Fronius Inverter Integration Module Development

I need a code module to integrate with Fronius inverter APIs. The module should retrieve energy production telemetry and control inverters via MQTT.

Key Requirements:
- Connect to REST APIs for live/near real-time telemetry.
- Push data to MQTT broker using provided topic/payload structure.
- Implement onboarding REST API endpoint to register/link inverters to a "site", with metadata in PostgreSQL.
- Enable control actions via MQTT and REST API:
- Start/stop inverter
- Set power output
- Reset inverter
- Charge/discharge connected battery

Ideal Skills:
- Proficiency in Rust
- Experience with REST APIs, MQTT, PostgreSQL
- Familiarity with energy systems and telemetry is a plus

Looking for a developer who can efficiently deliver this integration.