Captive portal for MicroPython using ESP32 (WeMos)

A captive portal (system) implemented on MicroPython running on a ESP32 (WeMos board)

Mauro Riva

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Description

There is more than one way to implement a captive portal. I used the &quot;redirect by DNS&quot;. Every time a client requests a website, a DNS query is started. I implemented a DNS server that answers all the DNS lookups returning the IP address of the ESP32 and thus, as a result, the captive portal page. Moreover, the message &quot;connect to a network&quot; or &quot;sign in to a network&quot; appears. 

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Project Components

WeMos WiFi ESP32 Development Tool	x 1	buy
INR18650 3.7v Battery	x 1	buy buy
MicroPython		download tutorial
uPyPortal		download

Portal optimization is required! This is only a sample and a very beta code. The portal is far away from stable :S, but it works.

Build Instructions

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1

Get the required hardware.

Check the component list
2

Install MicroPython on the ESP32.

You need a nightly version greater than esp32-20171031 (31 Oct. 2017)! Versions older than this one have a problem with the DNS address of the access point (see here). A tutorial to install MicroPython on the ESP32 can be found here.
3

Using the PyMark console, connect the WeMos to the Internet.

Install the captive-portal dependencies (picoweb, micropython-logging, utemplate, micropython-pkg_resources, micropython-btreedb). I included the file `setup_sta_upip.py`. You need to change the `your_ssid`, and the `wpa2_password` to the corresponding of your network and execute the file on the PyMark console (click on the run button).