138 lines
4.3 KiB
Python
Executable File
138 lines
4.3 KiB
Python
Executable File
'''
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_ _ ____ __ __
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Script to get NPM data via Modbus
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need parameter: port
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/usr/bin/python3 /var/www/nebuleair_pro_4g/NPM/get_data_modbus.py
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Modbus RTU
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[Slave Address][Function Code][Starting Address][Quantity of Registers][CRC]
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Pour récupérer les 5 cannaux (a partir du registre 0x80)
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Donnée actualisée toutes les 10 secondes
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Request
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\x01\x03\x00\x80\x00\x0A\xE4\x1E
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\x01 Slave Address (slave device address)
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\x03 Function code (read multiple holding registers)
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\x00\x80 Starting Address (The request starts reading from holding register address 0x80 or 128)
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\x00\x0A Quantity of Registers (Requests to read 0x0A or 10 consecutive registers starting from address 128)
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\xE4\x1E Cyclic Redundancy Check (checksum )
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'''
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import serial
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import requests
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import json
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import sys
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import crcmod
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import sqlite3
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# Connect to the SQLite database
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conn = sqlite3.connect("/var/www/nebuleair_pro_4g/sqlite/sensors.db")
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cursor = conn.cursor()
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def load_config(config_file):
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try:
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with open(config_file, 'r') as file:
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config_data = json.load(file)
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return config_data
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except Exception as e:
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print(f"Error loading config file: {e}")
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return {}
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# Load the configuration data
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config_file = '/var/www/nebuleair_pro_4g/config.json'
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config = load_config(config_file)
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npm_solo_port = config.get('NPM_solo_port', '') #port du NPM solo
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ser = serial.Serial(
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port=npm_solo_port,
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baudrate=115200,
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parity=serial.PARITY_EVEN,
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stopbits=serial.STOPBITS_ONE,
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bytesize=serial.EIGHTBITS,
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timeout = 0.5
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)
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# Define Modbus CRC-16 function
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crc16 = crcmod.predefined.mkPredefinedCrcFun('modbus')
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# Request frame without CRC
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data = b'\x01\x03\x00\x80\x00\x0A'
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# Calculate CRC
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crc = crc16(data)
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crc_low = crc & 0xFF
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crc_high = (crc >> 8) & 0xFF
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# Append CRC to the frame
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request = data + bytes([crc_low, crc_high])
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#print(f"Request frame: {request.hex()}")
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ser.write(request)
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#GET RTC TIME from SQlite
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cursor.execute("SELECT * FROM timestamp_table LIMIT 1")
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row = cursor.fetchone() # Get the first (and only) row
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rtc_time_str = row[1] # '2025-02-07 12:30:45'
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while True:
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try:
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byte_data = ser.readline()
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formatted = ''.join(f'\\x{byte:02x}' for byte in byte_data)
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#print(formatted)
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# Extract LSW (first 2 bytes) and MSW (last 2 bytes)
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lsw_channel1 = int.from_bytes(byte_data[3:5], byteorder='big')
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msw_chanel1 = int.from_bytes(byte_data[5:7], byteorder='big')
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raw_value_channel1 = (msw_chanel1 << 16) | lsw_channel1
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lsw_channel2 = int.from_bytes(byte_data[7:9], byteorder='big')
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msw_chanel2 = int.from_bytes(byte_data[9:11], byteorder='big')
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raw_value_channel2 = (msw_chanel2 << 16) | lsw_channel2
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lsw_channel3 = int.from_bytes(byte_data[11:13], byteorder='big')
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msw_chanel3 = int.from_bytes(byte_data[13:15], byteorder='big')
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raw_value_channel3 = (msw_chanel3 << 16) | lsw_channel3
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lsw_channel4 = int.from_bytes(byte_data[15:17], byteorder='big')
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msw_chanel4 = int.from_bytes(byte_data[17:19], byteorder='big')
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raw_value_channel4 = (msw_chanel1 << 16) | lsw_channel4
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lsw_channel5 = int.from_bytes(byte_data[19:21], byteorder='big')
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msw_chanel5 = int.from_bytes(byte_data[21:23], byteorder='big')
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raw_value_channel5 = (msw_chanel5 << 16) | lsw_channel5
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print(f"Channel 1 (0.2->0.5): {raw_value_channel1}")
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print(f"Channel 2 (0.5->1.0): {raw_value_channel2}")
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print(f"Channel 3 (1.0->2.5): {raw_value_channel3}")
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print(f"Channel 4 (2.5->5.0): {raw_value_channel4}")
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print(f"Channel 5 (5.0->10.): {raw_value_channel5}")
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cursor.execute('''
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INSERT INTO data_NPM_5channels (timestamp,PM_ch1, PM_ch2, PM_ch3, PM_ch4, PM_ch5) VALUES (?,?,?,?,?,?)'''
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, (rtc_time_str,raw_value_channel1,raw_value_channel2,raw_value_channel3,raw_value_channel4,raw_value_channel5))
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# Commit and close the connection
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conn.commit()
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break
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except KeyboardInterrupt:
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print("User interrupt encountered. Exiting...")
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time.sleep(3)
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exit()
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except:
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# for all other kinds of error, but not specifying which one
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print("Unknown error...")
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time.sleep(3)
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exit()
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conn.close()
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