I would recommend you to read this old post:- Re: ClientContext to ContextHub migration guide

tc82 gave the wonderful answer on ClientContext to ContextHub migration.

ContextHub Implementation

· Table of contents

• Introduction to ContextHub
• Files to be changes to replace CleintContext with ContextHub

Introduction to ContextHub:

• Name  the folder as: contexthub

• Create a folder undern contexthub called modules

• Create a folder undern modules called commerce

• Create a folder undern commerce called clientlib

• Create a file under clientlib named as .content.xml

• Code for the .content.xml

  style="padding-left:45px"

• Add the following line inside the css.txt
  renderer.commerce.css

• Create a file under clientlib named as js.txt

• Add the following line inside the js.txt
  renderer.commerce.js

• Create a file under clientlib named as  renderer.commerce.css

• Add the following line inside the renderer.commerce.css

  style="padding-left:45px"

• Create a folder under above path named: stores

• Create a folder under stores named: commerce

• Create a folder under commerce named: clientlib

• Create a file under clientlib called .content.xml

• Add the following code in the .content.xml

  style="padding-left:45px"

• Add the following code:
  store.commerce.js

• Create a new file under clientlib called store.commerce.js
• Add the followig code:

  style="padding-left:45px"

• Create a folder named customclientcontextlibs

• Create a file .content.xml under customclientcontextlibs folder.
  Add the following code:

  style="padding-left:45px"function callingSatellitePageBottom(){
if (window.ContextHub) {
ContextHub.eventing.on(ContextHub.Constants.EVENT_INITIALIZED + ":XXXX", function(event, data) {
_satellite.pageBottom();
});
}
}

1. Including the CSS and ContextHUb:

<cq:includeClientLib css="cardinalhealth.oe.customclientcontextlibs" /><cq:include path="contexthub" resourceType="granite/contexthub/components/contexthub"></cq:include>

1. Get the COntextHUb Data:

//ContextHub tree details command:
var data = ContextHub.getStore('XXXX').getTree();

Note: XXXX is the store name