retain telemetry across transport outages

tools/trikke_protocol.py

@@ -16,6 +16,7 @@ MAX_RECORDS = 8
 
 PACKET_TYPE_METADATA = 1
 PACKET_TYPE_SAMPLES = 2
+PACKET_FLAG_TIMESTAMP_DELTA_SATURATED = 0x01
 
 HEADER = struct.Struct("<4sBBBBBBHIQIII")
 METADATA = struct.Struct("<HHHH10f")
@@ -127,6 +128,11 @@ class StreamParser:
         self.startup_crc_errors = 0
         self.crc_errors = 0
 
+    @property
+    def buffered_bytes(self) -> int:
+        """Bytes retained because they do not yet form a complete frame."""
+        return len(self._buffer)
+
     def feed(self, data: bytes) -> list[Frame]:
         self._buffer.extend(data)
         frames: list[Frame] = []