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[GH-ISSUE #1535] Many times the list of available wifi is not displayed in "Configure WiFi" menu. #1310

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opened 2026-02-28 01:29:31 +03:00 by kerem · 16 comments
kerem commented 2026-02-28 01:29:31 +03:00
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Originally created by @DonatelloX on GitHub (Dec 21, 2022).
Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/1535

Hardware

ESP32 Dev Module

Software

Arduino IDE 2.0.3
Arduino core ESP32 2.0.5

Description

With the latest versions of the WiFiManager library (2.0.15-rc.1, 2.0.14-beta), it is only sometimes possible to view the list of available WiFis in the "Configure WiFi" menu. Many times the list of available wifi is not displayed. Tried on multiple devices.
It is not a signal strength problem because trying several times then all the nearby wifi are displayed.

Originally created by @DonatelloX on GitHub (Dec 21, 2022). Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/1535 #### Hardware ESP32 Dev Module #### Software Arduino IDE 2.0.3 Arduino core ESP32 2.0.5 ### Description With the latest versions of the WiFiManager library (2.0.15-rc.1, 2.0.14-beta), it is only sometimes possible to view the list of available WiFis in the "Configure WiFi" menu. Many times the list of available wifi is not displayed. Tried on multiple devices. It is not a signal strength problem because trying several times then all the nearby wifi are displayed.
kerem commented 2026-02-28 01:29:32 +03:00
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@tablatronix commented on GitHub (Dec 21, 2022):

hmm, let me see what might cause that. I know there was some esp bugs in 2.0.4 but nobody else brought this up.

Can you possibly obtain serial logs and bump up debugging?

<!-- gh-comment-id:1361327083 --> @tablatronix commented on GitHub (Dec 21, 2022): hmm, let me see what might cause that. I know there was some esp bugs in 2.0.4 but nobody else brought this up. Can you possibly obtain serial logs and bump up debugging?
kerem commented 2026-02-28 01:29:32 +03:00
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@DonatelloX commented on GitHub (Dec 21, 2022):

Sure, thanks for reply!

This is what happens by pressing the "Configure WiFi" button. SSID names of WiFi networks are not displayed:

15:22:55.816 -> *wm:Starting Web Portal 
15:23:25.027 -> *wm:[ERROR] scan waiting 
15:23:26.309 -> *wm:. 
15:23:26.434 -> *wm:. 
15:23:26.527 -> *wm:. 
15:23:26.621 -> *wm:. 
15:23:26.714 -> *wm:. 
15:23:26.809 -> *wm:. 
15:23:26.935 -> *wm:. 
15:23:27.028 -> *wm:. 
15:23:27.121 -> *wm:. 
15:23:27.214 -> *wm:. 
15:23:27.338 -> *wm:. 
15:23:27.430 -> *wm:. 
15:23:27.523 -> *wm:. 
15:23:27.601 -> *wm:. 
15:23:27.740 -> *wm:. 
15:23:27.834 -> *wm:. 
15:23:27.913 -> *wm:-2 networks found

With debug (core debug level) information below:

15:33:45.738 -> *wm:Starting Web Portal 
15:33:45.738 -> [  7842][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 2 - STA_START
15:33:47.440 -> [  9585][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 1 - SCAN_DONE
15:33:55.352 -> [ 17469][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 12 - AP_STACONNECTED
15:33:55.525 -> [ 17657][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 14 - AP_STAIPASSIGNED
15:33:55.802 -> [ 17932][W][WebServer.cpp:436] send(): content length is zero
15:33:58.261 -> [ 20410][W][WebServer.cpp:436] send(): content length is zero
15:33:58.432 -> [ 20557][E][WebServer.cpp:649] _handleRequest(): request handler not found
15:33:59.394 -> [ 21536][W][WebServer.cpp:436] send(): content length is zero
15:33:59.439 -> *wm:[ERROR] scan waiting 
15:34:03.113 -> *wm:. 
15:34:03.205 -> *wm:. 
15:34:03.299 -> *wm:. 
15:34:03.437 -> *wm:. 
15:34:03.530 -> *wm:. 
15:34:03.624 -> *wm:. 
15:34:03.717 -> *wm:. 
15:34:03.825 -> *wm:. 
15:34:03.918 -> *wm:. 
15:34:04.010 -> *wm:. 
15:34:04.102 -> *wm:. 
15:34:04.228 -> *wm:. 
15:34:04.321 -> *wm:-2 networks found
15:34:04.321 -> [ 26454][W][WebServer.cpp:436] send(): content length is zero
15:34:04.570 -> [ 26672][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 1 - SCAN_DONE
15:34:05.636 -> [ 27754][W][WebServer.cpp:436] send(): content length is zero
15:34:05.713 -> [ 27836][W][WebServer.cpp:436] send(): content length is zero

After several tries, it works (the WiFi name is displayed):

