static float
getTemperature (LPNXCTRLAPP pApp) {
static int nUpdate = -1;
static float fTemp = 0.0;
if (nUpdate < 0 || nUpdate > TEMP_UPDATE_COUNT) {
float fTmp = (getTMP36Value(pApp) + TMP36_DELTA - 0.5) * 100;
float fCPUTemp = getCPUTemp()/1000.0;
fCPUTemp = (fCPUTemp > 120) ? (fCPUTemp - 74) : fCPUTemp;
if (fCPUTemp < CPUTEMP_SSG)
fTmp -= (fCPUTemp > CPUTEMP_BASE) ? (fCPUTemp - CPUTEMP_BASE) : 0;
else {
float fD = (fCPUTemp > CPUTEMP_BASE) ?
(fCPUTemp - CPUTEMP_BASE + SSG_DELTA) : 0;
if (fD > TMP_MAX_DELTA) fD = TMP_MAX_DELTA;
fTmp -= fD;
}
CPUTEMP = fCPUTemp;
if (fTmp < -30 || fTmp > 50) fTmp = 0;
fTemp = fTmp;
nUpdate = 0;
} else
nUpdate++;
return fTemp;
}
int main(int argc, char **argv) {
InitDHT(1);
char* json;
int lckStatus;
int res;
int sleepTimeout;
struct config configstr;
char *passwd;
char *username;
char msproxyUrl[MAXBUF];
//setup the syslog logging
setlogmask(LOG_UPTO(LOGLEVEL));
openlog("iot", LOG_PID | LOG_CONS, LOG_USER);
syslog(LOG_INFO, "**** IoT Raspberry Pi Sample has started ****");
// register the signal handler for USR1-user defined signal 1
if (signal(SIGUSR1, sig_handler) == SIG_ERR)
syslog(LOG_CRIT, "Not able to register the signal handler\n");
if (signal(SIGINT, sig_handler) == SIG_ERR)
syslog(LOG_CRIT, "Not able to register the signal handler\n");
//read the config file, to decide whether to goto quickstart or registered mode of operation
isRegistered = get_config(configFile, &configstr);
if (isRegistered) {
syslog(LOG_INFO, "Running in Registered mode\n");
sprintf(msproxyUrl, "ssl://%s.messaging.internetofthings.ibmcloud.com:8883", configstr.org);
if(strcmp(configstr.authmethod ,"token") != 0) {
syslog(LOG_ERR, "Detected that auth-method is not token. Currently other authentication mechanisms are not supported, IoT process will exit.");
syslog(LOG_INFO, "**** IoT Raspberry Pi Sample has ended ****");
closelog();
exit(1);
} else {
username = "******";
passwd = configstr.authtoken;
}
} else {
syslog(LOG_INFO, "Running in Quickstart mode\n");
strcpy(msproxyUrl,"tcp://quickstart.messaging.internetofthings.ibmcloud.com:1883");
}
// read the events
char* mac_address = getmac("eth0");
getClientId(&configstr, mac_address);
//the timeout between the connection retry
int connDelayTimeout = 1; // default sleep for 1 sec
int retryAttempt = 0;
// initialize the MQTT connection
init_mqtt_connection(&client, msproxyUrl, isRegistered, clientId, username, passwd);
// Wait till we get a successful connection to IoT MQTT server
while (!MQTTAsync_isConnected(client)) {
connDelayTimeout = 1; // add extra delay(3,60,600) only when reconnecting
if (connected == -1) {
connDelayTimeout = reconnect_delay(++retryAttempt); //Try to reconnect after the retry delay
syslog(LOG_ERR,
"Failed connection attempt #%d. Will try to reconnect "
"in %d seconds\n", retryAttempt, connDelayTimeout);
connected = 0;
init_mqtt_connection(&client, msproxyUrl, isRegistered, clientId, username,
passwd);
}
fflush(stdout);
sleep(connDelayTimeout);
}
// resetting the counters
connDelayTimeout = 1;
retryAttempt = 0;
// count for the sine wave
int count = 1;
sleepTimeout = EVENTS_INTERVAL;
//subscribe for commands - only on registered mode
if (isRegistered) {
subscribe(&client, subscribeTopic);
}
while (1) {
JsonMessage json_message = { DEVICE_NAME, getCPUTemp(), sineVal(
MIN_VALUE, MAX_VALUE, 16, count), GetCPULoad() , getHumidity(), getTemp()};
json = generateJSON(json_message);
res = publishMQTTMessage(&client, publishTopic, json);
syslog(LOG_DEBUG, "Posted the message with result code = %d\n", res);
if (res == -3) {
//update the connected to connection failed
connected = -1;
while (!MQTTAsync_isConnected(client)) {
if (connected == -1) {
connDelayTimeout = reconnect_delay(++retryAttempt); //Try to reconnect after the retry delay
syslog(LOG_ERR, "Failed connection attempt #%d. "
"Will try to reconnect in %d "
"seconds\n", retryAttempt, connDelayTimeout);
sleep(connDelayTimeout);
connected = 0;
reconnect(&client, isRegistered, username,passwd);
}
fflush(stdout);
sleep(1);
}
// resetting the counters
connDelayTimeout = 1;
retryAttempt = 0;
}
fflush(stdout);
free(json);
count++;
sleep(sleepTimeout);
}
return 0;
}