LoRaBridge: Long-Range Sensor Link to Android App (Peer-to-Peer + Gateway)

A long-range, low-power wireless link where LoRa Node ➜ LoRa Gateway ➜ Android App streams sensor data in real time—even off-grid.

• Placement-ready skills: RF basics, low-power design, MQTT/BLE/Wi-Fi bridges, Android app integration, secure payloads.

• Looks amazing in demos: Live packets flying hundreds of meters through walls/fields, graphs on your phone, and instant alerts.

• Reusable kit: Drop in any sensor (soil, weather, energy, motion) and you’ve got a full product pipeline.

• Node A (Sensor Node): ESP32/STM32 + SX1276/78 LoRa radio reads sensor(s) and sends encrypted packets (AES-128) with CRC + sequence IDs.

• Node B (Gateway): ESP32-S3 + LoRa radio receives packets, does ACK/Retry, stores to flash if the phone is offline, then forwards via BLE or Wi-Fi to the Android app (or MQTT broker if available).

• Android App: Shows live charts, RSSI/SNR quality, node battery %, map pins, and push notifications for thresholds. Works online or offline (local BLE).

Feature highlights 🌈

• Range 2–5 km suburban (tunable SF/BW/CR).

• Store-and-forward & packet deduplication.

• OTA reconfiguration: sampling rate, Tx power, sensor enable/disable.

• Optional mesh/repeater mode for multi-hop fields.

• Edge alarms on gateway (no internet required).

• Export to CSV/JSON; auto-sync to cloud when back online.