Telnet

The @std/net/telnet package provides a simple Telnet client.

import telnet from "@std/net/telnet"

const conn = telnet.Telnet("127.0.0.1", 2323)
defer conn.close()

conn.write("ping\n")

const out = conn.read(2000)

println(out)

Import

import telnet from "@std/net/telnet"

Exports

Name	Kind	Description
Telnet	struct	Telnet connection type.

telnet.Telnet

Creates and connects a Telnet client.

Arguments:

Name	Type	Description
host	string	Hostname or IP address.
port	int	TCP port.

Returns: Telnet

import telnet from "@std/net/telnet"

const conn = telnet.Telnet("127.0.0.1", 2323)
defer conn.close()

conn.write

Writes text data to the Telnet connection.

Arguments:

Name	Type	Description
data	string	Data to send.

Returns: void

conn.write("ping\n")

conn.read

Reads one line from the Telnet connection.

Arguments:

Name	Type	Description
timeoutMs	int	Read timeout in milliseconds.

Returns: string

const out = conn.read(2000)

if out != "" {
    println("Telnet got:", out)
}

read waits until a newline is received or until the timeout/deadline is reached.

conn.close

Closes the Telnet connection.

Returns: void

conn.close()

Prefer defer so the connection is closed automatically when the current scope exits.

const conn = telnet.Telnet("127.0.0.1", 2323)
defer conn.close()

Complete Example

import telnet from "@std/net/telnet"

const conn = telnet.Telnet("127.0.0.1", 2323)
defer conn.close()

while true {
    const out = conn.read(2000)

    if out != "" {
        println("Telnet got:", out)
    }

    conn.write("ping\n")
    sleep(1000)
}

Function Syntax Note

Use -> only when describing a function value type.

let reader: fn(int) -> string

When writing a function implementation, put the return type after the parameter list.

fn readOnce(timeoutMs: int) string {
    return conn.read(timeoutMs)
}

For a function that returns nothing, use void.

fn closeConn() void {
    conn.close()
}