ESP8266 crashes when trying to connect to ADAFRUIT IO

[tomboc73]

Hi, I am new to this forum so please forgive me if I say silly things.


I am programming a NodeMCU (ESP8266) via Arduino IDE, and all goes fine ... I can see sensor readings on the serial monitor.
BUT: as soon as I try and connect to IO.ADAFRUIT using the lib AdaFruit_MQTT, I get a crash like

dafruit IO Example


Connecting to Wifi-XXXXX
.....
WiFi connected
IP address:
192.168.178.126
Connecting to Adafruit IO...

----= all fine up to here =----


Exception (3):
epc1=0x4000bee5 epc2=0x00000000 epc3=0x00000000 excvaddr=0x40230553 depc=0x00000000

ctx: cont
sp: 3ffef3c0 end: 3ffef600 offset: 01a0

>>>stack>>>
3ffef560: 32333539 00000001 3ffe8675 40203e4c
3ffef570: 40105792 3ffee3b8 3ffee3b8 40202c22
3ffef580: 4023046d 0000000f 3ffee5a8 402033ed
3ffef590: 3ffe8674 00000006 40230432 3ffee5d4
3ffef5a0: 4023046d 3ffee3b8 3ffee5a8 40201d1c
3ffef5b0: 7eb2a8c0 00ffffff 01b2a8c0 3ffee5d4
3ffef5c0: 4023046d 3ffee4b8 3ffee5a8 40201e06
3ffef5d0: 3ffe8670 7eb2a8c0 feefeffe feefeffe
3ffef5e0: 3fffdad0 00000000 3ffee5cc 4020393c
3ffef5f0: feefeffe feefeffe 3ffee5e0 40100718
<<<stack<<<


any idea on what could be wrong? I searched around but found nothing relevant ...

thanks a lot

tom