Exception 29 on iPhone

[Hassebas]

I am building a client-server app with the 'ESP8266 Thing Development Board'. The software stems from this example: Access Point (AP) Web Server.
In Safari it runs without problems on the iPhone. Even if the refresh rate of the page is set to 2 seconds (which i need for the final application)

However, if you add the webpage as an app to the homescreen and activate it, the app loses in a few minutes its connection with the server and the ESP8266 crashes. If the refresh rate is 15 sec or higher there is no problem.

This is the error code:

Exception (29):
epc1=0x4000e1c3 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000018 depc=0x00000000

ctx: sys
sp: 3ffffc80 end: 3fffffb0 offset: 01a0

stack>>>
3ffffe20: 40102ca1 3ffeff00 3fff0690 401043a6
3ffffe30: 402125c9 40212506 3fff38a4 40102e30
3ffffe40: 00000018 3fff0950 3fff08cc 00000000
3ffffe50: 40212664 3ff20a00 3fff38a4 3ffeda8e
3ffffe60: 3ffeda74 3ffecda8 3ffecda8 3ffeda74
3ffffe70: 3ffeda8e 0000002c 00000004 401004f4
3ffffe80: 3ffeda7e 3fff3c64 4020f3af 3ff20a00
3ffffe90: 3fff38a4 3fff60cc 00000015 4020f281
3ffffea0: 3ffecdb4 00000001 00000000 3fffdab0
3ffffeb0: 40000f83 00000030 0000000d ffffffff
3ffffec0: 40000f3d 00000023 00000000 3fffd9d0
3ffffed0: 00000000 00000000 00000000 fffffffe
3ffffee0: ffffffff 3fffc6fc 00000001 3fffdab0
3ffffef0: 00000000 3fffdad0 3fff1f08 00000030
3fffff00: 401067a0 00000000 00000013 401004d8
3fffff10: 4021681d ffffffb3 00000000 40107718
3fffff20: 4020eb19 3ffeda74 3ffeff00 3fff38a4
3fffff30: 00000000 3ffeda7e 3ffeda98 401067ba
3fffff40: 40209f6c 00000000 3ffeda7e 3ffeda74
3fffff50: 0000002e 00000000 3fff3c64 3ffeda68
3fffff60: 00000000 00000013 40209b9e 3ffeff00
3fffff70: 3ffeda68 3fffdcc0 3ffec5f8 3fff3b4c
3fffff80: 3ffeda84 00000040 00000000 3fff1f10
3fffff90: 402094e7 3fffdab0 00000000 4020744f
3fffffa0: 3ffec5f8 40000f49 3fffdab0 40000f49

Decoding 23 results
0x40102ca1: trc_NeedRTS at ?? line ?
0x401043a6: lmacProcessTxSuccess at ?? line ?
0x402125c9: ieee80211_alloc_proberesp at ?? line ?
0x40212506: ieee80211_alloc_proberesp at ?? line ?
0x40102e30: trc_NeedRTS at ?? line ?
0x40212664: ieee80211_send_proberesp at ?? line ?
0x401004f4: calloc at C:\Users\Harry\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266\umm_malloc/umm_malloc.c line 1684
0x4020f3af: hostap_input at ?? line ?
0x4020f281: hostap_input at ?? line ?
0x401067a0: igmp_timer at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/core/timers.c line 217
0x401004d8: malloc at C:\Users\Harry\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266\umm_malloc/umm_malloc.c line 1664
0x4021681d: cnx_node_search at ?? line ?
0x40107718: pvPortMalloc at C:\Users\Harry\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/heap.c line 13
0x4020eb19: hostap_input at ?? line ?
0x401067ba: igmp_timer at /Users/igrokhotkov/espressif/arduino/tools/sdk/lwip/src/core/timers.c line 222
0x40209f6c: DefFreqCalTimerCB at ?? line ?
0x40209b9e: pp_tx_idle_timeout at ?? line ?
0x402094e7: ppPeocessRxPktHdr at ?? line ?
0x4020744f: loop_task at C:\Users\Harry\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/core_esp8266_main.cpp line 56

Any idea how to fix this or have a work around?
.

[devyte]

@Hassebas please try:

• latest git
• PR Update to SDK 2.1.0 #3215 (SDK 2.1.0)
• PR lwip2: lighter implementation #3362 (lwip2)

I think I had a similar problem with 2.3.0 with the standard webserver, and had to migrate to the Async webserver for stability, but I've seen reports that the above fixes it (lwip2 mostly).

[devyte]

Closing due to no feedback in almost 2 months, and due to age.