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To my knowledge this cannot be done.
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There should be a way to achieve this
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I want to implement a hot spot for my clients café. He want to give internet free of charge to the café customers but with certain conditions. The customer can use the internet for only 30 mins or for 500MB data cap, whichever reaches first. <br />
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I have installed DD-WRT on a router and using Chillispot but it does not have data capacity. Can you suggest any other way I can achieve that through the router
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I want to implement a hot spot for my clients café. He want to give internet free of charge to the café customers but with certain conditions. The customer can use the internet for only 30 mins or for 500MB data cap, whichever reaches first. 

I have installed DD-WRT on a router and using Chillispot but it does not have data capacity. Can you suggest any other way I can achieve that through the router

Cafe Hotspot Router Flash

Wireless networking is anything related to the transfer of data between two (or more) devices without the use of a physical connection, ranging from getting advice on a new Bluetooth headset to configuring sophisticated enterprise level networks.

Wireless Networking

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.