Add rate option to Container

src/yamcs/pymdb/containers.py

@@ -76,6 +76,7 @@ def __init__(
         long_description: str | None = None,
         extra: Mapping[str, str] | None = None,
         bits: int | None = None,
+        rate: float | None = None,
         hint_partition: bool = False,
     ):
         self.name: str = name
@@ -109,6 +110,17 @@ def __init__(
         included.
         """
 
+        self.rate: float | None = rate
+        """
+        Expected rate in seconds.
+
+        This is used by Yamcs to determine parameter expiration. A parameter's
+        realtime value is considered expired when ``1.9 * rate`` has passed
+        without a new update (where ``1.9`` is a configurable tolerance multiplier).
+
+        If ``None``, the contained parameters are not checked for expiration.
+        """
+
         self.hint_partition: bool = hint_partition
         """
         Hint that this container's name should be used for partitioning when

src/yamcs/pymdb/xtce.py

@@ -1670,6 +1670,10 @@ def add_sequence_container(self, parent: ET.Element, container: Container):
         if extra:
             self.add_ancillary_data(el, extra)
 
+        if container.rate is not None:
+            rate_el = ET.SubElement(el, "DefaultRateInStream")
+            rate_el.attrib["maximumValue"] = _to_xml_value(container.rate)
+
         if container.bits is not None:
             encoding_el = ET.SubElement(el, "BinaryEncoding")
             size_el = ET.SubElement(encoding_el, "SizeInBits")