15:32:17.559 -> [ 17781][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 12 - AP_STACONNECTED
15:32:18.241 -> [ 18479][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 14 - AP_STAIPASSIGNED
15:32:18.518 -> [ 18725][W][WebServer.cpp:436] send(): content length is zero
15:32:20.926 -> [ 21147][W][WebServer.cpp:436] send(): content length is zero
15:32:21.182 -> [ 21436][E][WebServer.cpp:649] _handleRequest(): request handler not found
15:32:22.197 -> [ 22424][W][WebServer.cpp:436] send(): content length is zero
15:32:22.197 -> [ 22431][W][WebServer.cpp:436] send(): content length is zero
15:32:27.223 -> [ 27429][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 1 - SCAN_DONE
15:32:37.641 -> [ 37852][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 1 - SCAN_DONE
15:32:37.641 -> *wm:1 networks found
15:32:38.800 -> [ 39035][W][WebServer.cpp:436] send(): content length is zero
15:32:39.003 -> [ 39233][W][WebServer.cpp:436] send(): content length is zero
<!-- gh-comment-id:1361396757 --> @DonatelloX commented on GitHub (Dec 21, 2022): Sure, thanks for reply! This is what happens by pressing the "Configure WiFi" button. SSID names of WiFi networks are not displayed: ``` 15:22:55.816 -> *wm:Starting Web Portal 15:23:25.027 -> *wm:[ERROR] scan waiting 15:23:26.309 -> *wm:. 15:23:26.434 -> *wm:. 15:23:26.527 -> *wm:. 15:23:26.621 -> *wm:. 15:23:26.714 -> *wm:. 15:23:26.809 -> *wm:. 15:23:26.935 -> *wm:. 15:23:27.028 -> *wm:. 15:23:27.121 -> *wm:. 15:23:27.214 -> *wm:. 15:23:27.338 -> *wm:. 15:23:27.430 -> *wm:. 15:23:27.523 -> *wm:. 15:23:27.601 -> *wm:. 15:23:27.740 -> *wm:. 15:23:27.834 -> *wm:. 15:23:27.913 -> *wm:-2 networks found ``` With **debug** (core debug level) information below: ``` 15:33:45.738 -> *wm:Starting Web Portal 15:33:45.738 -> [ 7842][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 2 - STA_START 15:33:47.440 -> [ 9585][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 1 - SCAN_DONE 15:33:55.352 -> [ 17469][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 12 - AP_STACONNECTED 15:33:55.525 -> [ 17657][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 14 - AP_STAIPASSIGNED 15:33:55.802 -> [ 17932][W][WebServer.cpp:436] send(): content length is zero 15:33:58.261 -> [ 20410][W][WebServer.cpp:436] send(): content length is zero 15:33:58.432 -> [ 20557][E][WebServer.cpp:649] _handleRequest(): request handler not found 15:33:59.394 -> [ 21536][W][WebServer.cpp:436] send(): content length is zero 15:33:59.439 -> *wm:[ERROR] scan waiting 15:34:03.113 -> *wm:. 15:34:03.205 -> *wm:. 15:34:03.299 -> *wm:. 15:34:03.437 -> *wm:. 15:34:03.530 -> *wm:. 15:34:03.624 -> *wm:. 15:34:03.717 -> *wm:. 15:34:03.825 -> *wm:. 15:34:03.918 -> *wm:. 15:34:04.010 -> *wm:. 15:34:04.102 -> *wm:. 15:34:04.228 -> *wm:. 15:34:04.321 -> *wm:-2 networks found 15:34:04.321 -> [ 26454][W][WebServer.cpp:436] send(): content length is zero 15:34:04.570 -> [ 26672][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 1 - SCAN_DONE 15:34:05.636 -> [ 27754][W][WebServer.cpp:436] send(): content length is zero 15:34:05.713 -> [ 27836][W][WebServer.cpp:436] send(): content length is zero ``` After several tries, it works (the WiFi name is displayed): ``` 15:32:17.559 -> [ 17781][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 12 - AP_STACONNECTED 15:32:18.241 -> [ 18479][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 14 - AP_STAIPASSIGNED 15:32:18.518 -> [ 18725][W][WebServer.cpp:436] send(): content length is zero 15:32:20.926 -> [ 21147][W][WebServer.cpp:436] send(): content length is zero 15:32:21.182 -> [ 21436][E][WebServer.cpp:649] _handleRequest(): request handler not found 15:32:22.197 -> [ 22424][W][WebServer.cpp:436] send(): content length is zero 15:32:22.197 -> [ 22431][W][WebServer.cpp:436] send(): content length is zero 15:32:27.223 -> [ 27429][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 1 - SCAN_DONE 15:32:37.641 -> [ 37852][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 1 - SCAN_DONE 15:32:37.641 -> *wm:1 networks found 15:32:38.800 -> [ 39035][W][WebServer.cpp:436] send(): content length is zero 15:32:39.003 -> [ 39233][W][WebServer.cpp:436] send(): content length is zero ```
kerem commented 2026-02-28 01:29:32 +03:00
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@DonatelloX commented on GitHub (Dec 21, 2022):

With verbose (core debug level) message:
When it doesn't work:

