Arduino

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GSM : GSM class

## begin()

#### Description

Connects to the GSM network identified on the SIM card.

#### Syntax

gsm.begin()
gsm.begin(pin)
gsm.begin(pin, restart)
gsm.begin(pin, restart, sync)

#### Parameters

- pin : character array with the PIN to access a SIM card (default = 0)
- restart : boolean, determines whether to restart modem or not (default= true)
- sync : boolean, synchronous (true, default) or asynchronous (false) mode

#### Returns

char : 0 if asynchronous. If synchronous, returns status : ERROR, IDLE, CONNECTING, GSM_READY, GPRS_READY, TRANSPARENT_CONNECTED

#### Example

#include <GSM.h>
#define PINNUMBER ""
GSM gsm; // include a 'true' parameter for debug enabled
void setup()
{
// initialize serial communications
Serial.begin(9600);
// connection state
boolean notConnected = true;
// Start GSM shield
// If your SIM has PIN, pass it as a parameter of begin() in quotes
while(notConnected)
{
if(gsm.begin(PINNUMBER)==GSM_READY)
notConnected = false;
else
{
Serial.println("Not connected");
delay(1000);
}
}
Serial.println("GSM initialized");
}
void loop()
{
// once connected do something interesting
}
[Get Code]

#### See Also

- GSM constructor
- shutdown()

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Corrections, suggestions, and new documentation should be posted to the Forum.

The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.

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