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[GH-ISSUE #1523] Esp8266 wroom-02 overflow #1300

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opened 2026-02-28 01:29:29 +03:00 by kerem · 11 comments
kerem commented 2026-02-28 01:29:29 +03:00
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Originally created by @ehammock on GitHub (Nov 22, 2022).
Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/1523

PLEASE TRY Latest Master BRANCH before submitting bugs, in case they were already fixed.

Issues without basic info will be ignored or closed!

Please fill the info fields, it helps to get you faster support ;)

if you have a stack dump decode it:
https://github.com/esp8266/Arduino/blob/master/doc/Troubleshooting/stack_dump.rst

for better debug messages:
https://github.com/esp8266/Arduino/blob/master/doc/Troubleshooting/debugging.rst

----------------------------- Remove above -----------------------------

Basic Infos

Hardware

WiFimanager Branch/Release: Master

Esp8266/Esp32: ESP8266 WROOM-02

Hardware: ESP-12e, esp01, esp25

Core Version: 2.4.0, staging

Description

Problem description

Settings in IDE

Module: "WiFi Battery" marked wemos but unlikely

Additional libraries: WiFi manager only, basic example.

Sketch

Bundled wifimanager basic example.

#BEGIN
#include <Arduino.h>

void setup() {

}

void loop() {

}
#END

Debug Messages

messages here

The serial port overflows [updated for clarity] when the module is switched on. This works fine on a standard esp8266 but it seems to have overload issues with the wroom-02. I am flashing with a 2mb file size including a small file system.
Originally created by @ehammock on GitHub (Nov 22, 2022). Original GitHub issue: https://github.com/tzapu/WiFiManager/issues/1523 ## PLEASE TRY Latest Master BRANCH before submitting bugs, in case they were already fixed. ## Issues without basic info will be ignored or closed! Please fill the info fields, it helps to get you faster support ;) if you have a stack dump decode it: https://github.com/esp8266/Arduino/blob/master/doc/Troubleshooting/stack_dump.rst for better debug messages: https://github.com/esp8266/Arduino/blob/master/doc/Troubleshooting/debugging.rst ----------------------------- Remove above ----------------------------- ### Basic Infos #### Hardware WiFimanager Branch/Release: Master Esp8266/Esp32: ESP8266 WROOM-02 Hardware: ESP-12e, esp01, esp25 Core Version: 2.4.0, staging ### Description Problem description ### Settings in IDE Module: "WiFi Battery" marked wemos but unlikely Additional libraries: WiFi manager only, basic example. ### Sketch Bundled wifimanager basic example. ```cpp #BEGIN #include <Arduino.h> void setup() { } void loop() { } #END ``` ### Debug Messages ``` messages here The serial port overflows [updated for clarity] when the module is switched on. This works fine on a standard esp8266 but it seems to have overload issues with the wroom-02. I am flashing with a 2mb file size including a small file system. ```
kerem commented 2026-02-28 01:29:29 +03:00
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@tablatronix commented on GitHub (Nov 22, 2022):

what do you mean overloads?

<!-- gh-comment-id:1323823282 --> @tablatronix commented on GitHub (Nov 22, 2022): what do you mean overloads?
kerem commented 2026-02-28 01:29:29 +03:00
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@ehammock commented on GitHub (Nov 23, 2022):

Hi, many thanks for coming back to me. When I look at the serial monitor it continually scrolls with hex data. It doesn't do that with and Esp01 only the wroom-02.

<!-- gh-comment-id:1324920613 --> @ehammock commented on GitHub (Nov 23, 2022): Hi, many thanks for coming back to me. When I look at the serial monitor it continually scrolls with hex data. It doesn't do that with and Esp01 only the wroom-02.
kerem commented 2026-02-28 01:29:29 +03:00
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@tablatronix commented on GitHub (Nov 23, 2022):

what example are you using ?

<!-- gh-comment-id:1325121926 --> @tablatronix commented on GitHub (Nov 23, 2022): what example are you using ?
kerem commented 2026-02-28 01:29:29 +03:00
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@ehammock commented on GitHub (Nov 23, 2022):

Hi, the builtin BASIC example in arduino under library wifimanager.

<!-- gh-comment-id:1325740818 --> @ehammock commented on GitHub (Nov 23, 2022): Hi, the builtin BASIC example in arduino under library wifimanager.
kerem commented 2026-02-28 01:29:29 +03:00
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@tablatronix commented on GitHub (Nov 24, 2022):

Ill check but thats odd sounds like its crashing or a boot loop?

