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CCS/CC3220SF-LAUNCHXL: AWS plugin: subscribe_publish_sample example connection failure

Part Number: CC3220SF-LAUNCHXL


Tool/software: Code Composer Studio

I tried to run mqtt example from AWS plugin (here I used SDK v. 4.10.00.07 and AWS IoT Plugin v. 4.10.01.01).

The AWS IoT Core configuration is the same as in https://www.ti.com/tool/TIDM-1020. I noticed that the first few runs seemed to work (I can see statistics of connections and mqtt messeges in the AWS IoT Core console), however after some 3 resets, FW stopped working, it seems to have a trouble connecting to the Sntp server to get the date. In call retval = SNTP_getTime(NULL, 0, &timeval, &ntpTimeStamp); I receive value -100. 

Those ~3 successful times can be only seen on a fresh LauchPad.

Best Regards,

Jerzy