I long to create such and doesn’t know that a software/firmware already existed. This works similar with cafe software that allows internet usage after authentication. Also has the same function as the one used in SMART BRO (broadband) and GLOBE, both of which are leading (coughs) in providing internet service using wi-fi.
To say the least, my theory is right that it should start with an open firmware for router such as the one employed in openwrt (base for COOVA Access Point), dd-wrt, and also many others. Then start with an authentication software like freeradius.
Creating a hotspot authentication software can be daunting when done manually and this saves a lot of time and hair (in my case).
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Updated links as pointed by kurinchi. Thanks!
