Diff: measurement/LocationUpdate.cpp

Revision:

71:063c45e99578

Parent:

58:4cc0ae5a7058

Child:

72:c5709ae7b193

--- a/measurement/LocationUpdate.cpp	Tue Feb 10 20:52:13 2015 +0000
+++ b/measurement/LocationUpdate.cpp	Mon Feb 16 09:17:30 2015 +0000
@@ -5,6 +5,9 @@
 #include "IntegerValue.h"
 #include "FloatValue.h"
 
+#define THRESHOLD_PERCENT_LOC 0.05       // Percentage cut-off for avoiding sending similar acceleration sensor data.
+#define TIME_LIMIT_LOC 900               // Time interval for forcing a sending even if acceleration sensor readings are constantly similar.
+
 LocationUpdate::LocationUpdate(AbstractSmartRest& client, SmartRestTemplate& tpl, long& deviceId, GPSTracker& gpsTracker) :
     _client(client),
     _tpl(tpl),
@@ -12,6 +15,10 @@
     _gpsTracker(gpsTracker)
 {
     _init = false;
+    oldValues[0] = 0;
+    oldValues[1] = 0;
+    oldValues[2] = 0;
+    sendingTimer.start();
 }
 
 bool LocationUpdate::init()
@@ -41,9 +48,22 @@
         puts("No GPS data available.");
         return true;
     }
+    float data[3] = { 0.0, 0.0, 0.0 };
+    data[0] = position.altitude;
+    data[1] = position.latitude;
+    data[2] = position.longitude;
+    if (abs(oldValues[0]-data[0]) <= abs(oldValues[0])*THRESHOLD_PERCENT_LOC &&
+        abs(oldValues[1]-data[1]) <= abs(oldValues[1])*THRESHOLD_PERCENT_LOC &&
+        abs(oldValues[2]-data[2]) <= abs(oldValues[2])*THRESHOLD_PERCENT_LOC) {
+        if (sendingTimer.read() < TIME_LIMIT_LOC) {
+            printf("Similar location readings found, no sending!\r\n");
+            return true;
+        } else {
+            printf("Sending timer of location sensor timed out at %f s, a sending is forced.\r\n", sendingTimer.read());
+        }
+    }
         
     puts("Starting measurement sending.");
-
     Aggregator aggregator;
     ComposedRecord record1, record2;
     IntegerValue msgId1(108);
@@ -67,5 +87,10 @@
     }
 
     _client.stop();
+    oldValues[0] = data[0];
+    oldValues[1] = data[1];
+    oldValues[2] = data[2];
+    sendingTimer.reset();
+    printf("Location readings sent.\r\n");
     return true;
 }