feat: Auto-detection inverter paralleli con script dedicati

- Modificato entrypoint.sh per rilevare automaticamente inverter paralleli
- Usa flag -p per parallel discovery (testa QPGS0-9)
- Script mqtt-push-parallel.sh per pubblicare dati di ogni inverter
- Script mqtt-init-parallel.sh per discovery topics (ogni 10 min)
- Naming: voltronic_inv1, voltronic_inv2, ecc.
- Fallback automatico a single-mode se PARALLEL_COUNT=0

Nota: Il parallel discovery richiede che inverter supportino comandi QPGS

sources/inverter-mqtt/mqtt-init-parallel.sh

@@ -0,0 +1,90 @@
+#!/bin/bash
+#
+# MQTT Discovery for Parallel Inverters
+# Registers Home Assistant auto-discovery topics for each parallel inverter
+
+MQTT_CONFIG="/etc/inverter/mqtt.json"
+INVERTER_BIN="/opt/inverter-cli/bin/inverter_poller"
+
+MQTT_SERVER=$(jq -r '.server' "$MQTT_CONFIG")
+MQTT_PORT=$(jq -r '.port' "$MQTT_CONFIG")
+MQTT_TOPIC=$(jq -r '.topic' "$MQTT_CONFIG")
+MQTT_DEVICENAME=$(jq -r '.devicename' "$MQTT_CONFIG")
+MQTT_USERNAME=$(jq -r '.username' "$MQTT_CONFIG")
+MQTT_PASSWORD=$(jq -r '.password' "$MQTT_CONFIG")
+MQTT_CLIENTID=$(jq -r '.clientid' "$MQTT_CONFIG")
+
+registerTopic () {
+    local inverter_id="$1"
+    local metric="$2"
+    local unit="$3"
+    local icon="$4"
+    
+    local device_name="${MQTT_DEVICENAME}_inv${inverter_id}"
+    
+    mosquitto_pub \
+        -h $MQTT_SERVER \
+        -p $MQTT_PORT \
+        -u "$MQTT_USERNAME" \
+        -P "$MQTT_PASSWORD" \
+        -i "${MQTT_CLIENTID}_init" \
+        -t "$MQTT_TOPIC/sensor/${device_name}_${metric}/config" \
+        -r \
+        -m "{
+            \"name\": \"${device_name}_${metric}\",
+            \"unit_of_measurement\": \"$unit\",
+            \"state_topic\": \"$MQTT_TOPIC/sensor/${device_name}_${metric}\",
+            \"icon\": \"mdi:$icon\",
+            \"unique_id\": \"${device_name}_${metric}\",
+            \"device\": {
+                \"identifiers\": [\"${device_name}\"],
+                \"name\": \"${device_name}\",
+                \"manufacturer\": \"Voltronic\",
+                \"model\": \"Parallel Inverter\"
+            }
+        }"
+}
+
+register_inverter_topics() {
+    local inverter_id="$1"
+    
+    echo "Registering MQTT discovery topics for: ${MQTT_DEVICENAME}_inv${inverter_id}"
+    
+    # Register all metrics for this inverter
+    registerTopic "$inverter_id" "serial" "" "identifier"
+    registerTopic "$inverter_id" "mode" "" "solar-power"
+    registerTopic "$inverter_id" "AC_grid_voltage" "V" "power-plug"
+    registerTopic "$inverter_id" "AC_grid_frequency" "Hz" "current-ac"
+    registerTopic "$inverter_id" "AC_out_voltage" "V" "power-plug"
+    registerTopic "$inverter_id" "AC_out_frequency" "Hz" "current-ac"
+    registerTopic "$inverter_id" "PV_in_voltage" "V" "solar-panel-large"
+    registerTopic "$inverter_id" "PV_in_current" "A" "solar-panel-large"
+    registerTopic "$inverter_id" "PV_in_watts" "W" "solar-panel-large"
+    registerTopic "$inverter_id" "Load_pct" "%" "brightness-percent"
+    registerTopic "$inverter_id" "Load_watt" "W" "chart-bell-curve"
+    registerTopic "$inverter_id" "Load_va" "VA" "chart-bell-curve"
+    registerTopic "$inverter_id" "Battery_capacity" "%" "battery-outline"
+    registerTopic "$inverter_id" "Battery_voltage" "V" "battery-outline"
+    registerTopic "$inverter_id" "Battery_charge_current" "A" "current-dc"
+    
+    echo "  ✓ Discovery topics registered"
+}
+
+# Discover parallel inverters
+PARALLEL_DISCOVERY=$("$INVERTER_BIN" -p 2>&1)
+PARALLEL_COUNT=$(echo "$PARALLEL_DISCOVERY" | grep "PARALLEL_COUNT=" | cut -d= -f2)
+
+if [ -z "$PARALLEL_COUNT" ] || [ "$PARALLEL_COUNT" -eq 0 ]; then
+    echo "No parallel inverters found, falling back to standard init"
+    exec /opt/inverter-mqtt/mqtt-init.sh
+    exit 0
+fi
+
+echo "Found $PARALLEL_COUNT parallel inverters"
+
+# Register topics for each inverter
+for i in $(seq 1 $PARALLEL_COUNT); do
+    register_inverter_topics "$i"
+done
+
+echo "✓ All MQTT discovery topics registered for $PARALLEL_COUNT inverters"