16:02:56.238 -> [ 31635][V][WebServer.cpp:296] handleClient(): New client: client.localIP()=192.168.4.1
16:02:56.238 -> [ 31636][V][Parsing.cpp:122] _parseRequest(): method: GET url: /wifi search: 
16:02:56.238 -> [ 31639][V][Parsing.cpp:226] _parseRequest(): headerName: Host
16:02:56.238 -> [ 31644][V][Parsing.cpp:227] _parseRequest(): headerValue: 192.168.4.1
16:02:56.238 -> [ 31651][V][Parsing.cpp:226] _parseRequest(): headerName: Connection
16:02:56.238 -> [ 31657][V][Parsing.cpp:227] _parseRequest(): headerValue: keep-alive
16:02:56.238 -> [ 31663][V][Parsing.cpp:226] _parseRequest(): headerName: x-wap-profile
16:02:56.238 -> [ 31669][V][Parsing.cpp:227] _parseRequest(): headerValue: http://218.249.47.94/Xianghe/MTK_Phone_KK_UAprofile.xml
16:02:56.238 -> [ 31680][V][Parsing.cpp:226] _parseRequest(): headerName: Upgrade-Insecure-Requests
16:02:56.238 -> [ 31687][V][Parsing.cpp:227] _parseRequest(): headerValue: 1
16:02:56.238 -> [ 31693][V][Parsing.cpp:226] _parseRequest(): headerName: User-Agent
16:02:56.238 -> [ 31698][V][Parsing.cpp:227] _parseRequest(): headerValue: Mozilla/5.0 (Linux; Android 7.0; thor Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/51.0.2704.91 Mobile Safari/537.36
16:02:56.238 -> [ 31717][V][Parsing.cpp:226] _parseRequest(): headerName: Accept
16:02:56.238 -> [ 31722][V][Parsing.cpp:227] _parseRequest(): headerValue: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
16:02:56.238 -> [ 31734][V][Parsing.cpp:226] _parseRequest(): headerName: Referer
16:02:56.238 -> [ 31739][V][Parsing.cpp:227] _parseRequest(): headerValue: http://192.168.4.1/
16:02:56.238 -> [ 31747][V][Parsing.cpp:226] _parseRequest(): headerName: Accept-Encoding
16:02:56.238 -> [ 31753][V][Parsing.cpp:227] _parseRequest(): headerValue: gzip, deflate
16:02:56.238 -> [ 31760][V][Parsing.cpp:226] _parseRequest(): headerName: Accept-Language
16:02:56.238 -> [ 31766][V][Parsing.cpp:227] _parseRequest(): headerValue: it-IT,en-US;q=0.8
16:02:56.238 -> [ 31773][V][Parsing.cpp:226] _parseRequest(): headerName: X-Requested-With
16:02:56.238 -> [ 31779][V][Parsing.cpp:227] _parseRequest(): headerValue: com.android.captiveportallogin
16:02:56.238 -> [ 31787][V][Parsing.cpp:254] _parseArguments(): args: 
16:02:56.238 -> [ 31792][V][Parsing.cpp:237] _parseRequest(): Request: /wifi
16:02:56.238 -> [ 31797][V][Parsing.cpp:238] _parseRequest():  Arguments: 
16:02:56.238 -> *wm:[ERROR] scan waiting 
16:02:56.238 -> *wm:. 
16:02:56.347 -> *wm:. 
16:02:56.440 -> *wm:. 
16:02:56.533 -> *wm:. 
16:02:56.643 -> *wm:. 
16:02:56.736 -> *wm:. 
16:02:56.829 -> *wm:. 
16:02:56.921 -> *wm:. 
16:02:57.048 -> *wm:. 
16:02:57.141 -> *wm:. 
16:02:57.233 -> *wm:. 
16:02:57.327 -> *wm:. 
16:02:57.549 -> *wm:-2 networks found
16:02:57.549 -> [ 33021][V][WebServer.cpp:296] handleClient(): New client: client.localIP()=192.168.4.1
16:02:57.549 -> [ 33022][V][Parsing.cpp:122] _parseRequest(): method: GET url: /generate_204 search: 
16:02:57.549 -> [ 33026][V][Parsing.cpp:226] _parseRequest(): headerName: User-Agent
16:02:57.549 -> [ 33031][V][Parsing.cpp:227] _parseRequest(): headerValue: Dalvik/2.1.0 (Linux; U; Android 7.0; thor Build/NRD90M)
16:02:57.549 -> [ 33042][V][Parsing.cpp:226] _parseRequest(): headerName: Host
16:02:57.549 -> [ 33047][V][Parsing.cpp:227] _parseRequest(): headerValue: captive.apple.com
16:02:57.549 -> [ 33054][V][Parsing.cpp:226] _parseRequest(): headerName: Connection
16:02:57.549 -> [ 33060][V][Parsing.cpp:227] _parseRequest(): headerValue: Keep-Alive
16:02:57.549 -> [ 33066][V][Parsing.cpp:226] _parseRequest(): headerName: Accept-Encoding
16:02:57.549 -> [ 33072][V][Parsing.cpp:227] _parseRequest(): headerValue: gzip
16:02:57.549 -> [ 33078][V][Parsing.cpp:254] _parseArguments(): args: 
16:02:57.549 -> [ 33083][V][Parsing.cpp:237] _parseRequest(): Request: /generate_204
16:02:57.549 -> [ 33089][V][Parsing.cpp:238] _parseRequest():  Arguments: 
16:02:57.549 -> [ 33094][E][WebServer.cpp:649] _handleRequest(): request handler not found
16:02:57.549 -> [ 33101][W][WebServer.cpp:436] send(): content length is zero
16:02:57.549 -> [ 33109][V][WebServer.cpp:296] handleClient(): New client: client.localIP()=192.168.4.1
16:02:57.595 -> [ 33183][V][WiFiGeneric.cpp:381] _arduino_event_cb(): SCAN Done: ID: 129, Status: 0, Results: 1
16:02:57.627 -> [ 33184][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 1 - SCAN_DONE
16:03:02.526 -> [ 38116][V][WebServer.cpp:296] handleClient(): New client: client.localIP()=192.168.4.1
16:03:02.650 -> [ 38117][V][Parsing.cpp:122] _parseRequest(): method: GET url: /generate_204 search: 
16:03:02.650 -> [ 38121][V][Parsing.cpp:226] _parseRequest(): headerName: User-Agent
16:03:02.650 -> [ 38126][V][Parsing.cpp:227] _parseRequest(): headerValue: Dalvik/2.1.0 (Linux; U; Android 7.0; thor Build/NRD90M)
16:03:02.650 -> [ 38137][V][Parsing.cpp:226] _parseRequest(): headerName: Host
16:03:02.650 -> [ 38142][V][Parsing.cpp:227] _parseRequest(): headerValue: captive.apple.com
16:03:02.650 -> [ 38149][V][Parsing.cpp:226] _parseRequest(): headerName: Connection
16:03:02.650 -> [ 38155][V][Parsing.cpp:227] _parseRequest(): headerValue: Keep-Alive
16:03:02.650 -> [ 38161][V][Parsing.cpp:226] _parseRequest(): headerName: Accept-Encoding
16:03:02.650 -> [ 38168][V][Parsing.cpp:227] _parseRequest(): headerValue: gzip
16:03:02.650 -> [ 38173][V][Parsing.cpp:254] _parseArguments(): args: 
16:03:02.650 -> [ 38178][V][Parsing.cpp:237] _parseRequest(): Request: /generate_204
16:03:02.650 -> [ 38184][V][Parsing.cpp:238] _parseRequest():  Arguments: 
16:03:02.650 -> [ 38190][E][WebServer.cpp:649] _handleRequest(): request handler not found
16:03:02.650 -> [ 38196][W][WebServer.cpp:436] send(): content length is zero