<!-- gh-comment-id:1325844972 --> @tablatronix commented on GitHub (Nov 24, 2022): Ill check but thats odd sounds like its crashing or a boot loop?
kerem commented 2026-02-28 01:29:29 +03:00
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@ehammock commented on GitHub (Nov 24, 2022):

Yes, it seems to be on boot.

I'll take another look this evening. My gut feel is that it is related to
the flash size which on the wroom-02 I think is smaller than the standard
esp8266. I would like to get it working though, as WiFi manager perfectly
suits my need, also the wroom-02 'WiFi battery' is a perfect physical
solution for my need.

Thanks.

On Thu, 24 Nov 2022, 01:47 Shawn A, @.***> wrote:

Ill check but thats odd sounds like its crashing or a boot loop?

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<!-- gh-comment-id:1326479452 --> @ehammock commented on GitHub (Nov 24, 2022): Yes, it seems to be on boot. I'll take another look this evening. My gut feel is that it is related to the flash size which on the wroom-02 I think is smaller than the standard esp8266. I would like to get it working though, as WiFi manager perfectly suits my need, also the wroom-02 'WiFi battery' is a perfect physical solution for my need. Thanks. On Thu, 24 Nov 2022, 01:47 Shawn A, ***@***.***> wrote: > Ill check but thats odd sounds like its crashing or a boot loop? > > — > Reply to this email directly, view it on GitHub > <https://github.com/tzapu/WiFiManager/issues/1523#issuecomment-1325844972>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/ASSJBFX2TZL6EFMLZ3IA2LTWJ3CK5ANCNFSM6AAAAAASHSAN7Y> > . > You are receiving this because you authored the thread.Message ID: > ***@***.***> >
kerem commented 2026-02-28 01:29:29 +03:00
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@tablatronix commented on GitHub (Nov 24, 2022):

What is a wroom 02?

<!-- gh-comment-id:1326645327 --> @tablatronix commented on GitHub (Nov 24, 2022): What is a wroom 02?
kerem commented 2026-02-28 01:29:29 +03:00
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@tablatronix commented on GitHub (Nov 24, 2022):

oh yeah these are pretty old, I think i have one

<!-- gh-comment-id:1326648536 --> @tablatronix commented on GitHub (Nov 24, 2022): oh yeah these are pretty old, I think i have one
kerem commented 2026-02-28 01:29:29 +03:00
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@ehammock commented on GitHub (Nov 25, 2022):

Many thanks.

I'm happy to contribute to your project (buy a coffee, patrion, fiverr etc)
if we can get this working.

Thanks, Edward.

On Thu, 24 Nov 2022, 16:18 Shawn A, @.***> wrote:

oh yeah these are pretty old, I think i have one

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https://github.com/tzapu/WiFiManager/issues/1523#issuecomment-1326648536,
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<!-- gh-comment-id:1327241203 --> @ehammock commented on GitHub (Nov 25, 2022): Many thanks. I'm happy to contribute to your project (buy a coffee, patrion, fiverr etc) if we can get this working. Thanks, Edward. On Thu, 24 Nov 2022, 16:18 Shawn A, ***@***.***> wrote: > oh yeah these are pretty old, I think i have one > > — > Reply to this email directly, view it on GitHub > <https://github.com/tzapu/WiFiManager/issues/1523#issuecomment-1326648536>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/ASSJBFSDI4T2TLNBW52W2NTWJ6ILXANCNFSM6AAAAAASHSAN7Y> > . > You are receiving this because you authored the thread.Message ID: > ***@***.***> >
kerem commented 2026-02-28 01:29:29 +03:00
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@tablatronix commented on GitHub (Nov 28, 2022):

Can you maybe add a delay on boot so you can see if there is a crashdump or something

<!-- gh-comment-id:1329802880 --> @tablatronix commented on GitHub (Nov 28, 2022): Can you maybe add a delay on boot so you can see if there is a crashdump or something
kerem commented 2026-02-28 01:29:29 +03:00
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@Andysoft2000 commented on GitHub (Dec 5, 2022):

Basic Infos
Hardware:
ESP8285 ((Lolin)D1 Mini Lite)

WiFimanager Branch/Release: Master

Esp8266/Esp32: ESP8285 / D1 Mini Lite

Hardware: ESP-12e, esp01, esp25

Core Version: 3.0.2
system_get_sdk_version(): 2.2.2-dev(38a443e)
system_get_boot_version(): 31
getFreeHeap(): 47344

Problem description
Settings in IDE

Additional libraries: WiFi manager only, OnDemandConfigPortai example..
Sketch
Bundled wifimanager example.

