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Tracking chickens with motion sensors over LoRa and MQTT (query synthesis)

Question: How can you track chickens using motion sensors over LoRa, delivered to automation via MQTT?

Scope note: “Tracking” here usually means activity, occupancy, or door/run presence heuristics—not per-bird GPS—unless you add RFID leg bands, BLE tags, or cameras (not covered in the cited LoRa/MQTT batch).

  1. Edge node (coop/run)
  2. PIR (or mmWave radar for fewer false trips) + MCU (e.g. ESP32-class) + LoRa radio.

  3. Firmware debounces motion, aggregates events (e.g. motion count per 5–15 minutes), sends small binary/JSON payloads on trigger or timer to save battery.

  4. Radio path (pick one):

  5. Plain LoRa to a gateway that speaks MQTT — patterns in OpenMQTTGateway LoRa gateway notes (subscribe/publish between LoRa and MQTT topics) and the Home Assistant exploration of ESP32 + SX1276 point-to-point links (home-assistant-lora-long-range-sensors-mqtt-exploration.md).

  6. LoRaWAN end-device → network/application server → MQTT uplink topics, as in the LoRaWAN + MQTT integration overview (lorawan-mqtt-integration-iot-application-design-hivemq.md) and MultiTech-style lora/<DEV-EUI>/... topic patterns (multitech-developer-resources-mqtt-messages-lora-topics.md).

  7. Broker + automation

  8. Mosquitto / cloud broker; Home Assistant MQTT integration or Node-RED to turn topics into entities, alerts, or history charts.

Chicken-specific practical constraints

  • False positives: wind, rodents, swinging feeders, and door movement can trigger PIR; consider radar, beam break at pop-hole height, or two sensors with simple logic.
  • Duty cycle / rate limits: LoRaWAN public networks often restrict how often nodes may transmit; bursty motion may need edge aggregation (count pulses locally, send summaries).
  • What you learn: sustained motion overnight might indicate predator stress or thermal huddling; midday spikes may be dust bathing—interpretation needs baselines (confidence: low without controlled experiments).

Meshtastic and MQTT

A Meshtastic MQTT integration thread (meshtastic-lora-mqtt-bridge-reddit-thread.md) discusses mesh ↔ MQTT bridging and default forwarding policy (e.g. 0-hop constraints). That stack is messaging/telemetry-oriented for the mesh ecosystem; for structured HA sensor flows, OpenMQTTGateway, custom gateways, or LoRaWAN application MQTT are typically simpler fits—see topic LoRa, MQTT, and gateway bridges.