Here is a pcap of the wolfMQTT example awsiot running from linux. From your log, it seems there is a problem with the cipher change after the handshake. Can you please share the wolfSSL settings from configuration.h?
Please post questions or comments you have about wolfSSL products here. It is helpful to be as descriptive as possible when asking your questions.
ReferencesStable Releases - download stable product releases.
Development Branch - latest development branch on GitHub.
wolfSSL Manual - wolfSSL (formerly CyaSSL) product manual and API reference.