Show HN: Show HN: I built a fail-closed watchdog for ESP32/Arduino in C++

Summary

Qrystal Uplink SDKs Official SDKs for Qrystal Uplink — a device monitoring service for IoT devices. Overview Qrystal Uplink allows you to monitor the health and connectivity of your IoT devices in real-time. These SDKs provide a simple way to send heartbeat signals from your ESP32 devices to the Qrystal Uplink service. Features Lightweight heartbeat API Automatic SSL/TLS encryption Connection pooling for efficient resource usage Automatic time synchronization via NTP Comprehensive error handling Available SDKs Platform Framework Language Documentation ESP32 Arduino C++ arduino/esp32/ ESP32 ESP-IDF (Native) C++ native/esp32/ Any MicroPython Python micropython/ Which SDK should I use? Arduino SDK : Best for beginners and rapid prototyping. Uses the Arduino framework and is easy to integrate into existing Arduino projects. : Best for beginners and rapid prototyping. Uses the Arduino framework and is easy to integrate into existing Arduino projects. Native ESP-IDF SDK : Best for production deployments and projects already using ESP-IDF. Offers more control and slightly better performance. : Best for production deployments and projects already using ESP-IDF. Offers more control and slightly better performance. MicroPython SDK: Best for Python developers and rapid prototyping. Works on any MicroPython board with WiFi (ESP32, ESP8266, Raspberry Pi Pico W, etc.). Quick Start 1. Get your credentials Sign up at Qrystal Uplink and create a device to get your device-id and token . 2. Choose your SDK Follow the setup guide for your preferred framework: 3. Send heartbeats Once configured, your device will send periodic heartbeats. When the Qrystal Uplink dashboard shows your device status as "Healthy", you're all set. API Reference Both SDKs return status codes to indicate the result of each heartbeat: Status Code Description Q_OK Heartbeat sent successfully Q_QRYSTAL_ERR Server returned an error (check credentials) Q_ERR_NO_WIFI WiFi not connected Q_ERR_TIME_NOT_READY NTP time s...