Serial out before crash:
*wm:[0] [ERROR] hostname: set failed!
*wm:[2] Connecting as wifi client...
*wm:[2] setSTAConfig static ip not set, skipping
*wm:[1] No wifi saved, skipping
*wm:[2] Connection result: WL_NO_SSID_AVAIL
*wm:[1] AutoConnect: FAILED
*wm:[2] Starting Config Portal
*wm:[2] AccessPoint set password is VALID
del if0
usl
mode : null
*wm:[2] Disabling STA
*wm:[2] Enabling AP
*wm:[1] StartAP with SSID: WM_AutoConnectAP
mode : softAP(c6:4f:33:d2:f5:b6)
add if1
dhcp server start:(ip:192.168.4.1,mask:255.255.255.0,gw:192.168.4.1)
bcn 100
bcn 0
del if1
usl
add if1
dhcp server start:(ip:192.168.4.1,mask:255.255.255.0,gw:192.168.4.1)
bcn 100
*wm:[1] AP IP address: 192.168.4.1
*wm:[2] [CB] _apcallback calling
[CALLBACK] configModeCallback fired
*wm:[1] Starting Web Portal
*wm:[2] [CB] _webservercallback calling
*wm:[2] HTTP server started
*wm:[2] WiFi Scan ASYNC started
mode : sta(c4:4f:33:d2:f5:b6) + softAP(c6:4f:33:d2:f5:b6)
add if0
*wm:[2] Config Portal Running, blocking, waiting for clients...
*wm:[2] Portal Timeout In 120 seconds
scandone
*wm:[2] WiFi Scan ASYNC completed in 2196 ms
*wm:[2] WiFi Scan ASYNC found: 12
add 1
aid 1
station: 76:f0:5b:71:e7:58 join, AID = 1
station: 76:f0:5b:71:e7:58 leave, AID = 1
rm 1
*wm:[2] Portal Timeout In 90 seconds
add 1
aid 1
station: 76:f0:5b:71:e7:58 join, AID = 1
*wm:[2] <- Request redirected to captive portal
*wm:[2] <- Request redirected to captive portal
*wm:[2] <- HTTP Root
*wm:[2] WiFi Scan ASYNC started
scandone
*wm:[2] WiFi Scan ASYNC completed in 2190 ms
*wm:[2] WiFi Scan ASYNC found: 13
*wm:[2] <- HTTP Root
*wm:[2] Scan is cached 7572 ms ago
*wm:[2] Portal Timeout In 118 seconds
*wm:[2] <- HTTP Root
*wm:[2] Scan is cached 14844 ms ago
*wm:[2] <- HTTP Wifi
*wm:[2] Scan is cached 18168 ms ago
*wm:[1] 13 networks found
*wm:[2] DUP AP: MainFrameGARTEN
*wm:[2] DUP AP: MainFrameGARTEN
*wm:[2] DUP AP: MainFrameGARTEN
*wm:[2] DUP AP: MainFrame
*wm:[2] DUP AP: MainFrame
*wm:[2] DUP AP: MainFrame
*wm:[2] DUP AP: LenasGastNetz
*wm:[2] DUP AP: LenasGastNetz
*wm:[2] DUP AP: LenasGastNetz
*wm:[2] AP: -37 MainFrameGARTEN
*wm:[2] AP: -38 MainFrame
*wm:[2] AP: -38 LenasGastNetz
*wm:[2] AP: -89 M22
*wm:[2] <- HTTP WiFi save
*wm:[2] processing save
*wm:[2] Connecting as wifi client...
*wm:[2] setSTAConfig static ip not set, skipping
*wm:[1] Connecting to NEW AP: MainFrame