When it works:

15:54:58.271 -> [186433][V][WiFiGeneric.cpp:381] _arduino_event_cb(): SCAN Done: ID: 132, Status: 0, Results: 1
15:54:58.271 -> [186433][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 1 - SCAN_DONE
15:54:58.503 -> [186713][V][WebServer.cpp:296] handleClient(): New client: client.localIP()=192.168.4.1
15:54:58.688 -> [186714][V][Parsing.cpp:122] _parseRequest(): method: GET url: /wifi search: 
15:54:58.688 -> [186717][V][Parsing.cpp:226] _parseRequest(): headerName: Host
15:54:58.688 -> [186723][V][Parsing.cpp:227] _parseRequest(): headerValue: 192.168.4.1
15:54:58.688 -> [186729][V][Parsing.cpp:226] _parseRequest(): headerName: Connection
15:54:58.688 -> [186735][V][Parsing.cpp:227] _parseRequest(): headerValue: keep-alive
15:54:58.688 -> [186741][V][Parsing.cpp:226] _parseRequest(): headerName: x-wap-profile
15:54:58.688 -> [186747][V][Parsing.cpp:227] _parseRequest(): headerValue: http://218.249.47.94/Xianghe/MTK_Phone_KK_UAprofile.xml
15:54:58.688 -> [186758][V][Parsing.cpp:226] _parseRequest(): headerName: Upgrade-Insecure-Requests
15:54:58.688 -> [186765][V][Parsing.cpp:227] _parseRequest(): headerValue: 1
15:54:58.688 -> [186771][V][Parsing.cpp:226] _parseRequest(): headerName: User-Agent
15:54:58.688 -> [186776][V][Parsing.cpp:227] _parseRequest(): headerValue: Mozilla/5.0 (Linux; Android 7.0; thor Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/51.0.2704.91 Mobile Safari/537.36
15:54:58.688 -> [186795][V][Parsing.cpp:226] _parseRequest(): headerName: Accept
15:54:58.688 -> [186800][V][Parsing.cpp:227] _parseRequest(): headerValue: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
15:54:58.688 -> [186812][V][Parsing.cpp:226] _parseRequest(): headerName: Referer
15:54:58.688 -> [186818][V][Parsing.cpp:227] _parseRequest(): headerValue: http://192.168.4.1/
15:54:58.688 -> [186825][V][Parsing.cpp:226] _parseRequest(): headerName: Accept-Encoding
15:54:58.688 -> [186831][V][Parsing.cpp:227] _parseRequest(): headerValue: gzip, deflate
15:54:58.688 -> [186838][V][Parsing.cpp:226] _parseRequest(): headerName: Accept-Language
15:54:58.688 -> [186844][V][Parsing.cpp:227] _parseRequest(): headerValue: it-IT,en-US;q=0.8
15:54:58.688 -> [186851][V][Parsing.cpp:226] _parseRequest(): headerName: X-Requested-With
15:54:58.688 -> [186857][V][Parsing.cpp:227] _parseRequest(): headerValue: com.android.captiveportallogin
15:54:58.688 -> [186865][V][Parsing.cpp:254] _parseArguments(): args: 
15:54:58.688 -> [186870][V][Parsing.cpp:237] _parseRequest(): Request: /wifi
15:54:58.688 -> [186876][V][Parsing.cpp:238] _parseRequest():  Arguments: 
15:55:05.056 -> [193114][V][WiFiGeneric.cpp:381] _arduino_event_cb(): SCAN Done: ID: 133, Status: 0, Results: 1
15:55:05.056 -> [193114][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 1 - SCAN_DONE
15:55:05.056 -> *wm:1 networks found
15:55:05.056 -> [193137][V][WebServer.cpp:296] handleClient(): New client: client.localIP()=192.168.4.1
15:55:05.056 -> [193138][V][Parsing.cpp:122] _parseRequest(): method: GET url: /generate_204 search: 
15:55:05.056 -> [193142][V][Parsing.cpp:226] _parseRequest(): headerName: User-Agent
15:55:05.056 -> [193148][V][Parsing.cpp:227] _parseRequest(): headerValue: Dalvik/2.1.0 (Linux; U; Android 7.0; thor Build/NRD90M)
15:55:05.056 -> [193158][V][Parsing.cpp:226] _parseRequest(): headerName: Host
15:55:05.056 -> [193163][V][Parsing.cpp:227] _parseRequest(): headerValue: captive.apple.com
15:55:05.056 -> [193170][V][Parsing.cpp:226] _parseRequest(): headerName: Connection
15:55:05.056 -> [193176][V][Parsing.cpp:227] _parseRequest(): headerValue: Keep-Alive
15:55:05.056 -> [193183][V][Parsing.cpp:226] _parseRequest(): headerName: Accept-Encoding
15:55:05.056 -> [193189][V][Parsing.cpp:227] _parseRequest(): headerValue: gzip
15:55:05.056 -> [193195][V][Parsing.cpp:254] _parseArguments(): args: 
15:55:05.056 -> [193200][V][Parsing.cpp:237] _parseRequest(): Request: /generate_204
15:55:05.056 -> [193206][V][Parsing.cpp:238] _parseRequest():  Arguments: 
15:55:05.056 -> [193211][E][WebServer.cpp:649] _handleRequest(): request handler not found
15:55:05.056 -> [193218][W][WebServer.cpp:436] send(): content length is zero
15:55:05.056 -> [193226][V][WebServer.cpp:296] handleClient(): New client: client.localIP()=192.168.4.1
