ha_mqtt_configd: Initial version of role

roles/ha_mqtt_configd/files/ha_mqtt_configd.py

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+#!/usr/bin/env python3
+
+import hashlib
+import json
+import paho.mqtt.client as mqtt
+import socket
+import ssl
+import syslog
+import time
+
+notify = {}
+
+
+def on_message(client, userdata, msg):
+    if not msg.topic in notify:
+        syslog.syslog(syslog.LOG_INFO, f"Publish config for {msg.topic}")
+    elif notify[msg.topic] < time.monotonic() - 600:
+        syslog.syslog(syslog.LOG_INFO, f"Refresh config for {msg.topic}")
+    else:
+        return
+    topic = msg.topic.split("/")
+    uniqueid = hashlib.md5(msg.topic.encode()).hexdigest()
+    config = {
+        "dev": {
+            "name": topic[2].capitalize(),
+            "suggested_area": topic[1].capitalize(),
+            "identifiers": [
+                uniqueid,
+            ],
+        },
+        "name": "Power Usage",
+        "state_topic": msg.topic,
+        "unit_of_measurement": "W",
+        "unique_id": uniqueid,
+    }
+    client.publish(
+        topic=f"homeassistant/sensor/{uniqueid}/config", payload=json.dumps(config)
+    )
+    notify[msg.topic] = time.monotonic()
+
+
+def connect(hostname):
+    client = mqtt.Client(protocol=mqtt.MQTTv5)
+    client.tls_set(
+        certfile=f"/etc/ssl/{socket.gethostname()}.crt",
+        keyfile=f"/etc/ssl/private/{socket.gethostname()}.key",
+        ca_certs="/etc/ssl/ca.crt",
+        cert_reqs=ssl.CERT_REQUIRED,
+    )
+    client.on_message = on_message
+    client.connect(hostname, 8883)
+    syslog.syslog(syslog.LOG_INFO, f"Connected to MQTT broker {hostname}")
+    return client
+
+
+def main():
+    syslog.openlog(
+        "ha_mqtt_configd", logoption=syslog.LOG_PID, facility=syslog.LOG_DAEMON
+    )
+    client = connect(socket.gethostname())
+    try:
+        client.subscribe("home/+/+/power")
+        client.loop_forever()
+    except KeyboardInterrupt:
+        client.disconnect()
+        syslog.closelog()
+
+
+if __name__ == "__main__":
+    main()

roles/ha_mqtt_configd/files/ha_mqtt_configd.rc

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+#!/bin/ksh
+
+daemon="/usr/local/sbin/ha_mqtt_configd"
+daemon_user="ha-mqtt"
+
+. /etc/rc.d/rc.subr
+
+rc_bg=YES
+rc_reload=NO
+pexp="python3 /usr/local/sbin/ha_mqtt_configd"
+
+rc_cmd $1

roles/ha_mqtt_configd/handlers/main.yml

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+---
+- name: Restart ha_mqtt_configd
+  ansible.builtin.service:
+    name: ha_mqtt_configd
+    state: restarted

roles/ha_mqtt_configd/tasks/main.yml

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+---
+- name: Install packages
+  ansible.builtin.package:
+    name: py3-paho-mqtt
+    state: installed
+
+- name: Create group
+  ansible.builtin.group:
+    name: ha-mqtt
+    system: true
+
+- name: Create user
+  ansible.builtin.user:
+    name: ha-mqtt
+    comment: ha-mqtt-configd
+    group: ha-mqtt
+    groups: hostkey
+    create_home: false
+    home: /var/empty
+    shell: /sbin/nologin
+    system: true
+
+- name: Copy daemon
+  ansible.builtin.copy:
+    dest: /usr/local/sbin/ha_mqtt_configd
+    src: ha_mqtt_configd.py
+    mode: "0755"
+    owner: root
+    group: "{{ ansible_wheel }}"
+  notify: Restart ha_mqtt_configd
+
+- name: Copy startup script
+  ansible.builtin.copy:
+    dest: /etc/rc.d/ha_mqtt_configd
+    src: ha_mqtt_configd.rc
+    mode: "0755"
+    owner: root
+    group: "{{ ansible_wheel }}"
+  notify: Restart ha_mqtt_configd
+
+- name: Enable service
+  ansible.builtin.service:
+    name: ha_mqtt_configd
+    state: started
+    enabled: true