Seeking Established IoT Fuel Tanker Trailer Monitoring Platform

We are seeking an established IoT platform developer, software company, or IP holder to sell us an existing, commercially ready IoT Fuel Tanker Trailer Tracking and Monitoring Platform. We require full access to the source code, technical documentation, and full intellectual property (IP) transfer rights so our internal team can customize, deploy, and maintain it. We are not looking to build this from scratch—we want to buy a battle-tested, functional code baseline. Core System Architecture Requirements: 1. IoT Protocols & Hardware Ingestion: MQTT, HTTP/HTTPS APIs, TCP/UDP sockets supporting standard GPS hardware and Modbus RS480/485 digital fuel level probes/ultrasonic sensors. 2. Backend: Scalable microservices or modular architecture (e.g., Node.js, Python/FastAPI, Go, or Java/Spring Boot) using PostgreSQL/TimescaleDB or InfluxDB for time-series telemetry data. 3. Frontend: Modern, responsive dashboard (e.g., React.js, Vue.js, or Angular) optimized for multi-tenant SaaS management. 4. Mobile Apps: Cross-platform or native apps (Flutter, React Native, Swift, Kotlin) for Android/iOS (Driver & Fleet Manager views). Key Required Features: i. Multi-Chamber Fuel Monitoring: Real-time volume monitoring per compartment/chamber (capacitive probes, digital flow meters, or ultrasonic sensors) with calibration curve mapping. ii. Theft & Anomaly Detection: Real-time alerts for unauthorized discharge, sudden fuel level drops (siphoning), chamber valve opening/closing outside geofenced drop zones, and fuel theft while moving/parked. iii. Live GPS & Route Telematics: Real-time vehicle tracking, route playback, geofencing (terminals, fuel stations, drop points), over-speeding, and prolonged idling alerts. iv. Smart Dispatch & Delivery Management: Waybill/manifest tracking, digital proof of delivery (ePOD), volume before/after delivery verification, and multi-chamber discharge logs. v. Dashboard & Analytics: Modern, intuitive visual dashboards, dynamic fuel drop/fill graphs, anomaly logs, multi-tenant sub-account support, and automated PDF/Excel reporting. In your proposal, please provide: a. A live demo or video walkthrough of your operational platform. b. Details on the current tech stack, frameworks, and IoT hardware currently supported. c. Baseline pricing for Full Source Code Transfer + Perpetual Commercial Rights.