Testing the FONA shield

Now that our hardware is ready, we are going to test the FONA shield to see whether it is correctly connected and can connect to the network. As a test, we will send an SMS to the shield and also read all the messages present in the SIM card.

This is the complete Arduino sketch for this part, minus some helper functions that won't be detailed here:

// Include library
#include "Adafruit_FONA.h"
#include <SoftwareSerial.h>

// Pins
#define FONA_RX 2
#define FONA_TX 3
#define FONA_RST 4

// Buffer for replies
char replybuffer[255];

// Software serial
SoftwareSerial fonaSS = SoftwareSerial(FONA_TX, FONA_RX);
SoftwareSerial *fonaSerial = &fonaSS;

// Fona
Adafruit_FONA fona = Adafruit_FONA(FONA_RST);

// Readline function
uint8_t readline(char *buff, uint8_t maxbuff, uint16_t timeout = 0);

void setup() {

  // Start Serial
  while (!Serial);
  Serial.begin(115200);
  Serial.println(F("FONA basic test"));
  Serial.println(F("Initializing....(May take 3 seconds...