Around the end of last year, Amazon announced MQTT v5.0 support for its AWS IoT Core MQTT Broker. Support for this protocol was added to the AWS wolfMQTT client example with a recent effort here at wolfSSL.
The wolfMQTT library is a client implementation of MQTT written in C for embedded use, with support for SSL/TLS via the wolfSSL library. wolfMQTT supports both the MQTT 3.1.1 specification as well as the MQTT v5.0 specification. And with the recent updates, the AWS client can now be used to test out AWS IoT Core’s new protocol support and its functionality. Note that we updated our AWS host instance to use an ATS endpoint, as they are the only ones that support MQTT v5.0 as of now.
For more information about wolfMQTT or its MQTT v5.0 support, If you have any questions or run into any issues, contact us at facts@wolfssl.com, or call us at +1 425 245 8247.
Reference
wolfMQTT GitHub Repository
wolfMQTT User Manual
AWS MQTT v5.0 Upgrade
AWS IoT Core ATS
MQTT v5.0 specification
HiveMQ: “MQTT 5: Upgrade now. Here’s why.”