader, essentially Telnet scripting. Below is an example in C# which opens a socket connection to the Speedway Revolution RFID reader and utilizes the CLI.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;
using System.Net;

namespace RshellScripting
{
class Program
{
static Socket socket;
static void Main(string[] args)
{
int count;
string str;
byte[] buffer = new byte[1024];
// Replace READER_HOSTNAME with your reader's host name or IP address 
const string READER_HOSTNAME = "SpeedwayR-10-27-DA.local";

try
{
// Create a new socket
socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);

// Get the IP address of the reader by hostname
IPAddress[] ip = Dns.GetHostAddresses(READER_HOSTNAME);

// Create an IP endpoint using the IP address
IPEndPoint ep = new IPEndPoint(ip[0], 23);

// Connect to the telnet socket on the reader
socket.Connect(ep);

// Wait for the login prompt
str = "";
while (!str.Contains("login:"))
{
count = socket.Receive(buffer);
str = System.Text.Encoding.ASCII.GetString(buffer);
}

// Send the user name
socket.Send(Encoding.UTF8.GetBytes("root\n"));

// Wait for the password prompt
str = "";
while (!str.Contains("Password:"))
{
count = socket.Receive(buffer);
str = System.Text.Encoding.ASCII.GetString(buffer);
}

// Send the password
socket.Send(Encoding.UTF8.GetBytes("impinj\n"));

// Wait for the RShell prompt
str = "";
while (!str.Contains(">"))
{
count = socket.Receive(buffer);
str = System.Text.Encoding.ASCII.GetString(buffer);
}

// Send an RShell command
socket.Send(Encoding.UTF8.GetBytes("show image summary\n"));

// Read the reply
// The first reply is just an echo of our command "show image summary"
// Ignore it
count = socket.Receive(buffer);
// The second reply is the data we want (the result of the command)
count = socket.Receive(buffer);
Console.WriteLine(System.Text.Encoding.ASCII.GetString(buffer,0,count));
}
catch (SocketException ex)
{
Console.WriteLine("A socket exception occurred : " + ex.Message);
}

Console.WriteLine("Press enter to exit");
Console.ReadLine();
}
}
}

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