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blynk.cloud

Blynk C++ Library for Arduino
MQTT samples: Python, JS, Lua, C/C++, ESP-IDF, Zephyr, etc.
HTTP and MQTT Data Converters
Device HTTP API
Device MQTT API
Gateway MQTT API

Provides IoT device UX, credentials provisioning, OTA updates, network management along with secure connectivity to the Blynk.Cloud:

Edgent component for ESP-IDF
Edgent for PlatformIO
Edgent for Arduino
Edgent for Particle
Edgent firmware for MicroPython
ESP32 Edgent for Cellular+WiFi

Blynk.NCP provides Blynk.Edgent features along with advanced functionality in a form of a Network Co-Processor:

Blynk.NCP Low Level Driver (for any MCU)
Example for Zephyr
Example for Arduino
Supported in Blynk C++ Library