bugfix

Author: sgillen

greenwave_monitor/greenwave_monitor/test_utils.py

@@ -178,7 +178,7 @@ def find_best_diagnostic(
     """Find the diagnostic message with frequency closest to expected."""
     best_status = None
     best_values = None
-    best_diff = None
+    best_diff = float('inf')
 
     for status in diagnostics:
         node_str = None

greenwave_monitor/include/message_diagnostics.hpp

@@ -100,7 +100,7 @@ class MessageDiagnostics
     prev_timestamp_node_us_ = std::numeric_limits<uint64_t>::min();
     prev_timestamp_msg_us_ = std::numeric_limits<uint64_t>::min();
     num_non_increasing_msg_ = 0;
-    message_latency_msg_ms_ = std::numeric_limits<double>::quiet_NaN();
+    message_latency_msg_ms_ = 0;
     outdated_msg_ = true;
 
     diagnostic_publisher_ =