Add server example friendly message when no permission to create socket

AdvancedClimateSystems · Nov 11, 2020 · 88ea762 · 88ea762
1 parent 792d785
commit 88ea762
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Showing 2 changed files with 13 additions and 2 deletions.
diff --git a/README.rst b/README.rst
@@ -62,7 +62,12 @@ Creating a Modbus TCP server is easy:
     port = int(port)
 
     TCPServer.allow_reuse_address = True
-    app = get_server(TCPServer, (host, port), RequestHandler)
+    try:
+        app = get_server(TCPServer, (host, port), RequestHandler)
+    except PermissionError:
+        print("You don't have permission to bind on {}".format(args.bind))
+        print("Hint: try with a different port (ex: --bind localhost:50200)")
+        exit(1)
 
     @app.route(slave_ids=[1], function_codes=[1, 2], addresses=list(range(0, 10)))
     def read_data_store(slave_id, function_code, address):

diff --git a/scripts/examples/simple_tcp_server.py b/scripts/examples/simple_tcp_server.py
@@ -29,7 +29,12 @@
 port = int(port)
 
 TCPServer.allow_reuse_address = True
-app = get_server(TCPServer, (host, port), RequestHandler)
+try:
+    app = get_server(TCPServer, (host, port), RequestHandler)
+except PermissionError:
+    print("You don't have permission to bind on {}".format(args.bind))
+    print("Hint: try with a different port (ex: --bind localhost:50200)")
+    exit(1)
 
 
 @app.route(slave_ids=[1], function_codes=[1, 2], addresses=list(range(0, 10)))
@@ -43,6 +48,7 @@ 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()