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How to stop server from example code? #121

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@William-Durand

This is more a question than an issue.

I try to make a modbus server in a python thread but I don't know how to stop it.
I took the exact code I found in the example part of documentation.
I set up my app ("get_server(TCPServer, self.interface, RequestHandler)") and I ran this code inside my thread:

            try:
                app.serve_forever()
            finally:
                app.shutdown()
                app.server_close()

Everything works fine except I have to stop my program manually because my thread never stop.
The question is: how to stop the "app.serve_forever()" part when I don't need my server anymore?

Just in case, I created an event called "stop_event" which can be set whenever I want to.
But I don't really know how to use it to force the server to stop.

Best regards.

Activity

  1. changed the title [-]How to stop server from exemple code?[/-] [+]How to stop server from example code?[/+] on Jul 12, 2022
  2. grgmm commented on Dec 2, 2022

    @grgmm

    Hi, I have the same issue, please somebody can help us?

  3. tiagocoutinho commented on Dec 4, 2022

    @tiagocoutinho
    Contributor

    Here is an example adapted from scripts/examples/simple_tcp_server.py (you will need python >= 3.6):

    import time
    from socketserver import TCPServer
    from collections import defaultdict
    from threading import Thread
    
    from umodbus import conf
    from umodbus.server.tcp import RequestHandler, get_server
    
    # A very simple data store which maps addresses against their values.
    data_store = defaultdict(int)
    
    TCPServer.allow_reuse_address = True
    app = get_server(TCPServer, ("", 5020), 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
    
    def serve(): 
        with app:
            app.serve_forever()
    
    def main():
        server = Thread(target=serve)
        server.start()
        try:
            # whatever main loop you decide to run
            while True:
                time.sleep(1)
        finally:
            app.shutdown()
            server.join()
    
    if __name__ == "__main__":
        main()

    I'm not sure if this is what you're looking for but if you press Ctrl-C it should stop the server running on the other thread.

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