Proximity Kit - firmware keeps crashing

[danielebruneo]

We noticed that the firmware sometimes freeze after a few interactions.
On the last tests it kept freezing continuosly after initialization:

Firmware Version: 0x92 = v2.0
NFC ready. Scan PICC to see UID, SAK, type, and data blocks...
.
Soft WDT reset

>>>stack>>>

ctx: cont
sp: 3fff0a90 end: 3fff0cd0 offset: 01b0
3fff0c40:  0fffffff 40209e52 00000000 40209e3d  
3fff0c50:  00000000 3ffef614 3ffef340 40209995  
3fff0c60:  3fff142c 3fff147c 3ffef614 000000b3  
3fff0c70:  3fff219e feefef0a 40215a30 feefeffe  
3fff0c80:  00000000 00000100 feefeffe feefeffe  
3fff0c90:  00000000 40215084 00000001 feefeffe  
3fff0ca0:  feefeffe feefeffe feefeffe 3ffef744  
3fff0cb0:  3fffdad0 00000000 3ffef714 402106e8  
3fff0cc0:  feefeffe feefeffe 3ffe8604 40100c39  
<<<stack<<<
�⸮!�⸮L⸮<1⸮1⸮⸮mounting FS...
mounted file system
reading config file
opened config file
{"mqtt_server":"stations.muv2020.eu","mqtt_port":"1883","mqtt_username":"monitoringstation","mqtt_password":"jN4CW5Mt3cW","mqtt_topic":"sensor/%u/data","address":"insert address"}
parsed json, from setup
Using saved credentials
Wifi connected...
Firmware Version: 0x92 = v2.0
NFC ready. Scan PICC to see UID, SAK, type, and data blocks...
.
Soft WDT reset

>>>stack>>>

ctx: cont
sp: 3fff0a90 end: 3fff0cd0 offset: 01b0
3fff0c40:  0fffffff 40209e52 00000000 40209e3d  
3fff0c50:  00000000 3ffef614 3ffef340 40209995  
3fff0c60:  3fff142c 3fff147c 3ffef614 000000b3  
3fff0c70:  3fff219e feefef0a 40215a30 feefeffe  
3fff0c80:  00000000 00000100 feefeffe feefeffe  
3fff0c90:  00000000 40215084 00000001 feefeffe  
3fff0ca0:  feefeffe feefeffe feefeffe 3ffef744  
3fff0cb0:  3fffdad0 00000000 3ffef714 402106e8  
3fff0cc0:  feefeffe feefeffe 3ffe8604 40100c39  
<<<stack<<<
�⸮!�⸮L⸮<1⸮1⸮⸮mounting FS...
mounted file system
reading config file
opened config file
{"mqtt_server":"stations.muv2020.eu","mqtt_port":"1883","mqtt_username":"monitoringstation","mqtt_password":"jN4CW5Mt3cW","mqtt_topic":"sensor/%u/data","address":"insert address"}
parsed json, from setup
Using saved credentials
Wifi connected...
Firmware Version: 0x92 = v2.0
NFC ready. Scan PICC to see UID, SAK, type, and data blocks...
.
Soft WDT reset

>>>stack>>>

ctx: cont
sp: 3fff0a90 end: 3fff0cd0 offset: 01b0
3fff0c40:  0fffffff 40209e52 00000000 40209e3d  
3fff0c50:  00000000 3ffef614 3ffef340 40209995  
3fff0c60:  3fff142c 3fff147c 3ffef614 000000b3  
3fff0c70:  3fff219e feefef0a 40215a30 feefeffe  
3fff0c80:  00000000 00000100 feefeffe feefeffe  
3fff0c90:  00000000 40215084 00000001 feefeffe  
3fff0ca0:  feefeffe feefeffe feefeffe 3ffef744  
3fff0cb0:  3fffdad0 00000000 3ffef714 402106e8  
3fff0cc0:  feefeffe feefeffe 3ffe8604 40100c39  
<<<stack<<<
�⸮!�⸮L⸮<1⸮1⸮⸮mounting FS...
mounted file system
reading config file
opened config file
{"mqtt_server":"stations.muv2020.eu","mqtt_port":"1883","mqtt_username":"monitoringstation","mqtt_password":"jN4CW5Mt3cW","mqtt_topic":"sensor/%u/data","address":"insert address"}
parsed json, from setup
Using saved credentials
Wifi connected...
Firmware Version: 0x92 = v2.0
NFC ready. Scan PICC to see UID, SAK, type, and data blocks...
.
Soft WDT reset

>>>stack>>>

ctx: cont
sp: 3fff0a90 end: 3fff0cd0 offset: 01b0
3fff0c40:  0fffffff 40209e52 00000000 40209e3d  
3fff0c50:  00000000 3ffef614 3ffef340 40209995  
3fff0c60:  3fff142c 3fff147c 3ffef614 000000b3  
3fff0c70:  3fff219e feefef0a 40215a30 feefeffe  
3fff0c80:  00000000 00000100 feefeffe feefeffe  
3fff0c90:  00000000 40215084 00000001 feefeffe  
3fff0ca0:  feefeffe feefeffe feefeffe 3ffef744  
3fff0cb0:  3fffdad0 00000000 3ffef714 402106e8  
3fff0cc0:  feefeffe feefeffe 3ffe8604 40100c39  

Any idea why this could happen?

[emmapa]

I tried to reproduce the bug but without success.
did you get the same problem with all the esp8266 boards?

It could be the arduino IDE version (I'm using Arduino IDE 1.8.5) or esp8266 core (I'm using version 2.4.0). Could you check what you are using?