Hi All,

I am working on Renesas RZA2M embedded board with Linux. It has limited memory of 6MB flash(R-Only)
I am using mbedtls version 2.16.5 for aws iot sdk for embedded c according to
https://docs.aws.amazon.com/iot/latest/developerguide/iot-embedded-c-sdk.html

When I run sample application, it is taking 15 secs for "Seeding random generator number..." and throwing below error

$ ./subscribe_publish_sample

AWS IoT SDK Version 3.0.1-

DEBUG: main L#159 rootCA /root/../certs/AmazonRootCA1.pem
DEBUG: main L#160 clientCRT /root/../certs/774a17950a-certificate.pem.crt
DEBUG: main L#161 clientKey /root/../certs/774a17950a-private.pem.key
Connecting...
DEBUG: iot_tls_connect L#130
. Seeding the random number generator...
DEBUG: iot_tls_connect L#138 . Loading the CA root certificate ...
DEBUG: iot_tls_connect L#144 ok (0 skipped)

DEBUG: iot_tls_connect L#146 . Loading the client cert. and key...
DEBUG: iot_tls_connect L#159 ok

DEBUG: iot_tls_connect L#161 . Connecting to a2g7twmqo7hg82-ats.iot.ap-south-1.amazonaws.com/443...
DEBUG: iot_tls_connect L#180 ok

DEBUG: iot_tls_connect L#182 . Setting up the SSL/TLS structure...
DEBUG: iot_tls_connect L#223

SSL state connect : 0
DEBUG: iot_tls_connect L#226 ok

DEBUG: iot_tls_connect L#228

SSL state connect : 0
DEBUG: iot_tls_connect L#229 . Performing the SSL/TLS handshake...
ERROR: iot_tls_connect L#232 failed
! mbedtls_ssl_handshake returned -0x50

ERROR: main L#190 Error(-4) connecting to a2g7twmqo7hg82-ats.iot.ap-south-1.amazonaws.com:443

For detailed debug log using ssl_client2, go through https://pastebin.com/mNXhB0xj
https://pastebin.com/mNXhB0xj

my client device specifications
$ cat /proc/cpuinfo
processor : 0
model name : ARMv7 Processor rev 1 (v7l)
BogoMIPS : 1056.00
Features : half thumb fastmult vfp edsp neon vfpv3 tls vfpd32
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x4
CPU part : 0xc09
CPU revision : 1

Hardware : Generic R7S9210 (Flattened Device Tree)
Revision : 0000
Serial : 0000000000000000
$ free
total used free shared buffers cached
Mem: 7544 4484 3060 40 0 304
-/+ buffers/cache: 4180 3364
Swap: 0 0 0

I am not getting any help to resolve this issue and spending days and days. I am suspecting the issue might be timing related (or) cpu clock related (or) memory footprint related (or) something else

I need this forum help badly to resolve the issue. Please ping me if you need any other data.

Thanks in advance,
Srinivas.