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
measurement/Signal.cpp
- Committer:
- xinlei
- Date:
- 2015-05-20
- Revision:
- 118:e831cdb799ab
- Parent:
- 101:dbcd3bc51758
- Child:
- 123:3e4a1ed4bad5
File content as of revision 118:e831cdb799ab:
#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; } } 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; }