Feature/simulator addressing (#2258)

pymodbus-dev · Jul 23, 2024 · d329475 · d329475
1 parent 1b2cb7e
commit d329475
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diff --git a/doc/source/library/simulator/config.rst b/doc/source/library/simulator/config.rst
@@ -68,6 +68,9 @@ The entry “framer” allows the following values:
 - “tls” to use :class:`pymodbus.framer.ModbusTlsFramer`,
 - “socket” to use :class:`pymodbus.framer.ModbusSocketFramer`.
 
+Optional entry "device_id" will limit server to only accept a single id. If
+not set, the server will accept all device id.
+
 .. warning::
 
     not all "framer" types can be used with all “comm” types.

diff --git a/pymodbus/server/simulator/http_server.py b/pymodbus/server/simulator/http_server.py
@@ -154,7 +154,14 @@ def __init__(
         self.datastore_context = ModbusSimulatorContext(
             device, custom_actions_dict or {}
         )
-        datastore = ModbusServerContext(slaves=self.datastore_context, single=True)
+        datastore = None
+        if "device_id" in server:
+            # Designated ModBus unit address. Will only serve data if the address matches
+            datastore = ModbusServerContext(slaves={int(server["device_id"]): self.datastore_context}, single=True)
+        else:
+            # Will server any request regardless of addressing
+            datastore = ModbusServerContext(slaves=self.datastore_context, single=True)
+
         comm = comm_class[server.pop("comm")]
         framer = server.pop("framer")
         if "identity" in server: