Stuck while connecting to MQTT

[nimish21]

Connecting to wifi...
WiFi connected
IP address:
192.168.1.106
Attempting MQTT connection...
Exception (9):
epc1=0x40204d5d epc2=0x00000000 epc3=0x00000000 excvaddr=0x3430307a depc=0x00000000

ctx: cont
sp: 3ffffd00 end: 3fffffd0 offset: 01a0

stack>>>
3ffffea0: 3fff0b54 00000898 3fff0afc 40204774
3ffffeb0: 3fff1054 3fff0eac 00000014 40205914
3ffffec0: 00003a98 3ffffef0 3ffef3e0 402047c0
3ffffed0: 00000000 00000000 3fff0b54 00000000
3ffffee0: 000022b3 3ffe8c48 3ffef3c8 402049cf
3ffffef0: 00000000 00000000 3ffe8c48 00000000
3fffff00: 000001d1 3ffef3c8 3ffe8c48 40204a75
3fffff10: 40206310 90cbac34 40206310 00000000
3fffff20: 3ffe8c10 3ffef30c 3ffef310 40204e9c
3fffff30: 514d0400 3f045454 3ffef44c 3ffef50c
3fffff40: 3ffe8b7c 3ffe8c3c 00000000 40205324
3fffff50: 3fffdad0 3ffef3f0 3ffef44c 3ffef50c
3fffff60: 3fffdad0 3ffef30c 3ffef44c 40204f34
3fffff70: 00000000 00000000 3ffef44c 40205508
3fffff80: 40206310 3ffef30c 3ffef44c 402026d4
3fffff90: feefeffe 00000000 3ffef30c 4020277f
3fffffa0: 4020258c feefeffe 40205cfc 40205ce4
3fffffb0: feefeffe feefeffe 3ffef504 40205ac0
3fffffc0: feefeffe feefeffe 3ffe85ac 40100739
<<<stack<<<

ets Jan 8 2013,rst cause:2, boot mode:(3,6)

load 0x4010f000, len 1384, room 16
tail 8
chksum 0x2d
csum 0x2d
vbb28d4a3
~ld

[HamzaHajeir]

Add those lines just above setup()

const char trustRoot[] PROGMEM = R"EOF(
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
)EOF";
X509List cert(trustRoot);

and these lines after connecting to WiFi :

    configTime(3 * 3600, 0, "pool.ntp.org", "time.nist.gov");
    espClient.setCACert((const uint8_t*)trustRoot,1262);

I guess you could need to extract a different CACert .. For now just try this.