ESP8266 Drops WiFi N Connection after random time

[gmdriscoll]

*** Platform

• Hardware: ESP-07S
• Core Version: Espressif 8266 (4.0.1) > Espressif Generic ESP8266 ESP-07S
• Development Env: PlatformIO
• Operating System: Windows
• Framework: framework-arduinoespressif8266 @ 3.30002.0 (3.0.2)
• Router: ASUS RT-AX86S Firmware: 3.0.0.4.386_49599 (latest)

*** Problem Description

ESP-07S does not reconnect to router from deepSleep after random amount of time, but generally with 24 hours USING WIFI N. Does not happen with G. DeepSleep is 30seconds to 1 minute. It will not reconnect even with power off. A ROUTER REBOOT is necessary to reset connection fully.

Router Message:
wlceventd: wlceventd_proc_event(530): eth5: Auth [MAC], status: Successful (0), rssi:-49
wlceventd: wlceventd_proc_event(559): eth5: Assoc [MAC], status: Successful (0), rssi:-49
wlceventd: wlceventd_proc_event(511): eth5: Disassoc [MAC], status: 0, reason: (2) Previous authentication no longer valid.
wlceventd: wlceventd_proc_event(494): eth5: Deauth_ind [MAC], status: 0, reason: Disassociated due to inactivity (4), rssi:-51

This happens with the basic example for wifiClient that is provided.

There is no error. WiFi.status() never == WL_CONNECTED.

*** Current resolution

This can be prevented using 3 difference approaches.

1. Router - Suppress bandwidth to 54Mbs.
   A. Set option [Wireless Mode]to [Legacy] - This will limit the bandwidth used with Wireless N to 54Mbs
   B. Set router to allow Wireless B & G ONLY
2. Firmware on ESP8266
   A. Using WiFi.setPhyMode(WIFI_PHY_MODE_11G) will not allow the ESP8266 to connect with Wireless N.

I would like to be able to connect in Wireless N with no connection drops. Wireless N is enabled by default on all new routers and requiring the users to make router changes to allow this device to work is very difficult.

I have not been able to figure out how to limit the bandwidth used while connected using something like in esp idf:
ESP_ERROR_CHECK(esp_wifi_set_bandwidth(WIFI_IF_STA, WIFI_BW_HT20));
This idf command keeps from binding multiple wifi channels to limit the bandwith of Wireless N, but seems to be unavailable in the arduino framework.
I believe this would help my problem, but not actually fix the issue of the random disconnects and no reconnect.

Any info on fixing this issue would be helpful.

Thanks,
-Greg

[gmdriscoll]

I have found other posts with this issue:
#7965
#8412
But there is no "Fix". Setting to MODE G does bypass my problem, but doesn't fix problem in N mode.

[TD-er]

Have you also tried the suggested SDK bin blobs as suggested here: #7965 (comment)
???

[gmdriscoll]

I have not tried the older SDK bin blobs. I have only one AP that I am connecting to at -50db or greater, so not a signal problem per se. But there could be a random weak connection over the 24 hours and it fails on that I suppose. No mesh mode active, just direct router mode with DHCP. Router is in stock default settings. Again, trying to make sure that when this product goes into a new environment it works with no changes to the router like most of the wifi devices we own. I will try the other blobs and see if I can get it to not fail in N mode.

[gmdriscoll]

See latest in #7965