title: XBee two-way communication (sender and receiver) at the same time
body: <p>Let's say I am trying to make a chat program like in the YouTube video <em><a href="https://www.youtube.com/watch?v=mPx3TjzvE9U" rel="nofollow">XBee Basics - Lesson 2 - Simple Chat Program Between Two XBees in AT Mode</a></em>.</p>
  
  <p>In this video, he explained that one XBee is a sender which sends "Hello world" to the another XBee using Arduino.</p>
  
  <p>However, is the XBee able to send and receive data at the same time? Are the routers able to communicate to the coordinator and the other way around?</p>
  
  <p>Additionally, I want to write my own software to receive and send data and not using Arduino software. Are there any libraries and APIs?</p>
  
  <p>Articles or videos would be nice.</p>