Arduino MKRNB - connected()用法及代码示例

client.connected()

/*
  Web client

 This sketch connects to a website through a MKR NB 1500. Specifically,
 this example downloads the URL "http://arduino.cc/" and prints it
 to the Serial monitor.

 Circuit:
 * MKR NB 1500
 * SIM card with a data plan

 created 8 Mar 2012
 by Tom Igoe

 http://arduino.cc/en/Tutorial/NBExamplesWebClient

 */

// libraries
#include <MKRNB.h>

// PIN Number
#define PINNUMBER ""

// initialize the library instance
NBClient client;
GPRS gprs;
NB nbAccess;

// URL, path & port (for example: arduino.cc)
char server[] = "arduino.cc";
char path[] = "/";
int port = 80; // port 80 is the default for HTTP

void setup()
{
  // initialize serial communications
  Serial.begin(9600);
  Serial.println("Starting Arduino web client.");
  // connection state
  boolean notConnected = true;

  // After starting the modem with NB.begin()
  // attach the shield to the GPRS network with the APN, login and password
  while(notConnected)
  {
      if((nbAccess.begin(PINNUMBER)==NB_READY) &&
       (gprs.attachGPRS()==GPRS_READY))
     notConnected = false;
    else
    {
      Serial.println("Not connected");
      delay(1000);
    }
  }

  Serial.println("connecting...");

  // if you get a connection, report back via serial:
  if (client.connect(server, port))
  {
    Serial.println("connected");
    // Make a HTTP request:
    client.print("GET ");
    client.print(path);
    client.println(" HTTP/1.0");
    client.println();
  }
  else
  {
    // if you didn't get a connection to the server:
    Serial.println("connection failed");
  }
}

void loop()
{
  // if there are incoming bytes available
  // from the server, read them and print them:
  if (client.available())
  {
    char c = client.read();
    Serial.print(c);
  }

  // if the server's disconnected, stop the client:
  if (!client.available() && !client.connected())
  {
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();

    // do nothing forevermore:
    for(;;)
      ;
  }
}