Exeption Decoder:
0x401006cc: pvPortZalloc(size_t, char const*, int) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\umm_malloc/umm_heap_select.h line 85
0x40100dd0: umm_malloc_core(umm_heap_context_t*, size_t) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\umm_malloc/umm_local.c line 48
0x40100496: __wrap_spi_flash_read(uint32_t, uint32_t*, size_t) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\core_esp8266_phy.cpp line 309
0x4020b243: ESP8266WiFiSTAClass::begin(char const*, char const*, int, unsigned char const*, bool) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src\ESP8266WiFiSTA.cpp line 186
0x4020b193: ESP8266WiFiSTAClass::begin(char const*, char const*, int, unsigned char const*, bool) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src\ESP8266WiFiSTA.cpp line 154
0x40216ae8: optimistic_yield(uint32_t) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\core_esp8266_main.cpp line 153
0x40100ff0: umm_malloc(size_t) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\umm_malloc\umm_malloc.cpp line 821
0x40101035: umm_poison_calloc(size_t, size_t) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\umm_malloc/umm_poison.c line 185
0x40100430: ets_post(uint8, ETSSignal, ETSParam) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\core_esp8266_main.cpp line 181
0x40202e4d: WiFiManager::WiFi_Mode(WiFiMode, bool) at C:\Users\andys\Documents\Arduino\libraries\WiFiManager\WiFiManager.cpp line 3574
0x40204bdc: WiFiManager::wifiConnectNew(String, String, bool) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/WString.h line 277
0x40215964: String::operator=(String const&) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/WString.h line 277
0x40204fc2: WiFiManager::connectWifi(String, String, bool) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/WString.h line 79
0x402157e7: String::reserve(unsigned int) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\WString.cpp line 153
0x40215858: String::copy(char const*, unsigned int) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\WString.cpp line 225
0x40215964: String::operator=(String const&) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/WString.h line 277
0x4020a002: WiFiManager::processConfigPortal() at C:\Users\andys\Documents\Arduino\libraries\WiFiManager\WiFiManager.cpp line 889
0x40100430: ets_post(uint8, ETSSignal, ETSParam) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\core_esp8266_main.cpp line 181
0x4020a3c5: WiFiManager::startConfigPortal(char const*, char const*) at C:\Users\andys\Documents\Arduino\libraries\WiFiManager\WiFiManager.cpp line 806
0x40215858: String::copy(char const*, unsigned int) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\WString.cpp line 225
0x4020a5e2: WiFiManager::autoConnect(char const*, char const*) at C:\Users\andys\Documents\Arduino\libraries\WiFiManager\WiFiManager.cpp line 387
0x40201372: wifiInfo() at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/WString.h line 79
0x4020171a: setup() at C:\Users\andys\AppData\Local\Temp\arduino_modified_sketch_278754/OnDemandConfigPortal.ino line 290
0x40216b24: loop_wrapper() at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\core_esp8266_main.cpp line 198

If I use a D1 Mini (ESP8266 inside) everything works fine.
I hope this helps a little..

