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#!/usr/bin/env python
# scripts/examples/simple_data_store.py
import logging
from socketserver import TCPServer
from collections import defaultdict
from umodbus import conf
from umodbus.server.tcp import RequestHandler, get_server
from umodbus.utils import log_to_stream
# Add stream handler to logger 'uModbus'.
log_to_stream(level=logging.DEBUG)
# A very simple data store which maps addresses against their values.
data_store = defaultdict(int)
# Enable values to be signed (default is False).
conf.SIGNED_VALUES = True
TCPServer.allow_reuse_address = True
app = get_server(TCPServer, ('localhost', 502), RequestHandler)
@app.route(slave_ids=[1], function_codes=[1, 2], addresses=list(range(0, 10)))
def read_data_store(slave_id, function_code, address):
"""" Return value of address. """
return data_store[address]
@app.route(slave_ids=[1], function_codes=[5, 15], addresses=list(range(0, 10)))
def write_data_store(slave_id, function_code, address, value):
"""" Set value for address. """
data_store[address] = value
if __name__ == '__main__':
try:
app.serve_forever()
finally:
app.shutdown()
app.server_close()
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