15:55:10.145 -> [198233][V][WebServer.cpp:296] handleClient(): New client: client.localIP()=192.168.4.1
15:55:10.145 -> [198234][V][Parsing.cpp:122] _parseRequest(): method: GET url: /generate_204 search: 
15:55:10.145 -> [198238][V][Parsing.cpp:226] _parseRequest(): headerName: User-Agent
15:55:10.145 -> [198244][V][Parsing.cpp:227] _parseRequest(): headerValue: Dalvik/2.1.0 (Linux; U; Android 7.0; thor Build/NRD90M)
15:55:10.145 -> [198254][V][Parsing.cpp:226] _parseRequest(): headerName: Host
15:55:10.145 -> [198259][V][Parsing.cpp:227] _parseRequest(): headerValue: captive.apple.com
15:55:10.145 -> [198266][V][Parsing.cpp:226] _parseRequest(): headerName: Connection
15:55:10.145 -> [198272][V][Parsing.cpp:227] _parseRequest(): headerValue: Keep-Alive
15:55:10.145 -> [198278][V][Parsing.cpp:226] _parseRequest(): headerName: Accept-Encoding
15:55:10.145 -> [198285][V][Parsing.cpp:227] _parseRequest(): headerValue: gzip
15:55:10.145 -> [198290][V][Parsing.cpp:254] _parseArguments(): args: 
15:55:10.145 -> [198295][V][Parsing.cpp:237] _parseRequest(): Request: /generate_204
15:55:10.145 -> [198301][V][Parsing.cpp:238] _parseRequest():  Arguments: 
15:55:10.145 -> [198307][E][WebServer.cpp:649] _handleRequest(): request handler not found
15:55:10.145 -> [198314][W][WebServer.cpp:436] send(): content length is zero
<!-- gh-comment-id:1361453525 --> @DonatelloX commented on GitHub (Dec 21, 2022): With **verbose** (core debug level) message: When it doesn't work: ``` 16:02:56.238 -> [ 31635][V][WebServer.cpp:296] handleClient(): New client: client.localIP()=192.168.4.1 16:02:56.238 -> [ 31636][V][Parsing.cpp:122] _parseRequest(): method: GET url: /wifi search: 16:02:56.238 -> [ 31639][V][Parsing.cpp:226] _parseRequest(): headerName: Host 16:02:56.238 -> [ 31644][V][Parsing.cpp:227] _parseRequest(): headerValue: 192.168.4.1 16:02:56.238 -> [ 31651][V][Parsing.cpp:226] _parseRequest(): headerName: Connection 16:02:56.238 -> [ 31657][V][Parsing.cpp:227] _parseRequest(): headerValue: keep-alive 16:02:56.238 -> [ 31663][V][Parsing.cpp:226] _parseRequest(): headerName: x-wap-profile 16:02:56.238 -> [ 31669][V][Parsing.cpp:227] _parseRequest(): headerValue: http://218.249.47.94/Xianghe/MTK_Phone_KK_UAprofile.xml 16:02:56.238 -> [ 31680][V][Parsing.cpp:226] _parseRequest(): headerName: Upgrade-Insecure-Requests 16:02:56.238 -> [ 31687][V][Parsing.cpp:227] _parseRequest(): headerValue: 1 16:02:56.238 -> [ 31693][V][Parsing.cpp:226] _parseRequest(): headerName: User-Agent 16:02:56.238 -> [ 31698][V][Parsing.cpp:227] _parseRequest(): headerValue: Mozilla/5.0 (Linux; Android 7.0; thor Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/51.0.2704.91 Mobile Safari/537.36 16:02:56.238 -> [ 31717][V][Parsing.cpp:226] _parseRequest(): headerName: Accept 16:02:56.238 -> [ 31722][V][Parsing.cpp:227] _parseRequest(): headerValue: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 16:02:56.238 -> [ 31734][V][Parsing.cpp:226] _parseRequest(): headerName: Referer 16:02:56.238 -> [ 31739][V][Parsing.cpp:227] _parseRequest(): headerValue: http://192.168.4.1/ 16:02:56.238 -> [ 31747][V][Parsing.cpp:226] _parseRequest(): headerName: Accept-Encoding 16:02:56.238 -> [ 31753][V][Parsing.cpp:227] _parseRequest(): headerValue: gzip, deflate 16:02:56.238 -> [ 31760][V][Parsing.cpp:226] _parseRequest(): headerName: Accept-Language 16:02:56.238 -> [ 31766][V][Parsing.cpp:227] _parseRequest(): headerValue: it-IT,en-US;q=0.8 16:02:56.238 -> [ 31773][V][Parsing.cpp:226] _parseRequest(): headerName: X-Requested-With 16:02:56.238 -> [ 31779][V][Parsing.cpp:227] _parseRequest(): headerValue: com.android.captiveportallogin 16:02:56.238 -> [ 31787][V][Parsing.cpp:254] _parseArguments(): args: 16:02:56.238 -> [ 31792][V][Parsing.cpp:237] _parseRequest(): Request: /wifi 16:02:56.238 -> [ 31797][V][Parsing.cpp:238] _parseRequest(): Arguments: 16:02:56.238 -> *wm:[ERROR] scan waiting 16:02:56.238 -> *wm:. 16:02:56.347 -> *wm:. 16:02:56.440 -> *wm:. 16:02:56.533 -> *wm:. 16:02:56.643 -> *wm:. 16:02:56.736 -> *wm:. 16:02:56.829 -> *wm:. 16:02:56.921 -> *wm:. 16:02:57.048 -> *wm:. 16:02:57.141 -> *wm:. 16:02:57.233 -> *wm:. 16:02:57.327 -> *wm:. 