File content as of revision 2:8de680cf7a19:

#include "Adafruit_FONA.h"
#include "WakeUp.h"
#include "mbed.h"

#define FONA_TX D8
#define FONA_RX D2
#define FONA_RST D3
#define FONA_RI D4
#define FONA_KEY D5

Adafruit_FONA fona(FONA_TX, FONA_RX, FONA_RST, FONA_RI);
Serial pcSerial(USBTX, USBRX);
DigitalOut key(FONA_KEY);

void changeGSMPowerState()
{
    key.write(0);
    wait(2);
    key.write(1);
}

void enterSleep(int msec){
    if(msec > 0) WakeUp::set_ms(msec);
    deepsleep();
}
    

int main()
{
    printf("Deep sleep test\n");
    // Enters deep sleep indefinitely
    enterSleep(0);
    printf("Exiting\n");
    
    pcSerial.baud(9600);
    changeGSMPowerState();
    printf("Starting FONA\n");
    while(!fona.begin(9600)) {
        printf("Cannot find FONA\n");
        wait(1);
    }
    fona.begin(9600);
    pcSerial.printf("On for 2 seconds\n");
    wait(2);
    pcSerial.printf("Turning off\n");
    changeGSMPowerState();

    return 0;
}