mqqt_washingMachine/ROADMAP.md

ROADMAP

Goal: a small, phone-first webpage that tells whether the laundry is done, based on the washing machine's power consumption.

Priority 1

Objective: show the laundry status from the last 3 one-minute power samples of the Tasmota plug.

Decided

• Data source: MQTT topic tele/tasmota_washingmashine_C21183/SENSOR (Tasmota JSON, field ENERGY.Power in watts).
• Broker: 192.168.1.11:1883, no credentials assumed. Address, port, topic and credentials (optional) are configurable via env vars.
• Tasmota TelePeriod is 10 s, so the plug publishes about 6 messages per minute.
• Architecture: small Go backend, packaged in Docker (Dockerfile plus docker-compose example), deployed by the user on their own server.
  • Subscribes to the broker over TCP and runs continuously, whether or not any page is open.
  • Sampling: it keeps the most recent ENERGY.Power message and records one sample per minute. A minute with no message received is recorded as a missing sample.
  • Keeps the last 3 samples in memory.
  • Serves the webpage and a JSON status endpoint (e.g. /api/status). Status is computed on the backend, so a page load shows the correct state at once.
  • HTTP port is configurable, default 8080.
  • The page re-fetches the status every 60 s.
• Status rule (threshold 3 W, strictly below means idle):

Condition	Message	Color
fewer than 3 samples since backend start	"Waiting for data..."	grey
any of the last 3 samples is missing	"Incomplete data"	grey
all 3 samples under 3.00 W	"Laundry done"	default text color
otherwise (any sample 3.00 W or more)	"Laundry not yet done"	red

• Page design:
  • White background, status text very large (the main element), readable on phones (responsive, viewport meta, no horizontal scroll).
  • Below the status, the last 3 power values in normal-size black text with a W suffix and 2 decimals (e.g. 47.70W). A missing sample is shown as --.
• Access: home Wi-Fi only. No TLS or authentication in scope.
• Language: English for UI text, code comments, logs, README.

Notes

• State is in memory only. After a backend restart the page shows "Waiting for data..." until 3 samples are collected (about 3 minutes).