I put an issue about this out here about issues with MQTT on the ESP32 with AWS: https://github.com/cesanta/mongoose-os/issues/344
Some of my MQTT messages are coming back as published, but AWS is not getting them. I am using the latest Mongoose OS code. I am able to replicate the issue on multiple networks and devices pretty consistently. Anyone else having this issue or does anyone else have ideas about what could be going on? The percentage of messages that are having issues are ~5% and the QoS I am using is 1, at least once.