DNS captive portal example works for android in release 2.0.17, but not in 3.x #10330
Comments
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this issue also plagues many of the countless wifi manager libraries out there. i cannot find a definitive root cause amongst the misinformation. |
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Please set core debug logging to verbose, upload the code, and post a log of the whole transaction (wifi/dhcp/dns/http). I don't have an android 14 device to test. |
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note: i have reason to believe this is a samsung specific issue based on my own testing and what i have read, and does not effect all android deviecs. i am new to the core debug option. before i post the logs from all my devices on both releases, is this all that I should see? i feel like the http raw data should be shown? this is the working version, just to confirm it's the logging you need. ESP-ROM:esp32s2-rc4-20191025 |
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Why is DHCP start set to 0.0.0.0? |
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that's the first thing i tried, making the AP IP 8.8.4.4 like the v2 debug shown. i am not sure why DHCP is showing to 0.0.0.0 but this is the debug that mostly works. the portal is not automatic, but my samsung DOES show a "sign into network" message and clicking it takes you to the portal. that may be as good as it gets. from what i have read, there are reports of mixed results using work around of different private and public IP ranges all over the internet. there could be something to that, but I believe there could be multiple causes since 8.8.4.4 does not seem to work with the newer code. something else is different also. i will post the debug of v3.x now |
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debug from 3.x esp32-core and 3.x DNS captive portal example sketch which is different from 2.x sketch. |
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so i just tried the example in 3.x with an iphone, it does NOT load the portal. |
When running on WiFi-AP mode server's start() method returned true while in fact UDP listening socket was never created Regression introduced in espressif#8760 Closes espressif#10330
Board
esp32-s2 dev module
Device Description
generic, wifi issue, no hardware effected or needed to reproduce
Hardware Configuration
nothing
Version
v3.0.4
IDE Name
arduino 1.8.19
Operating System
win10
Flash frequency
80
PSRAM enabled
no
Upload speed
921600
Description
CaptivePortal.ino example sketch from the DNSServer library, no modifications to code.
working example works in v2.x, meaning a samsung s23 running android 14 will load the captive portal automatically when connecting to the SoftAP. ios also works.
https://github.com/espressif/arduino-esp32/blob/release/v2.x/libraries/DNSServer/examples/CaptivePortal/CaptivePortal.ino
Not Working example in v3.x, meaning a samsung s23 running android 14 will NOT load the captive portal automatically when connecting to the SoftAP. it can be accessed via the browser when forced to stay connected, but not reliable nor a good user experience. ios devices do not have the issue, they work.
https://github.com/espressif/arduino-esp32/blob/release/v3.1.x/libraries/DNSServer/examples/CaptivePortal/CaptivePortal.ino
Note: there have been many documented issues of esp32 captive portals not loading on newer android devices for over 4 years. some work around methods point blame at the use of certain private IPs used for the soft AP of the esp32, and other solutions mention the issue is related to the http responses 200 vs 302, etc.
i am still trying to figure out why this works in v2 and not in v3, but this may be over my head as I am out of ideas. I think having the official example working would benefit many people that may be searching for a solution also.
Sketch
Debug Message
Other Steps to Reproduce
No response
I have checked existing issues, online documentation and the Troubleshooting Guide
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