ESP32 Hex Bluetooth Interpreter

I have an ESP32-WROOM module that must listen over Bluetooth to an existing third-party Android app and correctly understand the hexadecimal data it broadcasts. The job is to deliver rock-solid firmware that:

• Opens a reliable Bluetooth (Classic or BLE—whichever you judge more stable for continuous streaming) serial link.
• Receives every incoming packet from the app, parses the raw HEX string byte-by-byte, and exposes the interpreted values in a simple way (e.g., struct, JSON over serial, or clearly commented variables).
• Includes clear in-code comments so I can expand the logic later if I decide to act on those values.

I will load the code with Arduino IDE, so please keep the project compatible with that toolchain or provide a straightforward PlatformIO alternative. Along with the .ino/.cpp files, include a quick read-me that lists:

1. The Bluetooth library and profile you used.
2. How to pair the Android phone with the ESP32.
3. Expected HEX frame format with an example interpretation.

Acceptance criteria: I flash your firmware, pair my phone, start the third-party app, and immediately see the interpreted output over USB serial in the exact human-readable format you documented—no dropped bytes, no garbled characters.

If you need sample frames I can capture and forward them. Let me know any hardware assumptions before coding so we avoid surprises.