fix: Pulizia topic legacy e discovery retention

- Rimosso vecchio topic homeassistant/sensor/voltronic/config all'avvio
- Aggiunto flag -r (retain) a tutti i discovery topics
- MQTT init eseguito immediatamente all'avvio + ogni 5 minuti
- Aggiunto unique_id e device info a tutti i sensori per HA
- mqtt-subscriber ora ascolta su 3 topic:
  - homeassistant/sensor/voltronic/command (legacy)
  - homeassistant/sensor/voltronic_inv1_raw_cmd/command
  - homeassistant/sensor/voltronic_inv2_raw_cmd/command
- Subscriber con output verbose e timestamp
- Discovery topics ora persistono dopo restart broker MQTT

Timing verificato:
- Init all'avvio: immediato
- Re-init periodico: ogni 5 minuti (300s)
- Data push: ogni 30 secondi

sources/inverter-mqtt/mqtt-subscriber.sh

@@ -8,10 +8,32 @@ MQTT_USERNAME=`cat /etc/inverter/mqtt.json | jq '.username' -r`
 MQTT_PASSWORD=`cat /etc/inverter/mqtt.json | jq '.password' -r`
 MQTT_CLIENTID=`cat /etc/inverter/mqtt.json | jq '.clientid' -r`
 
-while read rawcmd;
-do
+echo "MQTT Subscriber started for parallel inverters"
+echo "Listening on topics:"
+echo "  - $MQTT_TOPIC/sensor/${MQTT_DEVICENAME}/command (legacy single inverter)"
+echo "  - $MQTT_TOPIC/sensor/${MQTT_DEVICENAME}_inv1_raw_cmd/command (inverter #1)"
+echo "  - $MQTT_TOPIC/sensor/${MQTT_DEVICENAME}_inv2_raw_cmd/command (inverter #2)"
 
-    echo "Incoming request send: [$rawcmd] to inverter."
-    /opt/inverter-cli/bin/inverter_poller -r $rawcmd;
-
-done < <(mosquitto_sub -h $MQTT_SERVER -p $MQTT_PORT -u "$MQTT_USERNAME" -P "$MQTT_PASSWORD" -i $MQTT_CLIENTID -t "$MQTT_TOPIC/sensor/$MQTT_DEVICENAME" -q 1)
+# Subscribe to all command topics (legacy + parallel)
+mosquitto_sub \
+    -h $MQTT_SERVER \
+    -p $MQTT_PORT \
+    -u "$MQTT_USERNAME" \
+    -P "$MQTT_PASSWORD" \
+    -i $MQTT_CLIENTID \
+    -t "$MQTT_TOPIC/sensor/$MQTT_DEVICENAME/command" \
+    -t "$MQTT_TOPIC/sensor/${MQTT_DEVICENAME}_inv1_raw_cmd/command" \
+    -t "$MQTT_TOPIC/sensor/${MQTT_DEVICENAME}_inv2_raw_cmd/command" \
+    -q 1 | while read -r topic_and_payload; do
+    
+    # mosquitto_sub with -v outputs "topic payload"
+    # Extract topic and payload
+    topic=$(echo "$topic_and_payload" | cut -d' ' -f1)
+    rawcmd=$(echo "$topic_and_payload" | cut -d' ' -f2-)
+    
+    echo "[$(date)] Incoming command from $topic: [$rawcmd]"
+    
+    # Execute command on inverter
+    /opt/inverter-cli/bin/inverter_poller -r "$rawcmd"
+    
+done