ESP8266 can't get DHCP IP addres from Asus router

[cniedzi]

Hi,

I have a problem described below. Is there any solution?

Platform

• Hardware: ESP8266-12F
• Core Version: Any higher then 2.5.2
• Development Env: Arduino IDE
• Operating System: Windows 10

Settings in IDE

• Module: Wemos D1 R2 & mini
• Flash Mode:
• Flash Size: 4MB no SPIFFS
• lwip Variant: v2 Lower Memory
• Reset Method:
• Flash Frequency:
• CPU Frequency: 80Mhz
• Upload Using: SERIAL
• Upload Speed: 912600

Problem Description

I use Wemos D1 mini R2 with Arduino core for ESP8266. With any core version higher than 2.5.2 ESP can't get DHCP IP address from ASUS RT-AX86U router (although according to debug data it succesfully connects to wifi).

When I revert back to core 2.5.2 or 2.5.0 ESP sucessfully connects to Asus router and gets IP address. Is it known issue?

Regards

[cniedzi]

Any comment pls?

[TD-er]

Not really a helpful reply from me, but I am quite curious to see an answer, as it is reported often by users of my software too.

[cniedzi]

Any core higher then 2.5.2 is useless with asus routers :( I stay with 2.5.

[TD-er]

Well it seems also to depend on the firmware of those Asus routers, as reported by some. (I don't have Asus routers here)

[cniedzi]

Well it seems also to depend on the firmware of those Asus routers, as reported by some. (I don't have Asus routers here)

Thx. I'll pay attention when new asus' fws will be releasing.

[TD-er]

It was more like downgrade made it work (again), but I have no idea what specific router it was.

[d-a-v]

@cniedzi

Any core higher then 2.5.2 is useless with asus routers :( I stay with 2.5.

With latest release, can you try, in the tools menu:

• 1. to select generic esp8266 board
• 2. then select firmware version "nonos-sdk 2.2.1 (legacy)"
• 3. flash and report

Did you also try to flash OpenWrt on your asus router ?

[cniedzi]

@cniedzi

Any core higher then 2.5.2 is useless with asus routers :( I stay with 2.5.

With latest release, can you try, in the tools menu:

• 1. to select generic esp8266 board
• 1. then select firmware version "nonos-sdk 2.2.1 (legacy)"
• 1. flash and report

Did you also try to flash OpenWrt on your asus router ?

Hi, thx for reply.
nonos-sdk 2.2.1 (legacy) doesn't work for me with the latest release.

I didn't try OpenWrt because I use Mesh system.

Regards

[rolupusoru]

Hi @cniedzi ,

I have an ASUS Rt-AC86U running Merlin firmware. My IoT device runs tasmota wit Arduino Core 2.7.4.9 and I have the same problem with DHCP addresses. I took a trace on the router and I can clearly see that the device ignores the DHCP offer from the router,
sp111_trace_NOK.zip

[d-a-v]

#8319 may fix this issue (follow the links for explanations).
It is not merged yet into master branch but will be soon.
In the meantime, any report about it is welcome (by merging the PR or by using the alpha version 0.0.2 board manager installer for the Arduino IDE).

[movodos]

Having the same issue with tasmota zbridge connecting to a ASUS RT-AX88U running wrt-merlin. The bridge required several manual power cycles after a reboot before it would reconnect to wifi. Following the guide below and another forum post, once "Wi-Fi Agile Multiband" was disabled on the 2.4 band the issue completely dissapeared.

https://www.asus.com/us/support/FAQ/1042475

Setting the IP on the device will probably be a better short term solution but maybe this info will help someone else until the fix above is implemented.

[barbudor]

@movodos we have a test version of Tasmota available with the fix
Please join the discussion and test at arendst/Tasmota#13623

[rolupusoru]

Tasmota 10.0.0.2 test version with #8319 fix did not help. I still have the same DHCP issues on my ASUS router. Trace attached.
esp8266_trace.zip
.