Allow zero node values and reduce log level

Change LOG.info to LOG.debug to reduce noise when printing node information. Add an allow_zero parameter to _node_float so callers can accept zero as a valid value (previously only positive values were returned). Update callers for exposure, gain, and DeviceLinkThroughputLimit to pass allow_zero=True so reported zeros are treated as real readings while preserving the original behavior by default.

Author: C-Achard

dlclivegui/cameras/backends/gentl_backend.py

@@ -1155,7 +1155,7 @@ def _node_value(node_map, name: str, default=None):
             return default
 
     @classmethod
-    def _node_float(cls, node_map, *names: str) -> float | None:
+    def _node_float(cls, node_map, *names: str, allow_zero: bool = False) -> float | None:
         """Return the first positive float value from a list of GenICam node names."""
         for name in names:
             value = cls._node_value(node_map, name, None)
@@ -1164,7 +1164,7 @@ def _node_float(cls, node_map, *names: str) -> float | None:
             except Exception:
                 continue
 
-            if fvalue > 0:
+            if fvalue > 0 or (allow_zero and fvalue == 0):
                 return fvalue
 
         return None
@@ -1761,6 +1761,7 @@ def _read_telemetry(self, node_map) -> None:
             "ExposureTime",
             "ExposureTimeAbs",
             "Exposure",
+            allow_zero=True,
         )
         if exposure is not None:
             self._actual_exposure = exposure
@@ -1769,6 +1770,7 @@ def _read_telemetry(self, node_map) -> None:
             node_map,
             "Gain",
             "GainRaw",
+            allow_zero=True,
         )
         if gain is not None:
             self._actual_gain = gain
@@ -1799,7 +1801,7 @@ def _read_telemetry(self, node_map) -> None:
             if exposure_auto is not None:
                 ns["actual_exposure_auto"] = exposure_auto
 
-            throughput = self._node_float(node_map, "DeviceLinkThroughputLimit")
+            throughput = self._node_float(node_map, "DeviceLinkThroughputLimit", allow_zero=True)
             if throughput is not None:
                 ns["actual_device_link_throughput_limit"] = float(throughput)