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Fermentation Data Generator

Simulates sensor readings (temperature and pH) from 3 fermentors and publishes them as MQTT messages every 3 seconds. The container runs a Mosquitto broker and the simulator together.

Build

docker build -t fermentation-simulator .

Run

docker run -d --name fermentation-sim -p 1883:1883 fermentation-simulator

Stop

docker rm -f fermentation-sim

Connecting to the broker

The container exposes the Mosquitto MQTT broker on port 1883 (no authentication required).

Setting Value
Host localhost
Port 1883
Protocol MQTT v3.1.1

Subscribe to all fermentor topics with any MQTT client, for example using mosquitto_sub:

mosquitto_sub -h localhost -p 1883 -t "fermentors/#" -v

Or subscribe to a specific metric:

mosquitto_sub -h localhost -p 1883 -t "fermentors/fermentor-1/temperature" -v

MQTT topics

fermentors/{fermentor_id}/temperature
fermentors/{fermentor_id}/ph

Payload:

{
  "fermentor_id": "fermentor-1",
  "metric": "temperature",
  "value": 36.87,
  "timestamp": "2026-03-03T10:00:02Z"
}