16:02:57.549 -> *wm:-2 networks found 16:02:57.549 -> [ 33021][V][WebServer.cpp:296] handleClient(): New client: client.localIP()=192.168.4.1 16:02:57.549 -> [ 33022][V][Parsing.cpp:122] _parseRequest(): method: GET url: /generate_204 search: 16:02:57.549 -> [ 33026][V][Parsing.cpp:226] _parseRequest(): headerName: User-Agent 16:02:57.549 -> [ 33031][V][Parsing.cpp:227] _parseRequest(): headerValue: Dalvik/2.1.0 (Linux; U; Android 7.0; thor Build/NRD90M) 16:02:57.549 -> [ 33042][V][Parsing.cpp:226] _parseRequest(): headerName: Host 16:02:57.549 -> [ 33047][V][Parsing.cpp:227] _parseRequest(): headerValue: captive.apple.com 16:02:57.549 -> [ 33054][V][Parsing.cpp:226] _parseRequest(): headerName: Connection 16:02:57.549 -> [ 33060][V][Parsing.cpp:227] _parseRequest(): headerValue: Keep-Alive 16:02:57.549 -> [ 33066][V][Parsing.cpp:226] _parseRequest(): headerName: Accept-Encoding 16:02:57.549 -> [ 33072][V][Parsing.cpp:227] _parseRequest(): headerValue: gzip 16:02:57.549 -> [ 33078][V][Parsing.cpp:254] _parseArguments(): args: 16:02:57.549 -> [ 33083][V][Parsing.cpp:237] _parseRequest(): Request: /generate_204 16:02:57.549 -> [ 33089][V][Parsing.cpp:238] _parseRequest(): Arguments: 16:02:57.549 -> [ 33094][E][WebServer.cpp:649] _handleRequest(): request handler not found 16:02:57.549 -> [ 33101][W][WebServer.cpp:436] send(): content length is zero 16:02:57.549 -> [ 33109][V][WebServer.cpp:296] handleClient(): New client: client.localIP()=192.168.4.1 16:02:57.595 -> [ 33183][V][WiFiGeneric.cpp:381] _arduino_event_cb(): SCAN Done: ID: 129, Status: 0, Results: 1 16:02:57.627 -> [ 33184][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 1 - SCAN_DONE 16:03:02.526 -> [ 38116][V][WebServer.cpp:296] handleClient(): New client: client.localIP()=192.168.4.1 16:03:02.650 -> [ 38117][V][Parsing.cpp:122] _parseRequest(): method: GET url: /generate_204 search: 16:03:02.650 -> [ 38121][V][Parsing.cpp:226] _parseRequest(): headerName: User-Agent 16:03:02.650 -> [ 38126][V][Parsing.cpp:227] _parseRequest(): headerValue: Dalvik/2.1.0 (Linux; U; Android 7.0; thor Build/NRD90M) 16:03:02.650 -> [ 38137][V][Parsing.cpp:226] _parseRequest(): headerName: Host 16:03:02.650 -> [ 38142][V][Parsing.cpp:227] _parseRequest(): headerValue: captive.apple.com 16:03:02.650 -> [ 38149][V][Parsing.cpp:226] _parseRequest(): headerName: Connection 16:03:02.650 -> [ 38155][V][Parsing.cpp:227] _parseRequest(): headerValue: Keep-Alive 16:03:02.650 -> [ 38161][V][Parsing.cpp:226] _parseRequest(): headerName: Accept-Encoding 16:03:02.650 -> [ 38168][V][Parsing.cpp:227] _parseRequest(): headerValue: gzip 16:03:02.650 -> [ 38173][V][Parsing.cpp:254] _parseArguments(): args: 16:03:02.650 -> [ 38178][V][Parsing.cpp:237] _parseRequest(): Request: /generate_204 16:03:02.650 -> [ 38184][V][Parsing.cpp:238] _parseRequest(): Arguments: 16:03:02.650 -> [ 38190][E][WebServer.cpp:649] _handleRequest(): request handler not found 16:03:02.650 -> [ 38196][W][WebServer.cpp:436] send(): content length is zero ``` When it works: ``` 15:54:58.271 -> [186433][V][WiFiGeneric.cpp:381] _arduino_event_cb(): SCAN Done: ID: 132, Status: 0, Results: 1 15:54:58.271 -> [186433][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 1 - SCAN_DONE 15:54:58.503 -> [186713][V][WebServer.cpp:296] handleClient(): New client: client.localIP()=192.168.4.1 15:54:58.688 -> [186714][V][Parsing.cpp:122] _parseRequest(): method: GET url: /wifi search: 15:54:58.688 -> [186717][V][Parsing.cpp:226] _parseRequest(): headerName: Host 15:54:58.688 -> [186723][V][Parsing.cpp:227] _parseRequest(): headerValue: 192.168.4.1 15:54:58.688 -> [186729][V][Parsing.cpp:226] _parseRequest(): headerName: Connection 15:54:58.688 -> [186735][V][Parsing.cpp:227] _parseRequest(): headerValue: keep-alive 15:54:58.688 -> [186741][V][Parsing.cpp:226] _parseRequest(): headerName: x-wap-profile 15:54:58.688 -> [186747][V][Parsing.cpp:227] _parseRequest(): headerValue: http://218.249.47.94/Xianghe/MTK_Phone_KK_UAprofile.xml 15:54:58.688 -> [186758][V][Parsing.cpp:226] _parseRequest(): headerName: Upgrade-Insecure-Requests 15:54:58.688 -> [186765][V][Parsing.cpp:227] _parseRequest(): headerValue: 1 15:54:58.688 -> [186771][V][Parsing.cpp:226] _parseRequest(): headerName: User-Agent 15:54:58.688 -> [186776][V][Parsing.cpp:227] _parseRequest(): headerValue: Mozilla/5.0 (Linux; Android 7.0; thor Build/NRD90M; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/51.0.2704.91 Mobile Safari/537.36 15:54:58.688 -> [186795][V][Parsing.cpp:226] _parseRequest(): headerName: Accept 15:54:58.688 -> [186800][V][Parsing.cpp:227] _parseRequest(): headerValue: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 15:54:58.688 -> [186812][V][Parsing.cpp:226] _parseRequest(): headerName: Referer 15:54:58.688 -> [186818][V][Parsing.cpp:227] _parseRequest(): headerValue: http://192.168.4.1/ 15:54:58.688 -> [186825][V][Parsing.cpp:226] _parseRequest(): headerName: Accept-Encoding 15:54:58.688 -> [186831][V][Parsing.cpp:227] _parseRequest(): headerValue: gzip, deflate 15:54:58.688 -> [186838][V][Parsing.cpp:226] _parseRequest(): headerName: Accept-Language 15:54:58.688 -> [186844][V][Parsing.cpp:227] _parseRequest(): headerValue: it-IT,en-US;q=0.8 15:54:58.688 -> [186851][V][Parsing.cpp:226] _parseRequest(): headerName: X-Requested-With 15:54:58.688 -> [186857][V][Parsing.cpp:227] _parseRequest(): headerValue: com.android.captiveportallogin 15:54:58.688 -> [186865][V][Parsing.cpp:254] _parseArguments(): args: 15:54:58.688 -> [186870][V][Parsing.cpp:237] _parseRequest(): Request: /wifi 15:54:58.688 -> [186876][V][Parsing.cpp:238] _parseRequest(): Arguments: 15:55:05.056 -> [193114][V][WiFiGeneric.cpp:381] _arduino_event_cb(): SCAN Done: ID: 133, Status: 0, Results: 1 15:55:05.056 -> [193114][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 1 - SCAN_DONE 15:55:05.056 -> *wm:1 networks found 15:55:05.056 -> [193137][V][WebServer.cpp:296] handleClient(): New client: client.localIP()=192.168.4.1 15:55:05.056 -> [193138][V][Parsing.cpp:122] _parseRequest(): method: GET url: /generate_204 search: 15:55:05.056 -> [193142][V][Parsing.cpp:226] _parseRequest(): headerName: User-Agent 15:55:05.056 -> [193148][V][Parsing.cpp:227] _parseRequest(): headerValue: Dalvik/2.1.0 (Linux; U; Android 7.0; thor Build/NRD90M) 15:55:05.056 -> [193158][V][Parsing.cpp:226] _parseRequest(): headerName: Host 15:55:05.056 -> [193163][V][Parsing.cpp:227] _parseRequest(): headerValue: captive.apple.com 15:55:05.056 -> [193170][V][Parsing.cpp:226] _parseRequest(): headerName: Connection 15:55:05.056 -> [193176][V][Parsing.cpp:227] _parseRequest(): headerValue: Keep-Alive 15:55:05.056 -> [193183][V][Parsing.cpp:226] _parseRequest(): headerName: Accept-Encoding 15:55:05.056 -> [193189][V][Parsing.cpp:227] _parseRequest(): headerValue: gzip 15:55:05.056 -> [193195][V][Parsing.cpp:254] _parseArguments(): args: 15:55:05.056 -> [193200][V][Parsing.cpp:237] _parseRequest(): Request: /generate_204 15:55:05.056 -> [193206][V][Parsing.cpp:238] _parseRequest(): Arguments: 15:55:05.056 -> [193211][E][WebServer.cpp:649] _handleRequest(): request handler not found 15:55:05.056 -> [193218][W][WebServer.cpp:436] send(): content length is zero 15:55:05.056 -> [193226][V][WebServer.cpp:296] handleClient(): New client: client.localIP()=192.168.4.1 15:55:10.145 -> [198233][V][WebServer.cpp:296] handleClient(): New client: client.localIP()=192.168.4.1 15:55:10.145 -> [198234][V][Parsing.cpp:122] _parseRequest(): method: GET url: /generate_204 search: 15:55:10.145 -> [198238][V][Parsing.cpp:226] _parseRequest(): headerName: User-Agent 15:55:10.145 -> [198244][V][Parsing.cpp:227] _parseRequest(): headerValue: Dalvik/2.1.0 (Linux; U; Android 7.0; thor Build/NRD90M) 15:55:10.145 -> [198254][V][Parsing.cpp:226] _parseRequest(): headerName: Host 15:55:10.145 -> [198259][V][Parsing.cpp:227] _parseRequest(): headerValue: captive.apple.com 15:55:10.145 -> [198266][V][Parsing.cpp:226] _parseRequest(): headerName: Connection 15:55:10.145 -> [198272][V][Parsing.cpp:227] _parseRequest(): headerValue: Keep-Alive 15:55:10.145 -> [198278][V][Parsing.cpp:226] _parseRequest(): headerName: Accept-Encoding 15:55:10.145 -> [198285][V][Parsing.cpp:227] _parseRequest(): headerValue: gzip 15:55:10.145 -> [198290][V][Parsing.cpp:254] _parseArguments(): args: 15:55:10.145 -> [198295][V][Parsing.cpp:237] _parseRequest(): Request: /generate_204 15:55:10.145 -> [198301][V][Parsing.cpp:238] _parseRequest(): Arguments: 15:55:10.145 -> [198307][E][WebServer.cpp:649] _handleRequest(): request handler not found 15:55:10.145 -> [198314][W][WebServer.cpp:436] send(): content length is zero ```
kerem commented 2026-02-28 01:29:32 +03:00
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@tablatronix commented on GitHub (Dec 21, 2022):

