Diff: measurement/Signal.cpp

Revision:

101:dbcd3bc51758

Child:

118:e831cdb799ab

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/measurement/Signal.cpp	Fri May 08 12:19:57 2015 +0000
@@ -0,0 +1,48 @@
+#include <stdio.h>
+#include "Signal.h"
+#include "SmartRestConf.h"
+#include "LCDDisplay.h"
+#include "DeviceInfo.h"
+#include "logging.h"
+
+// Cut-off for avoiding sending similar sensor reading.
+#define THRESHOLD_PERCENT_SIG 0.06
+// Timeout for forcing a sending even if readings are similar [seconds].
+#define TIME_LIMIT_SIG 900
+
+
+size_t Signal::read(char *buf, size_t maxLen, char *status, size_t num)
+{
+        static const char *fmt = "104,%ld,%d,%d\r\n";
+        static char signal[27] = {0};
+        DeviceInfo::SignalQuality *p = deviceInfo.signalQuality();
+        if (p == NULL)
+                return 0;
+        else if (p && p->rssi)
+                snprintf(signal, sizeof(signal), "Network: %d dBm", p->rssi);
+        else
+                strncpy(signal, "Network: no coverage", sizeof(signal));
+        if (strcmp(LCDDisplay::inst().getSecondLine(), signal)) {
+                LCDDisplay::inst().setSecondLine(signal);
+        }
+
+        int data[2] = { p->rssi, p->ber };
+        if (abs(oldValues[0]-data[0]) <= abs(oldValues[0])*THRESHOLD_PERCENT_SIG &&
+            abs(oldValues[1]-data[1]) <= abs(oldValues[1])*THRESHOLD_PERCENT_SIG) {
+                time_t t_interval = time(NULL) - t_start;
+                if (t_interval < TIME_LIMIT_SIG) {
+                        return 0;
+                } else {
+                        aDebug("Signal: Timeout at %d s.\n", t_interval);
+                }
+        }
+
+        size_t l = snprintf(buf, maxLen, fmt, deviceID, data[0], data[1]);
+        if (status) {
+                snprintf(status, num, "Send dBm %d,%d", data[0], data[1]);
+        }
+        oldValues[0] = data[0];
+        oldValues[1] = data[1];
+        t_start = time(NULL);
+        return l;
+}
\ No newline at end of file