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[GH-ISSUE #1209] AP Does Not Respect Bandwidth Directive #1031

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opened 2026-02-28 01:28:12 +03:00 by kerem · 6 comments

kerem commented

2026-02-28 01:28:12 +03:00

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Originally created by @lbussy on GitHub (Feb 10, 2021).
Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/1209

Basic Infos

Hardware

WiFimanager Branch/Release: Master (I don't see a "development" branch in the list)

Esp32:

Hardware: ESP32-WROOM-32

Core Version: v3.2.3-14-gd3e562907

Description

When AP mode starts, it starts with 40MHz bandwidth and multiple channels. When I set the bandwidth and channel the code does not seem to respect the setting as determined by a spectrum analyzer:

Settings in IDE

Module: Lolin D32

Additional libraries: N/A

Sketch

#include <Arduino.h>
#include <WiFiManager.h>

void setup()
{
    Serial.begin(BAUD);
    Serial.setDebugOutput(true);
    Serial.flush();
    Serial.println();

    WiFiManager wm;
    wm.setDebugOutput(true);
    wm.debugPlatformInfo();
    wm.resetSettings();

    wm.setCountry("US");
    wm.setWiFiAPChannel(1);

    esp_wifi_set_bandwidth(WIFI_IF_AP, WIFI_BW_HT20);

    if (!wm.autoConnect("AutoConnectAP"))
    {
        Serial.println("Failed to connect.");
    }
    else
    {
        Serial.println("Connected.");
    }
}

void loop() {}

Debug Messages

*WM: [1] Free heap:        317176
*WM: [1] ESP SDK version:  v3.2.3-14-gd3e562907
*WM: [1] resetSettings
*WM: [1] SETTINGS ERASED
*WM: [1] AutoConnect
*WM: [1] No Credentials are Saved, skipping connect 
*WM: [2] Starting Config Portal
*WM: [2] Disabling STA
*WM: [2] Enabling AP
*WM: [1] StartAP with SSID:  AutoConnectAP
*WM: [2] Starting AP on channel: 1
*WM: [2] AP has anonymous access! 
*WM: [1] AP IP address: 192.168.4.1
*WM: [2] WiFiSetCountry to US
*WM: [2] [OK] esp_wifi_set_country:  US
*WM: [1] Starting Web Portal
*WM: [2] HTTP server started
*WM: [2] Config Portal Running, blocking, waiting for clients...

Originally created by @lbussy on GitHub (Feb 10, 2021). Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/1209 ### Basic Infos #### Hardware WiFimanager Branch/Release: Master (I don't see a "development" branch in the list) Esp32: Hardware: ESP32-WROOM-32 Core Version: v3.2.3-14-gd3e562907 ### Description When AP mode starts, it starts with 40MHz bandwidth and multiple channels. When I set the bandwidth and channel the code does not seem to respect the setting as determined by a spectrum analyzer: ![Bandwidth](https://user-images.githubusercontent.com/9092188/107509612-69c1a000-6b68-11eb-9b7a-f2e2bf0372e5.JPG) ![Channels](https://user-images.githubusercontent.com/9092188/107509618-6c23fa00-6b68-11eb-81e5-90933a3151d7.JPG) ### Settings in IDE Module: Lolin D32 Additional libraries: N/A ### Sketch ```cpp #include <Arduino.h> #include <WiFiManager.h> void setup() { Serial.begin(BAUD); Serial.setDebugOutput(true); Serial.flush(); Serial.println(); WiFiManager wm; wm.setDebugOutput(true); wm.debugPlatformInfo(); wm.resetSettings(); wm.setCountry("US"); wm.setWiFiAPChannel(1); esp_wifi_set_bandwidth(WIFI_IF_AP, WIFI_BW_HT20); if (!wm.autoConnect("AutoConnectAP")) { Serial.println("Failed to connect."); } else { Serial.println("Connected."); } } void loop() {} ``` ### Debug Messages ``` *WM: [1] Free heap: 317176 *WM: [1] ESP SDK version: v3.2.3-14-gd3e562907 *WM: [1] resetSettings *WM: [1] SETTINGS ERASED *WM: [1] AutoConnect *WM: [1] No Credentials are Saved, skipping connect *WM: [2] Starting Config Portal *WM: [2] Disabling STA *WM: [2] Enabling AP *WM: [1] StartAP with SSID: AutoConnectAP *WM: [2] Starting AP on channel: 1 *WM: [2] AP has anonymous access! *WM: [1] AP IP address: 192.168.4.1 *WM: [2] WiFiSetCountry to US *WM: [2] [OK] esp_wifi_set_country: US *WM: [1] Starting Web Portal *WM: [2] HTTP server started *WM: [2] Config Portal Running, blocking, waiting for clients... ```

kerem

2026-02-28 01:28:12 +03:00

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kerem commented

2026-02-28 01:28:13 +03:00

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@tablatronix commented on GitHub (Feb 10, 2021):

Same, I looked into this before not sure if it was an esp bug or hardware bug.

@tablatronix commented on GitHub (Feb 10, 2021): Same, I looked into this before not sure if it was an esp bug or hardware bug.

kerem commented

2026-02-28 01:28:13 +03:00

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@tablatronix commented on GitHub (Feb 10, 2021):

ok figured it out, let me see if i can work something ( i thought setcountry was able to set this )

@tablatronix commented on GitHub (Feb 10, 2021): ok figured it out, let me see if i can work something ( i thought setcountry was able to set this )

kerem commented

2026-02-28 01:28:13 +03:00

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@tablatronix commented on GitHub (Feb 10, 2021):

You have to use apcallback, needs to be set after starting ap

  wm.setAPCallback(configModeCallback);

//gets called when WiFiManager enters configuration mode
void configModeCallback (WiFiManager *myWiFiManager) {
  esp_wifi_set_bandwidth(WIFI_IF_AP, WIFI_BW_HT20);
}

@tablatronix commented on GitHub (Feb 10, 2021): You have to use apcallback, needs to be set after starting ap ```c++ wm.setAPCallback(configModeCallback); //gets called when WiFiManager enters configuration mode void configModeCallback (WiFiManager *myWiFiManager) { esp_wifi_set_bandwidth(WIFI_IF_AP, WIFI_BW_HT20); } ```

kerem commented

2026-02-28 01:28:13 +03:00

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@lbussy commented on GitHub (Feb 10, 2021):

Hah! You had a fix for it all along. :)

Thank you, sir.

@lbussy commented on GitHub (Feb 10, 2021): Hah! You had a fix for it all along. :) Thank you, sir.

kerem commented

2026-02-28 01:28:13 +03:00

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@tablatronix commented on GitHub (Feb 10, 2021):

I was playing with this a few weeks ago, and forgot all about it, I had to test again to see if it needed to be before or after, if you set it before, it doesn't work, unlike channels. Shrug

So it has to be set after you start ap, or something in our startap resets it

@tablatronix commented on GitHub (Feb 10, 2021): I was playing with this a few weeks ago, and forgot all about it, I had to test again to see if it needed to be before or after, if you set it before, it doesn't work, unlike channels. Shrug So it has to be set after you start ap, or something in our startap resets it

kerem commented

2026-02-28 01:28:13 +03:00

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@lbussy commented on GitHub (Feb 12, 2021):

You know this - but that ended up working. Thank you for your help.

@lbussy commented on GitHub (Feb 12, 2021): You know this - but that ended up working. Thank you for your help.