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[GH-ISSUE #1649] WiFi Scan ASYNC not always works #1403

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opened 2026-02-28 01:29:56 +03:00 by kerem · 5 comments

kerem commented

2026-02-28 01:29:56 +03:00

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Originally created by @Dario-Ciceri on GitHub (Aug 28, 2023).
Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/1649

On esp32: WiFi Scan ASYNC started and then nothing... sometimes it works after 6 seconds or 5... sometimes it doesn't at all....

Originally created by @Dario-Ciceri on GitHub (Aug 28, 2023). Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/1649 On esp32: `WiFi Scan ASYNC started` and then nothing... sometimes it works after 6 seconds or 5... sometimes it doesn't at all....

kerem

2026-02-28 01:29:56 +03:00

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kerem commented

2026-02-28 01:29:56 +03:00

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@Dario-Ciceri commented on GitHub (Aug 28, 2023):

I searched for WiFi.scanNetworks and found this one: res = WiFi.scanNetworks(true); which is weird ... (?)

Why using true?
These are the possible overrides:

```
bool          WiFi_scanNetworks(); 
```

bool          WiFi_scanNetworks(bool force, bool async);

bool          WiFi_scanNetworks(unsigned int cachetime, bool async);

bool          WiFi_scanNetworks(unsigned int cachetime);

Is it intentional to use WiFi_scanNetworks(unsigned int cachetime); with cachetime = true = 1 ????

@Dario-Ciceri commented on GitHub (Aug 28, 2023): I searched for `WiFi.scanNetworks` and found this one: `res = WiFi.scanNetworks(true);` which is weird ... (?) Why using `true`? These are the possible overrides: 1. bool WiFi_scanNetworks(); 2. bool WiFi_scanNetworks(bool force, bool async); 3. bool WiFi_scanNetworks(unsigned int cachetime, bool async); 4. bool WiFi_scanNetworks(unsigned int cachetime); Is it intentional to use `WiFi_scanNetworks(unsigned int cachetime);` with `cachetime = true = 1` ????

kerem commented

2026-02-28 01:29:56 +03:00

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@georgevbsantiago commented on GitHub (Aug 29, 2023):

I have the same problem.
I also identified that the ESP32 (devkit with Platformio) is taking time to map the Routers signal. And it doesn't always work. Sometimes I have to click the Refresh button for it to work.

platform = espressif32@6.3.2
board = esp32doit-devkit-v1
framework = arduino
lib_deps =
	WiFiManager@2.0.16-rc.2

@georgevbsantiago commented on GitHub (Aug 29, 2023): I have the same problem. I also identified that the ESP32 (devkit with Platformio) is taking time to map the Routers signal. And it doesn't always work. Sometimes I have to click the Refresh button for it to work. ``` platform = espressif32@6.3.2 board = esp32doit-devkit-v1 framework = arduino lib_deps = WiFiManager@2.0.16-rc.2 ```

kerem commented

2026-02-28 01:29:56 +03:00

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@tablatronix commented on GitHub (Aug 31, 2023):

ESP WiFi.scanNetworks(true);
WM WiFi_scanNetworks(true);

are 2 different things, not overrides

@tablatronix commented on GitHub (Aug 31, 2023): ESP WiFi.scanNetworks(true); WM WiFi_scanNetworks(true); are 2 different things, not overrides

kerem commented

2026-02-28 01:29:56 +03:00

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@Dario-Ciceri commented on GitHub (Aug 31, 2023):

ESP WiFi.scanNetworks(true); WM WiFi_scanNetworks(true);

are 2 different things, not overrides

uhm ok, I checked these days and tried to understand, I changed to match async call and it works

@Dario-Ciceri commented on GitHub (Aug 31, 2023): > ESP WiFi.scanNetworks(true); WM WiFi_scanNetworks(true); > > are 2 different things, not overrides uhm ok, I checked these days and tried to understand, I changed to match async call and it works

kerem commented

2026-02-28 01:29:56 +03:00

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@tablatronix commented on GitHub (Sep 16, 2023):

I am not sure this is the async scanning that is the issue, I am seeing 0 scans also sometimes.

you can go into the .h and change this to false to disable it

boolean       _asyncScan              = true; // perform wifi network scan async

@tablatronix commented on GitHub (Sep 16, 2023): I am not sure this is the async scanning that is the issue, I am seeing 0 scans also sometimes. you can go into the .h and change this to false to disable it boolean _asyncScan = true; // perform wifi network scan async