Bluetooth device whitelist management and directed download workflow orchestrates registration, signal-strength optimization, and batch data retrieval across field devices, mobile app, and cloud platform. Industrial control machines read local Bluetooth module parameters (MAC, port, PIN) via serial/USB/AT commands, upload device info to the cloud for site-based whitelist maintenance, and trigger app-initiated discovery. Mobile users authenticate, fetch site-specific MAC whitelists, and sequentially connect to each device to measure RSSI signal strength, then prioritize downloads from strongest-signal devices first. The system records connection status, download success/failure, timestamps, and RSSI values back to the cloud, loops until all devices are processed, and generates audit-ready reports. This pattern solves the challenge of reliable multi-device Bluetooth data collection in industrial environments where signal variability and connection failures demand intelligent queuing and comprehensive state tracking.