Can you turn on ESP debugging ?
-2 networks ????
interesting

<!-- gh-comment-id:1362172658 --> @tablatronix commented on GitHub (Dec 21, 2022): Can you turn on ESP debugging ? -2 networks ???? interesting
kerem commented 2026-02-28 01:29:32 +03:00
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@DonatelloX commented on GitHub (Dec 22, 2022):

In my test, I used wifiManager.setDebugOutput(true);, but I don't understand how to increase the debug level.

<!-- gh-comment-id:1362725327 --> @DonatelloX commented on GitHub (Dec 22, 2022): In my test, I used `wifiManager.setDebugOutput(true);`, but I don't understand how to increase the debug level.
kerem commented 2026-02-28 01:29:32 +03:00
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@tablatronix commented on GitHub (Dec 22, 2022):

in arduino? its in the menu

<!-- gh-comment-id:1362920974 --> @tablatronix commented on GitHub (Dec 22, 2022): in arduino? its in the menu
kerem commented 2026-02-28 01:29:32 +03:00
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@DonatelloX commented on GitHub (Dec 22, 2022):

If you see the reports I posted above, I used DEBUG and VERBOSE ("core debug level" option in menu of the Arduino IDE).
I noticed that when library works (it has successfully searched for wifi networks) the message appears:
[ 37852][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 1 - SCAN_DONE
While this message is missing when scan fails.

<!-- gh-comment-id:1362927705 --> @DonatelloX commented on GitHub (Dec 22, 2022): If you see the reports I posted above, I used DEBUG and VERBOSE ("core debug level" option in menu of the Arduino IDE). I noticed that when library works (it has successfully searched for wifi networks) the message appears: `[ 37852][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 1 - SCAN_DONE` While this message is missing when scan fails.
kerem commented 2026-02-28 01:29:32 +03:00
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@tablatronix commented on GitHub (Dec 22, 2022):

you need wifi debug level, ah maybe there is just nothing useful then.
This looks like an esp library issue, is there anything special about your envirmoment, how many aps? Clean power supply? no other wifi close by

<!-- gh-comment-id:1362938318 --> @tablatronix commented on GitHub (Dec 22, 2022): you need wifi debug level, ah maybe there is just nothing useful then. This looks like an esp library issue, is there anything special about your envirmoment, how many aps? Clean power supply? no other wifi close by
kerem commented 2026-02-28 01:29:32 +03:00
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@DonatelloX commented on GitHub (Dec 22, 2022):

At the moment I have only 1 WiFi AP, there are no other APs nearby. But even if I move to an area with dozens of APs WiFi, many times they are not scanned, only sometimes there is a list of all available APs.
I powered the ESP32 with a stabilized power supply, if I try with an ESP32 development kit connected to the PC (therefore power supply from PC) I get the same results.

<!-- gh-comment-id:1362965123 --> @DonatelloX commented on GitHub (Dec 22, 2022): At the moment I have only 1 WiFi AP, there are no other APs nearby. But even if I move to an area with dozens of APs WiFi, many times they are not scanned, only sometimes there is a list of all available APs. I powered the ESP32 with a stabilized power supply, if I try with an ESP32 development kit connected to the PC (therefore power supply from PC) I get the same results.
kerem commented 2026-02-28 01:29:32 +03:00
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@tablatronix commented on GitHub (Dec 22, 2022):

And you are definitely on 2.0.5? I will see if I can try to reproduce or at least add some workaround.

Can you add a wifi mode() to the start of your sketch to make sure wifi is initializing early enough and see if that makes a diffeence?

<!-- gh-comment-id:1363093480 --> @tablatronix commented on GitHub (Dec 22, 2022): And you are definitely on 2.0.5? I will see if I can try to reproduce or at least add some workaround. Can you add a wifi mode() to the start of your sketch to make sure wifi is initializing early enough and see if that makes a diffeence?
kerem commented 2026-02-28 01:29:32 +03:00
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@tablatronix commented on GitHub (Dec 22, 2022):

It looks like when it fails scan wait is timing out because scan is taking forever, it seems to eventually finish, but its taking awhile..

16:02:57.627 -> [ 33184][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 1 - SCAN_DONE

<!-- gh-comment-id:1363097964 --> @tablatronix commented on GitHub (Dec 22, 2022): It looks like when it fails scan wait is timing out because scan is taking forever, it seems to eventually finish, but its taking awhile.. 16:02:57.627 -> [ 33184][D][WiFiGeneric.cpp:929] _eventCallback(): Arduino Event: 1 - SCAN_DONE
kerem commented 2026-02-28 01:29:32 +03:00
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@tablatronix commented on GitHub (Dec 22, 2022):

Are you using WM verbose? cause it should say

"WiFi Scan completed"), "in "+(
what does that say ?

<!-- gh-comment-id:1363101215 --> @tablatronix commented on GitHub (Dec 22, 2022): Are you using WM verbose? cause it should say "WiFi Scan completed"), "in "+( what does that say ?
kerem commented 2026-02-28 01:29:32 +03:00
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@DonatelloX commented on GitHub (Dec 27, 2022):

I used version 2.0.5 of the ESP32 Core Arduino and then version 2.0.6 but the problem remains.
Tried to use different wifi modes but the problem is not solved.

<!-- gh-comment-id:1365794267 --> @DonatelloX commented on GitHub (Dec 27, 2022): I used version 2.0.5 of the ESP32 Core Arduino and then version 2.0.6 but the problem remains. Tried to use different wifi modes but the problem is not solved.
kerem commented 2026-02-28 01:29:32 +03:00
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@DonatelloX commented on GitHub (Jan 16, 2023):

I tested with ESP32-S3 and I have the same problem: the list of WiFi networks is not always visible.

<!-- gh-comment-id:1383769916 --> @DonatelloX commented on GitHub (Jan 16, 2023): I tested with ESP32-S3 and I have the same problem: the list of WiFi networks is not always visible.
kerem commented 2026-02-28 01:29:32 +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
<!-- gh-comment-id:1696689608 --> @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 01:29:32 +03:00
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@tablatronix commented on GitHub (Sep 8, 2023):

There has not been any updates to this, I will have to check if it is still causing issues.

<!-- gh-comment-id:1710981952 --> @tablatronix commented on GitHub (Sep 8, 2023): There has not been any updates to this, I will have to check if it is still causing issues.
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