How to simulate a keypress when using ssh and interactive shell

Stuck on keypress

I'm trying to create a script that makes a back-up from a HP proCurve switch. For this I'm using the package golang.org/x/crypto/ssh.

Golang is not new to me and I have quite a bit of "Go" knowledge. But I get stuck after establishing the connection. The switch is asking me to press any key to continue but I don't know how to simulate a keypress. (see image below)

Current code

This is the code that I'm currently using:

package main

import (
    "bufio"
    "fmt"
    "log"
    "net"
    "os"

    "golang.org/x/crypto/ssh"
)

type password string

func main() {

    host := "192.168.2.43:22"
    user := "admin"
    pass := "admin"

    config := &ssh.ClientConfig{
        User: user,
        Auth: []ssh.AuthMethod{
            ssh.Password(pass),
        },
        Config: ssh.Config{
            KeyExchanges: []string{"diffie-hellman-group-exchange-sha1", "diffie-hellman-group1-sha1"},
        },

        HostKeyCallback: ssh.HostKeyCallback(func(hostname string, remote net.Addr, key ssh.PublicKey) error { return nil }),
    }
    conn, err := ssh.Dial("tcp", host, config)
    if err != nil {
        panic("Failed to dial: " + err.Error())
    }
    defer conn.Close()

    // Each ClientConn can support multiple interactive sessions,
    // represented by a Session.
    session, err := conn.NewSession()
    if err != nil {
        panic("Failed to create session: " + err.Error())
    }
    defer session.Close()

    // Set IO
    session.Stdout = os.Stdout
    session.Stderr = os.Stderr
    in, _ := session.StdinPipe()

    // Set up terminal modes
    modes := ssh.TerminalModes{
        ssh.ECHO:          0,     // disable echoing
        ssh.TTY_OP_ISPEED: 14400, // input speed = 14.4kbaud
        ssh.TTY_OP_OSPEED: 14400, // output speed = 14.4kbaud
    }

    // Request pseudo terminal
    if err := session.RequestPty("xterm", 80, 40, modes); err != nil {
        log.Fatalf("request for pseudo terminal failed: %s", err)
    }

    // Start remote shell
    if err := session.Shell(); err != nil {
        log.Fatalf("failed to start shell: %s", err)
    }

    // Accepting commands
    for {

        reader := bufio.NewReader(os.Stdin)
        str, _ := reader.ReadString('\n')
        fmt.Fprint(in, str)

        // Solutition to keypress to continue

        fmt.Fprint(in, " \n")
        fmt.Fprint(in, "show run \n")

    }

}

What I try to achieve

But when I'm pressing any key manually, the script will run all the commands perfectly. So does anyone know how I can simulate any key within the code below:

    for {

        reader := bufio.NewReader(os.Stdin)
        str, _ := reader.ReadString('\n')
        fmt.Fprint(in, str)

        // Solutition to keypress to continue

        fmt.Fprint(in, " \n")
        fmt.Fprint(in, "show run \n")

    }