File content as of revision 1:c73a98da0e7a:

#include <jsonlite.h>
#include "M2XStreamClient.h"

#include "mbed.h"
#include "LM75B.h"  //I2C Temperature Sensor

#include "C027.h"
#include "MDM.h"

//----------------------------------------------------------------------
// You may need to configure these parameters

/** Set your secret SIM pin here "1234"
*/
#define SIMPIN      NULL

/** The APN of your network operator, sometimes it is "internet" 
    check your contract with the network operator
*/
#define APN         "gprs.swisscom.ch"

/** Set the user name for your APN, or NULL if not needed
*/
#define USERNAME    NULL

/** Set the password for your APN, or NULL if not needed
*/
#define PASSWORD    NULL 

C027 c027;

char feedId[] = "<feed id>"; // Feed you want to post to
char m2xKey[] = "<m2x api key>"; // Your M2X access key
char streamName[] = "<stream name>"; // Stream you want to post to

char name[] = "<location name>"; // Name of current location of datasource
double latitude = 33.007872;
double longitude = -96.751614; // You can also read those values from a GPS
double elevation = 697.00;

Client client;
M2XStreamClient m2xClient(&client, m2xKey);

LM75B tmp(SDA,SCL);         // I2C Temperature Sensor

void on_data_point_found(const char* at, const char* value, int index, void* context) {
  printf("Found a data point, index: %d\r\n", index);
  printf("At: %s Value: %s\r\n", at, value);
}

void on_location_found(const char* name,
                       double latitude,
                       double longitude,
                       double elevation,
                       const char* timestamp,
                       int index,
                       void* context) {
  printf("Found a location, index: %d\r\n", index);
  printf("Name: %s  Latitude: %lf  Longitude: %lf\r\n", name, latitude, longitude);
  printf("Elevation: %lf  Timestamp: %s\r\n", elevation, timestamp);
}

int main() {
  // turn on the supplies of the Modem and the GPS
  c027.mdmPower(true);
  printf("Modem Initialize\r\n");
  MDMSerial mdm;
  if (!mdm.connect(SIMPIN, APN,USERNAME,PASSWORD, true))
    return -1;

  char amb_temp[6];
  
  while (true) {
  
    // read temp
    sprintf(amb_temp, "%0.2f", tmp.read());
    
    // post temperature
    int response = m2xClient.post(feedId, streamName, amb_temp);
    printf("Post response code: %d\r\n", response);
    if (response == -1) while (true) ;
    
    // read temperature
    response = m2xClient.fetchValues(feedId, streamName, on_data_point_found, NULL);
    printf("Fetch response code: %d\r\n", response);
    if (response == -1) while (true) ;
    
    // update location
    response = m2xClient.updateLocation(feedId, name, latitude, longitude, elevation);
    printf("updateLocation response code: %d\r\n", response);
    if (response == -1) while (true) ;
    
    // read location
    response = m2xClient.readLocation(feedId, on_location_found, NULL);
    printf("readLocation response code: %d\r\n", response);
    if (response == -1) while (true) ;

    // wait 60 secs and then loop
    delay(60000);
  }

  mdm.disconnect();
  mdm.powerOff();
  c027.mdmPower(false);
  printf("Done\n");
}