React Native

Send an SSH IGNORE Message

Demonstrates the Chilkat Ssh.SendIgnore method, which sends an SSH IGNORE message. It takes no arguments. The server does not reply, but a successful send helps confirm the connection is still writable. No channel is required.

Background: The SSH IGNORE message is discarded by the peer by design; its usefulness is as a lightweight keep-alive or liveness probe. Because it exercises the actual write path, a successful SendIgnore is stronger evidence than CheckConnection that the link is still usable, without side effects on any channel.

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React Native

import { Ssh } from '@chilkat/react-native'

async function chilkatExample() {
  // Demonstrates the Ssh.SendIgnore method, which sends an SSH IGNORE message.  It takes no
  // arguments.  The server does not reply, but a successful send helps confirm the connection is
  // still writable.  No channel is required.

  const ssh = new Ssh();

  // Connect to the SSH server.  Port 22 is the usual SSH port.
  const sshPort = 22;
  try {
    await ssh.connectAsync('ssh.example.com', sshPort);
  } catch {
    console.log(ssh.lastErrorText);
    return;
  }

  // Normally you would not hard-code the password in source.  You should instead obtain it
  // from an interactive prompt, environment variable, or a secrets vault.
  const password = 'mySshPassword';

  try {
    await ssh.authenticatePwAsync('mySshLogin', password);
  } catch {
    console.log(ssh.lastErrorText);
    return;
  }

  // Send an IGNORE message to verify the connection is still writable.
  try {
    await ssh.sendIgnoreAsync();
  } catch {
    console.log(ssh.lastErrorText);
    return;
  }

  console.log('IGNORE message sent.');

  ssh.disconnect();
}