ET ElectronicsTech

ET-Bus Cloud

Hosted MQTT and device dashboards for real-world IoT systems.

ET-Bus Cloud gives ESP32, ET-Bus, hydroponics, weather, relay, and sensor projects a managed MQTT endpoint, private device credentials, clean topic structure, Home Assistant discovery, and a simple customer dashboard.

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MQTT mqtt.electronicstech.co.nz
Topic sites/cambridge-shed/devices/relay-01/state
Status Prototype intake open

Why host it

Most people want the device working, not another server to maintain.

A hosted MQTT service makes ET-Bus projects easier to sell and support. Customers get secure credentials, a working dashboard, alerts, and Home Assistant connectivity without running Mosquitto, certificates, backups, or broker access control themselves.

What it includes

A practical cloud layer for ET-Bus hardware.

Hosted MQTT

Managed broker access for ET-Bus and ESP32 devices with TLS, per-device credentials, and topic isolation per customer/site.

Device Dashboard

Simple web status for relays, sensors, hydroponics, weather stations, pump nodes, and workshop monitoring.

Home Assistant Ready

MQTT discovery and clean entity naming so customer systems can connect without hand-writing YAML.

Alerts

Email alerts first, then SMS for high-value systems such as pumps, freezers, grow rooms, and remote sheds.

History

Basic online/offline status, recent telemetry, device heartbeat, and event logs for diagnosis and support.

Support Tools

Firmware version, last-seen time, RSSI, reboot reason, and command results so problems can be fixed faster.

Topic model

Clear topics make device support possible.

The first version uses a strict topic layout so customers, sites, and devices stay separate. That keeps the service safe enough to grow beyond a single test broker.

  • sites/{site_id}/devices/{device_id}/state
  • sites/{site_id}/devices/{device_id}/telemetry
  • sites/{site_id}/devices/{device_id}/command
  • sites/{site_id}/devices/{device_id}/availability
telemetry.json 
{
  "device": "relay-01",
  "site": "cambridge-shed",
  "online": true,
  "rssi": -61,
  "temperature_c": 22.8,
  "relay_1": "on",
  "uptime_s": 18422
}

Starter pricing

Small monthly plans that fit hobby and workshop systems.

Pilot

$0

For proving one small install.

  • Up to 2 devices
  • Basic MQTT access
  • Limited history

Home / Shed

$5/mo

For Home Assistant users and small remote systems.

  • Up to 10 devices
  • Home Assistant discovery
  • Email alerts

Workshop / Grow

$15/mo

For hydroponics, pumps, racks, and site monitoring.

  • Up to 35 devices
  • Longer event history
  • Priority setup support

Early access

Start with one real device and one real customer site.

Send the device type, how many sensors or relays it has, whether it needs Home Assistant, and what alerts matter.

[email protected]