<!-- gh-comment-id:1338116482 --> @Andysoft2000 commented on GitHub (Dec 5, 2022): Basic Infos Hardware: ESP8285 ((Lolin)D1 Mini Lite) WiFimanager Branch/Release: Master Esp8266/Esp32: ESP8285 / D1 Mini Lite Hardware: ESP-12e, esp01, esp25 Core Version: 3.0.2 system_get_sdk_version(): 2.2.2-dev(38a443e) system_get_boot_version(): 31 getFreeHeap(): 47344 Problem description Settings in IDE Additional libraries: WiFi manager only, OnDemandConfigPortai example.. Sketch Bundled wifimanager example. Serial out before crash: *wm:[0] [ERROR] hostname: set failed! *wm:[2] Connecting as wifi client... *wm:[2] setSTAConfig static ip not set, skipping *wm:[1] No wifi saved, skipping *wm:[2] Connection result: WL_NO_SSID_AVAIL *wm:[1] AutoConnect: FAILED *wm:[2] Starting Config Portal *wm:[2] AccessPoint set password is VALID del if0 usl mode : null *wm:[2] Disabling STA *wm:[2] Enabling AP *wm:[1] StartAP with SSID: WM_AutoConnectAP mode : softAP(c6:4f:33:d2:f5:b6) add if1 dhcp server start:(ip:192.168.4.1,mask:255.255.255.0,gw:192.168.4.1) bcn 100 bcn 0 del if1 usl add if1 dhcp server start:(ip:192.168.4.1,mask:255.255.255.0,gw:192.168.4.1) bcn 100 *wm:[1] AP IP address: 192.168.4.1 *wm:[2] [CB] _apcallback calling [CALLBACK] configModeCallback fired *wm:[1] Starting Web Portal *wm:[2] [CB] _webservercallback calling *wm:[2] HTTP server started *wm:[2] WiFi Scan ASYNC started mode : sta(c4:4f:33:d2:f5:b6) + softAP(c6:4f:33:d2:f5:b6) add if0 *wm:[2] Config Portal Running, blocking, waiting for clients... *wm:[2] Portal Timeout In 120 seconds scandone *wm:[2] WiFi Scan ASYNC completed in 2196 ms *wm:[2] WiFi Scan ASYNC found: 12 add 1 aid 1 station: 76:f0:5b:71:e7:58 join, AID = 1 station: 76:f0:5b:71:e7:58 leave, AID = 1 rm 1 *wm:[2] Portal Timeout In 90 seconds add 1 aid 1 station: 76:f0:5b:71:e7:58 join, AID = 1 *wm:[2] <- Request redirected to captive portal *wm:[2] <- Request redirected to captive portal *wm:[2] <- HTTP Root *wm:[2] WiFi Scan ASYNC started scandone *wm:[2] WiFi Scan ASYNC completed in 2190 ms *wm:[2] WiFi Scan ASYNC found: 13 *wm:[2] <- HTTP Root *wm:[2] Scan is cached 7572 ms ago *wm:[2] Portal Timeout In 118 seconds *wm:[2] <- HTTP Root *wm:[2] Scan is cached 14844 ms ago *wm:[2] <- HTTP Wifi *wm:[2] Scan is cached 18168 ms ago *wm:[1] 13 networks found *wm:[2] DUP AP: MainFrameGARTEN *wm:[2] DUP AP: MainFrameGARTEN *wm:[2] DUP AP: MainFrameGARTEN *wm:[2] DUP AP: MainFrame *wm:[2] DUP AP: MainFrame *wm:[2] DUP AP: MainFrame *wm:[2] DUP AP: LenasGastNetz *wm:[2] DUP AP: LenasGastNetz *wm:[2] DUP AP: LenasGastNetz *wm:[2] AP: -37 MainFrameGARTEN *wm:[2] AP: -38 MainFrame *wm:[2] AP: -38 LenasGastNetz *wm:[2] AP: -89 M22 *wm:[2] <- HTTP WiFi save *wm:[2] processing save *wm:[2] Connecting as wifi client... *wm:[2] setSTAConfig static ip not set, skipping *wm:[1] Connecting to NEW AP: MainFrame Exeption Decoder: 0x401006cc: pvPortZalloc(size_t, char const*, int) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\umm_malloc/umm_heap_select.h line 85 0x40100dd0: umm_malloc_core(umm_heap_context_t*, size_t) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\umm_malloc/umm_local.c line 48 0x40100496: __wrap_spi_flash_read(uint32_t, uint32_t*, size_t) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\core_esp8266_phy.cpp line 309 0x4020b243: ESP8266WiFiSTAClass::begin(char const*, char const*, int, unsigned char const*, bool) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src\ESP8266WiFiSTA.cpp line 186 0x4020b193: ESP8266WiFiSTAClass::begin(char const*, char const*, int, unsigned char const*, bool) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\libraries\ESP8266WiFi\src\ESP8266WiFiSTA.cpp line 154 0x40216ae8: optimistic_yield(uint32_t) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\core_esp8266_main.cpp line 153 0x40100ff0: umm_malloc(size_t) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\umm_malloc\umm_malloc.cpp line 821 0x40101035: umm_poison_calloc(size_t, size_t) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\umm_malloc/umm_poison.c line 185 0x40100430: ets_post(uint8, ETSSignal, ETSParam) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\core_esp8266_main.cpp line 181 0x40202e4d: WiFiManager::WiFi_Mode(WiFiMode, bool) at C:\Users\andys\Documents\Arduino\libraries\WiFiManager\WiFiManager.cpp line 3574 0x40204bdc: WiFiManager::wifiConnectNew(String, String, bool) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/WString.h line 277 0x40215964: String::operator=(String const&) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/WString.h line 277 0x40204fc2: WiFiManager::connectWifi(String, String, bool) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/WString.h line 79 0x402157e7: String::reserve(unsigned int) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\WString.cpp line 153 0x40215858: String::copy(char const*, unsigned int) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\WString.cpp line 225 0x40215964: String::operator=(String const&) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/WString.h line 277 0x4020a002: WiFiManager::processConfigPortal() at C:\Users\andys\Documents\Arduino\libraries\WiFiManager\WiFiManager.cpp line 889 0x40100430: ets_post(uint8, ETSSignal, ETSParam) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\core_esp8266_main.cpp line 181 0x4020a3c5: WiFiManager::startConfigPortal(char const*, char const*) at C:\Users\andys\Documents\Arduino\libraries\WiFiManager\WiFiManager.cpp line 806 0x40215858: String::copy(char const*, unsigned int) at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\WString.cpp line 225 0x4020a5e2: WiFiManager::autoConnect(char const*, char const*) at C:\Users\andys\Documents\Arduino\libraries\WiFiManager\WiFiManager.cpp line 387 0x40201372: wifiInfo() at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266/WString.h line 79 0x4020171a: setup() at C:\Users\andys\AppData\Local\Temp\arduino_modified_sketch_278754/OnDemandConfigPortal.ino line 290 0x40216b24: loop_wrapper() at C:\Users\andys\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.2\cores\esp8266\core_esp8266_main.cpp line 198 If I use a D1 Mini (ESP8266 inside) everything works fine. I hope this helps a little..
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