Feature: Integrate ESP32 Relay Nodes with LoRa

[fionan313]

Description

Add ESP32 relay nodes with LoRa modules to extend range from 50-200m (phone-only) to 500m+ with fixed infrastructure.

Hardware

• 2x ESP32 DevKit boards
• 2x DX-LR02 LoRa modules
• OLED displays
• RGB LED modules

Tasks

Phase 1: Basic LoRa Communication

• Wire LoRa modules to ESP32
• Test basic LoRa transmission between 2 ESP32s
• Measure range on campus

Phase 2: BLE-to-LoRa Bridge

• Implement BLE GATT server on ESP32
• Create message forwarding: BLE → LoRa → BLE
• Test phone → ESP32 → ESP32 → phone relay

Phase 3: Android Integration

• Add ESP32 relay detection in Android app
• Implement automatic relay connection
• Add relay status indicator in UI

Timeline

• Week 1-2: Hardware setup and basic testing
• Week 3-4: BLE-LoRa bridge implementation
• Week 5: Android integration and campus testing

Files

• Arduino: crowdlink_esp32_oled_rgb.ino
• Android: RelayNodeScanner.kt, RelayNodeConnection.kt