Allow any dev_id, when requesting dev_id 0.

janiversen · janiversen · commit 3263429ad7e3 · 2026-01-20T17:07:47.000+01:00
diff --git a/pymodbus/transaction/transaction.py b/pymodbus/transaction/transaction.py
@@ -176,7 +176,7 @@ async def execute(self, no_response_expected: bool, request: ModbusPDU) -> Modbu
                         self.response_future, timeout=self.comm_params.timeout_connect
                     )
                     self.count_until_disconnect= self.max_until_disconnect
-                    if response.dev_id != request.dev_id:
+                    if request.dev_id and response.dev_id != request.dev_id:
                         raise ModbusIOException(
                             f"ERROR: request uses device id={request.dev_id} but received {response.dev_id}."
                         )

Original file line number	Diff line number	Diff line change
`@@ -176,7 +176,7 @@ async def execute(self, no_response_expected: bool, request: ModbusPDU) -> Modbu`
`176`	`176`	`self.response_future, timeout=self.comm_params.timeout_connect`
`177`	`177`	`)`
`178`	`178`	`self.count_until_disconnect= self.max_until_disconnect`
`179`		`- if response.dev_id != request.dev_id:`
	`179`	`+ if request.dev_id and response.dev_id != request.dev_id:`
`180`	`180`	`raise ModbusIOException(`
`181`	`181`	`f"ERROR: request uses device id={request.dev_id} but received {response.dev_id}."`
`182`	`182`	`)`