Diff: measurement/Temperature.cpp

Revision:

101:dbcd3bc51758

Child:

118:e831cdb799ab

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/measurement/Temperature.cpp	Fri May 08 12:19:57 2015 +0000
@@ -0,0 +1,33 @@
+#include <stdio.h>
+#include "Temperature.h"
+#include "SmartRestConf.h"
+#include "logging.h"
+
+// Cut-off for avoiding sending similar sensor reading.
+#define THRESHOLD_PERCENT_TEMP 0.02
+// Timeout for forcing a sending even if readings are similar [seconds].
+#define TIME_LIMIT_TEMP 900
+
+size_t Temperature::read(char *buf, size_t maxLen, char *status, size_t num)
+{
+        static const char *fmt = "105,%ld,%f\r\n";
+        if (!deviceReady)
+                return 0;
+
+        float data = sensor.temp();
+        if (abs(oldValue-data) <= abs(oldValue)*THRESHOLD_PERCENT_TEMP) {
+                time_t t_interval = time(NULL) - t_start;
+                if (t_interval < TIME_LIMIT_TEMP) {
+                        return 0;
+                } else {
+                        aDebug("Temp: Timeout at %d s.\n", t_interval);
+                }
+        }
+        size_t l = snprintf(buf, maxLen, fmt, deviceID, data);
+        if (status) {
+                snprintf(status, num, "Send Temp %.2f", data);
+        }
+        oldValue = data;
+        t_start = time(NULL);
+        return l;
+}
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