This 10 minute video walks through step by step building a WiFi device detector and geo-location tracker with no hardware other than a Cisco Meraki wireless access point. If you don't have any Meraki access points, you can use the Meraki DevNet Sandbox.
The Cisco Meraki CMX API uses intelligent access points to deliver real-time location analytics data directly to customers, allowing integration with 3rd-party retail analytics applications, CRM, and custom-built applications. This application show you how to get started using the Cisco Meraki CMX API. CMX (Connected Mobile Experiences) is Cisco’s location analytics and engagement platform, and it’s integrated into Cisco Meraki wireless products.