ESPGeiger MQTT Output
ESPGeiger uses MQTT to publish radiation data from your Geiger counter. This section details its interaction with MQTT brokers.
- ESPGeiger transmits radiation statistics every minute. This can be configured.
- By default, it connects to the MQTT broker on the standard port
1883 - ESPGeiger publishes data to a base topic named:
ESPGeiger‑<device_id>
Published Topics
| Topic | Description | Example Value | Publish Interval Default |
|---|---|---|---|
ESPGeiger-<device_id>/tele/lwt | Last Will and Testament (LWT) topic. Indicates ESPGeiger’s connection status to the MQTT broker. | Online | Online published when MQTT connection established. Offline set as LWT. |
ESPGeiger-<device_id>/stat/CPM | Current Counts Per Minute (CPM) value. | 30.0 | 60 |
ESPGeiger-<device_id>/stat/CPM5 | Average CPM over the last 5 minutes. | 30.0 | 60 |
ESPGeiger-<device_id>/stat/CPM15 | Average CPM over the last 15 minutes. | 30.0 | 60 |
ESPGeiger-<device_id>/stat/uSv | Current microSieverts per hour (μSv) value. | 0.10 | 60 |
ESPGeiger-<device_id>/stat/HV | Current HV circuit value - ESPGeigerHW only. | 400.1 | 60 |
ESPGeiger-<device_id>/stat/WARN | Triggered when over Warning threshold. | 0 / 1 | - |
ESPGeiger-<device_id>/stat/ALERT | Triggered when over Alert threshold. | 0 / 1 | - |
ESPGeiger-<device_id>/tele/status | Current status of ESPGeiger in JSON format. | (status_json) | 60 |
Example Tele Status JSON Output
{"uptime":"2T01:45:10","board":"ESP32","model":"GC10next","free_mem":191552,"ssid":"Wifi","ip":"192.168.1.123","rssi":-24}