NPM: lecture registre status Modbus (reg 19) + colonne npm_status

- get_data_modbus_v3.py: requete Modbus separee pour lire le registre
  status (0x13) du NextPM apres les donnees. Stocke dans npm_status.
- create_db.py: ajout colonne npm_status (INTEGER DEFAULT 0) dans
  data_NPM + migration ALTER TABLE pour bases existantes.
- En cas d'erreur de lecture status, garde 0xFF (toutes erreurs).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

NPM/get_data_modbus_v3.py

@@ -72,6 +72,7 @@ channel_4 = 0
 channel_5 = 0
 relative_humidity = 0
 temperature = 0
+npm_status = 0xFF  # Default: all errors (will be overwritten if read succeeds)
 
 try:
     # Initialize serial port
@@ -176,6 +177,29 @@ try:
     #print(f"Internal Relative Humidity: {relative_humidity} %")
     #print(f"Internal temperature: {temperature} °C")
 
+    # Read NPM status register (register 19 = 0x13, 1 register)
+    # Modbus request: slave=0x01, func=0x03, addr=0x0013, qty=0x0001
+    status_request = b'\x01\x03\x00\x13\x00\x01'
+    status_crc = crc16(status_request)
+    status_request += bytes([status_crc & 0xFF, (status_crc >> 8) & 0xFF])
+
+    ser.flushInput()
+    ser.write(status_request)
+    time.sleep(0.2)
+
+    # Response: addr(1) + func(1) + byte_count(1) + data(2) + crc(2) = 7 bytes
+    status_response = ser.read(7)
+    if len(status_response) == 7:
+        status_recv_crc = int.from_bytes(status_response[-2:], byteorder='little')
+        status_calc_crc = crc16(status_response[:-2])
+        if status_recv_crc == status_calc_crc:
+            npm_status = int.from_bytes(status_response[3:5], byteorder='big') & 0xFF
+            print(f"NPM status: 0x{npm_status:02X} ({npm_status})")
+        else:
+            print("[WARNING] NPM status CRC check failed, keeping default")
+    else:
+        print(f"[WARNING] NPM status incomplete response ({len(status_response)} bytes)")
+
     ser.close()
 
 except Exception as e:
@@ -189,8 +213,8 @@ finally:
     , (rtc_time_str, channel_1, channel_2, channel_3, channel_4, channel_5))
 
     cursor.execute('''
-    INSERT INTO data_NPM (timestamp,PM1, PM25, PM10, temp_npm, hum_npm) VALUES (?,?,?,?,?,?)'''
-    , (rtc_time_str, pm1_10s, pm25_10s, pm10_10s, temperature, relative_humidity))
+    INSERT INTO data_NPM (timestamp,PM1, PM25, PM10, temp_npm, hum_npm, npm_status) VALUES (?,?,?,?,?,?,?)'''
+    , (rtc_time_str, pm1_10s, pm25_10s, pm10_10s, temperature, relative_humidity, npm_status))
 
     # Commit and close the connection
     conn.commit()