React Native

Bind and Listen on an Available Port in a Range

Demonstrates Socket.BindAndListenPortRange, which searches an inclusive port range for an available TCP port, binds it, and begins listening. It returns the selected port, or -1 on failure.

Background. This is useful when any of several ports is acceptable and the application needs to discover which one was bound.

Chilkat React Native Downloads

Download Chilkat for React Native

React Native

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

async function chilkatExample() {
  const socket = new Socket();

  // Search the inclusive port range for an available TCP port, bind it, and begin listening.  The
  // method returns the selected port, or -1 when no port can be bound.
  const boundPort = await socket.bindAndListenPortRangeAsync(5000, 5100, 25);
  if (boundPort < 0) {
    console.log(socket.lastErrorText);
    return;
  }

  console.log(`Listening on port ${boundPort}`);
}