New SIM800 library aimed at HTTP communication & GSM location

After some efforts, I managed to make it work with an Arduino Leonardo. Basically 5 wires are needed to connect the module to Arduino and they connect pins of VCC/GND/Rx/Tx/Reset. This is quite straight-forward.

My target is continuously sending HTTP requests containing sensor data to a web server (data as URL argument) and retrieve the response containing command. To make it easier for myself and other people who use the same SIM800 based modules, I started to write an Arduino library for this purpose. It contains only what I need at the moment. That includes what is needed to perform HTTP request and retrieving GSM location data. I am expanding it graudually over the next a few weeks. The library is hosted on GitHub and an exmple sketch is also available. The sketch can be as simple as following.

#include "SIM800.h"

#define APN "connect"
#define con Serial
static const char* url = "http://arduinodev.com/datetime.php";

CGPRS_SIM800 gprs;

void setup()
{
con.begin(9600);
while (!con);

for (;;) {
con.print("Resetting...");
while (!gprs.init());
con.println("OK");

con.print("Setting up network...");
byte ret = gprs.setup(APN);
if (ret == 0)
break;
con.print("Error code:");
con.println(ret);
}
con.println("OK");

for (;;) {
if (gprs.httpInit()) break;
con.println(gprs.buffer);
gprs.httpUninit();
delay(1000);
}
}

void loop()
{
gprs.httpConnect(url);
while (gprs.httpIsConnected() == 0) {
// can do something here while waiting
}
if (gprs.httpState == HTTP_ERROR) {
con.println("Connect error");
return;
}
con.println();
gprs.httpRead();
int ret;
while ((ret = gprs.httpIsRead()) == 0) {
// can do something here while waiting
}
if (gprs.httpState == HTTP_ERROR) {
con.println("Read error");
return;
}

// now we have received payload
con.print("[Payload]");
con.println(gprs.buffer);

// show position
GSM_LOCATION loc;
if (gprs.getLocation(&loc)) {
con.print("LAT:");
con.print(loc.lat, 6);
con.print(" LON:");
con.print(loc.lon, 6);
con.print(" TIME:");
con.print(loc.hour);
con.print(':');
con.print(loc.minute);
con.print(':');
con.println(loc.second);
}
}

See here for updates about this library