Add timestamp and window size for filter1 error

src/Filter_Obs.cpp

@@ -220,6 +220,8 @@ int Filter_Obs::lowpass_PLASMON_1Hz(buffer_obs* buffer_in,
     long this_msec = 0;
     struct timespec last_timespec;
     struct timespec this_timespec;
+    // Timestamp as string for logging
+    std::string timestamp;
 
 
     // =====================================================================
@@ -364,7 +366,12 @@ int Filter_Obs::lowpass_PLASMON_1Hz(buffer_obs* buffer_in,
                         // if we get here, it means we don't have enough data to filter. A block probably got shortened.
                         // In this case, set data value to NaN
                         filter_data_temp->set_values_MD();
-                        fprintf(stderr, "no filter1!\n");
+                        filter_data_temp->median_time(&tofilter1);
+                        filter_data_temp->string(&timestamp,0);
+                        std::cerr << "[" << timestamp << "]: "
+                        		  << "no filter1 - "
+								  << tofilter1.size()
+								  << std::endl;
                         break;
                 }