Home Assistant auto-discovery
This commit is contained in:
159
snmp2mqtt.py
159
snmp2mqtt.py
@@ -51,40 +51,56 @@ class DeviceMonitorThread(threading.Thread):
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logging.info(f"Starting monitoring thread for device: {self.device_name} ({self.device_config['ip']})")
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try:
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# Setup MQTT connection and Home Assistant config
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ha_config = ha_create_config(self.req)
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# Setup MQTT connection
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client = connect_mqtt(self.mqtt_config)
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client.loop_start()
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config_topic = f"homeassistant/device/{ha_config['dev']['ids']}/config"
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state_topic = ha_config['state_topic']
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state_topic = f"SNMP/{self.device_name}/state"
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availability_topic = f"SNMP/{self.device_name}/availability"
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logging.info(f"[{self.device_name}] MQTT client connected, starting monitoring loop")
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logging.info(f"[{self.device_name}] MQTT client connected")
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# Publish Home Assistant autodiscovery configuration (only once on startup)
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publish_ha_autodiscovery_config(client, self.req)
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# Mark device as available
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publish(availability_topic, client, "online", True, 1)
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logging.info(f"[{self.device_name}] Starting monitoring loop")
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# Main monitoring loop
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while not shutdown_event.is_set():
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try:
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# Publish Home Assistant configuration
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publish(config_topic, client, ha_config, True, 0)
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logging.debug(f"[{self.device_name}] Published config to {config_topic}")
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# Get SNMP data and publish state
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state = asyncio.run(get_snmp(self.req))
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publish(state_topic, client, state, False, 0)
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logging.debug(f"[{self.device_name}] Published state to {state_topic}: {json.dumps(state)}")
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# Update availability (heartbeat)
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publish(availability_topic, client, "online", False, 1)
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except Exception as e:
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logging.error(f"[{self.device_name}] Error in monitoring loop: {e}")
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# Mark as offline on error
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publish(availability_topic, client, "offline", False, 1)
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# Wait for next iteration or shutdown signal
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shutdown_event.wait(timeout=self.sleep_interval)
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# Cleanup
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# Cleanup - mark device as offline
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publish(availability_topic, client, "offline", True, 1)
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client.loop_stop()
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client.disconnect()
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logging.info(f"[{self.device_name}] Monitoring thread stopped gracefully")
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except Exception as e:
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logging.error(f"[{self.device_name}] Fatal error in monitoring thread: {e}")
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# Try to mark as offline on fatal error
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try:
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publish(availability_topic, client, "offline", True, 1)
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client.disconnect()
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except:
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pass
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logging.info(f"[{self.device_name}] Thread {self.name} finished")
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@@ -174,7 +190,11 @@ def connect_mqtt(mqtt_config):
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def publish(topic, client, data, retain, qos):
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msg = json.dumps(data)
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if isinstance(data, str):
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msg = data
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else:
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msg = json.dumps(data)
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result = client.publish(topic=topic, payload=msg, qos=qos, retain=bool(retain))
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status = result[0]
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if status == 0:
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@@ -217,38 +237,93 @@ async def get_snmp(req):
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return data
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def ha_create_config(req):
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ha_config = {}
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device = {
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"ids": f"{req['device_name']}_{req['ip']}".replace(".", "_"),
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"name": req['device_name'],
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}
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origin = {
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"name": "snmp2mqtt"
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}
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ha_config.update({"dev": device, "o": origin})
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ha_config.update({"state_topic": f"SNMP/{req['device_name']}/state"})
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ha_config.update({"qos": 2})
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cmps = {}
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def create_ha_device_info(req):
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"""Create device information for Home Assistant MQTT Discovery"""
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return {
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"identifiers": [f"snmp2mqtt_{req['device_name']}_{req['ip']}".replace(".", "_")],
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"name": req['device_name'],
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"model": "SNMP Device",
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"manufacturer": "Network Equipment",
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"via_device": "snmp2mqtt"
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}
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def create_ha_sensor_config(req, oid):
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"""Create Home Assistant MQTT Discovery configuration for a single sensor"""
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device_info = create_ha_device_info(req)
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sensor_id = f"{req['device_name']}_{req['ip']}_{oid['name']}".replace(".", "_")
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config = {
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"name": f"{req['device_name']} {oid['name']}",
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"unique_id": sensor_id,
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"state_topic": f"SNMP/{req['device_name']}/state",
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"value_template": f"{{{{ value_json.{oid['name']} }}}}",
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"device": device_info,
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"origin": {
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"name": "snmp2mqtt",
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"sw_version": "1.0.0",
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"support_url": "https://git.antoineve.me/AntoineVe/snmp2mqtt"
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}
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}
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# Add device class if specified
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if 'HA_device_class' in oid:
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config['device_class'] = oid['HA_device_class']
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# Add unit of measurement if specified
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if 'HA_unit' in oid:
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config['unit_of_measurement'] = oid['HA_unit']
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# Add icon based on device class
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icon_mapping = {
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'data_size': 'mdi:network',
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'connectivity': 'mdi:network-outline',
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'power_factor': 'mdi:gauge',
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'temperature': 'mdi:thermometer',
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'signal_strength': 'mdi:signal'
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}
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if 'HA_device_class' in oid and oid['HA_device_class'] in icon_mapping:
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config['icon'] = icon_mapping[oid['HA_device_class']]
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# Add availability topic
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config['availability'] = {
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"topic": f"SNMP/{req['device_name']}/availability",
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"payload_available": "online",
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"payload_not_available": "offline"
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}
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return config
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def get_ha_discovery_topic(req, oid):
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"""Get the correct Home Assistant MQTT Discovery topic for a sensor"""
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platform = oid['HA_platform'] # 'sensor' or 'binary_sensor'
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node_id = req['device_name']
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object_id = f"{req['device_name']}_{oid['name']}".replace(".", "_")
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# Format: homeassistant/<platform>/<node_id>/<object_id>/config
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return f"homeassistant/{platform}/{node_id}/{object_id}/config"
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def publish_ha_autodiscovery_config(client, req):
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"""Publish Home Assistant MQTT Discovery configuration for all sensors of a device"""
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logging.info(f"[{req['device_name']}] Publishing Home Assistant autodiscovery configuration")
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# Publish availability as online
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availability_topic = f"SNMP/{req['device_name']}/availability"
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publish(availability_topic, client, "online", True, 1)
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# Publish discovery configuration for each OID/sensor
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for oid in req['oids']:
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cmps.update(
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{
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f"{req['device_name']}_{req['ip']}_{oid['name']}".replace(".", "_"):
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{
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"p": oid['HA_platform'],
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"device_class": oid['HA_device_class'],
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"value_template": f"{{{{ value_json.{oid['name']}}}}}",
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"unique_id": f"{req['device_name']}_{req['ip']}_{oid['name']}".replace(".", "_"),
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"name": oid['name']
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}
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})
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if "HA_unit" in oid.keys():
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cmps.update(
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{f"{req['device_name']}_{req['ip']}_{oid['name']}".replace(".", "_"):
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{"unit_of_measurement": oid['HA_unit']}})
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ha_config.update({"cmps": cmps})
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logging.debug(f"config : {json.dumps(ha_config)}")
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return ha_config
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config = create_ha_sensor_config(req, oid)
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topic = get_ha_discovery_topic(req, oid)
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# Publish with retain=True so HA discovers it after restarts
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publish(topic, client, config, True, 1)
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logging.info(f"[{req['device_name']}] Published discovery config for {oid['name']} to {topic}")
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# Small delay to avoid overwhelming the broker
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time.sleep(0.1)
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def signal_handler(signum, frame):
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