Fix pymodbus-dev#657 (pymodbus-dev#659) Use _in_waiting only for seri…

…al clients
camtarn · Aug 1, 2021 · 7c9da53 · 7c9da53
1 parent ff6568d
commit 7c9da53
Showing 1 changed file with 6 additions and 5 deletions.
diff --git a/pymodbus/transaction.py b/pymodbus/transaction.py
@@ -247,11 +247,12 @@ def _retry_transaction(self, retries, reason,
             time.sleep(delay)
             _logger.debug("Sleeping {}".format(delay))
         self.client.connect()
-        in_waiting = self.client._in_waiting()
-        if in_waiting:
-            if response_length == in_waiting:
-                result = self._recv(response_length, full)
-                return result, None
+        if hasattr(self.client, "_in_waiting"):
+            in_waiting = self.client._in_waiting()
+            if in_waiting:
+                if response_length == in_waiting:
+                    result = self._recv(response_length, full)
+                    return result, None
         return self._transact(packet, response_length, full=full)
 
     def _transact(self, packet, response_length,