ESP32 firmware sample project for OTA update using ThingsBoard and for sending telemetry to ThingsBoard.
See all details in ESP32 OTA using ThingsBoard tutorial.

ThingsBoard is an open-source server-side platform that allows you to monitor and control IoT devices. It is free for both personal and commercial usage and you can deploy it anywhere. If this is your first experience with the platform we recommend to review what-is-thingsboard page and getting-started guide.

ESP32 is a series of low-cost, low-power SOC microcontrollers with integrated self-contained Wi-Fi and dual-mode Bluetooth. This sample application allow you to deliver a new firmware images to EPS32 with using ThingsBoard and OTA.