82 lines
1.8 KiB
Python
Executable File
82 lines
1.8 KiB
Python
Executable File
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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# SysTec IT3000A uses CRC16-modbus
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import argparse
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import socket
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import datetime
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import random
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import time
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import crcmod.predefined
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IDENT_NR = 0
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def crc16_modbus(data: bytes) -> int:
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crc = crcmod.predefined.Crc('modbus')
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crc.update(data)
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return int(crc.hexdigest(), 16)
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def handle_systec_it3000a(req: bytes) -> bytes:
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global IDENT_NR
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if not req.startswith(b'<') or not req.endswith(b'>'):
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return b'<01>\r\n'
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req = req[1:-1]
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if len(req) > 3:
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return b'<02>\r\n'
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if req.startswith(b'RN'):
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incr = True
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elif req.startswith(b'RM'):
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incr = False
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else:
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return b'<02>\r\n'
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if incr:
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time.sleep(random.randint(0, 40) / 10.0)
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gew = random.randint(40, 4000)
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m = random.randint(1, 10)
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match m:
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case 1:
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return b'<12>\r\n'
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case 2:
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incr = False
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gew = 0
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if incr:
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IDENT_NR += 1
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now = datetime.datetime.now()
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data = f'0000{now:%d.%m.%y%H:%M}{IDENT_NR if incr else 0:4}1{gew:8}{0:8}{gew:8}kg {1:3}'.encode('ascii')
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return b'<' + data + f'{crc16_modbus(data):8}'.encode('ascii') + b'>\r\n'
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def main() -> None:
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s = socket.socket()
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s.bind(('0.0.0.0', 1234))
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s.listen()
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print('Ready for connections')
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while True:
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c, a = s.accept()
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print(f'Accepting connection from {a}')
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try:
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while True:
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req = c.recv(1024)
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print(req.decode('ascii'), end='')
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res = handle_systec_it3000a(req)
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print(res.decode('ascii'), end='')
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c.send(res)
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except:
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pass
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if __name__ == '__main__':
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parser = argparse.ArgumentParser()
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args = parser.parse_args()
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main()
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