Good day,
I have experience in IoT, Web and Cloud systems like as Wine Chiller (Raspberry Pi Zero W) with IBM Watson and Node-RED integration, electrocardiograph (ESP32) with AWS integration, weather station (ESP866) with own API integration and many others.
About your project - I have experience in ESP8266 and ESP32 programming with AWS Integration over secure connection (TLS) and OTA functions (over TLS too). I have used AWS IoT Core for MQTT messages triggering, Lambda functions for saving data from devices in Database (MySQL or DynamoDB), ElasticBeansTalks and for dashboard (NodeJS), EC2 for virtual machine, RDS for Mysql and Dynamo. I can share results of my work via private chat.
I would like to discuss about the project in details with you.
With best regards,
Ivan Medvedev.