Cumulocity Official / Mbed 2 deprecated MbedSmartRestMain Featured

Official reference client implementation for Cumulocity SmartREST on u-blox C027.

Dependencies:   C027_Support C12832 LM75B MMA7660 MbedSmartRest mbed-rtos mbed

Fork of MbedSmartRestMain by Vincent Wochnik

measurement/Signal.cpp@123:3e4a1ed4bad5, 2015-05-27 (annotated)

Committer:
xinlei
Date:
Wed May 27 09:22:24 2015 +0000
Revision:
123:3e4a1ed4bad5
Parent:
118:e831cdb799ab
Child:
124:311fa85af2b3
Temporary work-around for long polling when server not properly close connection.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
xinlei 101:dbcd3bc51758 1 #include <stdio.h>
xinlei 101:dbcd3bc51758 2 #include "Signal.h"
xinlei 101:dbcd3bc51758 3 #include "SmartRestConf.h"
xinlei 101:dbcd3bc51758 4 #include "LCDDisplay.h"
xinlei 101:dbcd3bc51758 5 #include "DeviceInfo.h"
xinlei 101:dbcd3bc51758 6 #include "logging.h"
xinlei 101:dbcd3bc51758 7
xinlei 101:dbcd3bc51758 8 // Cut-off for avoiding sending similar sensor reading.
xinlei 101:dbcd3bc51758 9 #define THRESHOLD_PERCENT_SIG 0.06
xinlei 101:dbcd3bc51758 10 // Timeout for forcing a sending even if readings are similar [seconds].
xinlei 101:dbcd3bc51758 11 #define TIME_LIMIT_SIG 900
xinlei 101:dbcd3bc51758 12
xinlei 101:dbcd3bc51758 13
xinlei 101:dbcd3bc51758 14 size_t Signal::read(char *buf, size_t maxLen, char *status, size_t num)
xinlei 101:dbcd3bc51758 15 {
xinlei 101:dbcd3bc51758 16 static const char *fmt = "104,%ld,%d,%d\r\n";
xinlei 101:dbcd3bc51758 17 static char signal[27] = {0};
xinlei 101:dbcd3bc51758 18 DeviceInfo::SignalQuality *p = deviceInfo.signalQuality();
xinlei 123:3e4a1ed4bad5 19
xinlei 123:3e4a1ed4bad5 20 if (p && p->rssi)
xinlei 101:dbcd3bc51758 21 snprintf(signal, sizeof(signal), "Network: %d dBm", p->rssi);
xinlei 101:dbcd3bc51758 22 else
xinlei 101:dbcd3bc51758 23 strncpy(signal, "Network: no coverage", sizeof(signal));
xinlei 101:dbcd3bc51758 24 if (strcmp(LCDDisplay::inst().getSecondLine(), signal)) {
xinlei 101:dbcd3bc51758 25 LCDDisplay::inst().setSecondLine(signal);
xinlei 101:dbcd3bc51758 26 }
xinlei 123:3e4a1ed4bad5 27 if (p == NULL)
xinlei 123:3e4a1ed4bad5 28 return 0;
xinlei 101:dbcd3bc51758 29
xinlei 101:dbcd3bc51758 30 int data[2] = { p->rssi, p->ber };
xinlei 101:dbcd3bc51758 31 if (abs(oldValues[0]-data[0]) <= abs(oldValues[0])*THRESHOLD_PERCENT_SIG &&
xinlei 101:dbcd3bc51758 32 abs(oldValues[1]-data[1]) <= abs(oldValues[1])*THRESHOLD_PERCENT_SIG) {
xinlei 101:dbcd3bc51758 33 time_t t_interval = time(NULL) - t_start;
xinlei 101:dbcd3bc51758 34 if (t_interval < TIME_LIMIT_SIG) {
xinlei 101:dbcd3bc51758 35 return 0;
xinlei 101:dbcd3bc51758 36 }
xinlei 101:dbcd3bc51758 37 }
xinlei 101:dbcd3bc51758 38
xinlei 101:dbcd3bc51758 39 size_t l = snprintf(buf, maxLen, fmt, deviceID, data[0], data[1]);
xinlei 101:dbcd3bc51758 40 if (status) {
xinlei 101:dbcd3bc51758 41 snprintf(status, num, "Send dBm %d,%d", data[0], data[1]);
xinlei 101:dbcd3bc51758 42 }
xinlei 101:dbcd3bc51758 43 oldValues[0] = data[0];
xinlei 101:dbcd3bc51758 44 oldValues[1] = data[1];
xinlei 101:dbcd3bc51758 45 t_start = time(NULL);
xinlei 101:dbcd3bc51758 46 return l;
xinlei 101:dbcd3bc51758 47 }