openevse-mqtt-ha-discovery

Respond to OpenEVSE data published to an MQTT broker and create the corresponding Home Assistant via MQTT Discovery entries.

Usage

Kubernetes StatefulSet

---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: openevse-mqtt-ha-discovery
spec:
  selector:
    matchLabels:
      app: openevse-mqtt-ha-discovery
  replicas: 1
  template:
    metadata:
      labels:
        app: openevse-mqtt-ha-discovery
    spec:
      terminationGracePeriodSeconds: 0
      containers:
        - env:
            - name: MQTT_BROKER
              value: mqtt.broker.name.com
            - name: MQTT_USERNAME
              value: mqtt_user
            - name: MQTT_PASSWORD
              value: itsasecret
            - name: HA_DISCOVERY_PREFIX
              value: ha-discovery
          image: jlrgraham/openevse-mqtt-ha-discovery:latest
          imagePullPolicy: Always
          name: openevse-mqtt-ha-discovery
      restartPolicy: Always

Settings

All settings are taken from environmental variables at runtime.

Variable	Description	Default
`OPENEVSE_ANNOUNCE_MQTT_PREFIX`	The prefix under which OpenEVSE device(s) publish data.	`openevse/announce`
`MQTT_BROKER`	The hostname or IP of the MQTT broker.	`mqtt`
`MQTT_PORT`	The connection port on the MQTT broker. If set to 8883 TLS is automatically used.	8883
`MQTT_CLIENT_ID`	The client name given to the MQTT broker. See MQTT Connections for more details.	`openevse-mqtt-ha-discovery`
`MQTT_USERNAME`	The username for the MQTT broker.	`None`
`MQTT_PASSWORD`	The password for the MQTT broker.	`None`
`HA_DISCOVERY_PREFIX`	The configured Home Assistant discovery prefix.	`homeassistant`

MQTT Connections

Authentication

Authentication will be attempted only if both MQTT_USERNAME and MQTT_PASSWORD are supplied.

Client ID

The MQTT client ID can be configured with the MQTT_CLIENT_ID variable. This should generally be fixed for a given deployment.

TLS

If the MQTT broker port configuration is set to 8883 then the connector will automatically attempt to enable TLS for the connection to the broker. The standard Python certifi package will be used for CA roots, so public certs (ie: Let's Encrypt + others) should just work.

MQTT Topics

There are two topic configuration controls: OPENEVSE_ANNOUNCE_MQTT_PREFIX and HA_DISCOVERY_PREFIX.

The OPENEVSE_ANNOUNCE_MQTT_PREFIX setting will control the top level prefix in MQTT used for OpenEVSE data. This will result in a subscription to <OPENEVSE_ANNOUNCE_MQTT_PREFIX>/+ (looking for published events of the form openevse/announce/abcd where abcd is the truncaed OpenEVSE device ID).

NB: To accomodate multiple OpenEVSE devices, the MQTT "Base-topic" setting on the OpenEVSE should be set to something like openevse/openevse-abcd.

The HA_DISCOVERY_PREFIX setting should match discovery prefix setting in Home Assistant.

DockerHub Image

This script is available in a Docker image from: https://hub.docker.com/repository/docker/jlrgraham/openevse-mqtt-ha-discovery/