您好。我在烹饪黑客中使用这个例子来对我的服务器进行HTTP GET调用。（页面底部）
http://www.cooking-hacks.com/documentation/tutorials/arduino-3g-gprs-gsm-gps
我的最终目标是从php页面获取一个单词到我的Arduino Uno。
但是我遇到了问题，因为我的Arduino缓冲区有限，标头大小比缓冲区大。
因此，我的代码无效。我想只得到12但不知道该怎么做我希望有人可以帮我指出正确的方向。
* Description: This example shows how to do a GET method. So the buffer of
* is limited, we recommend to use the GET method with short answer for the
* requested webs.
* This example shows the AT commands (and the answers of the module) used
* to work with HTTP. For more information about the AT commands,
* refer to the AT command manual.
*
* Copyright (C) 2013 Libelium Comunicaciones Distribuidas S.L.
* http://www.libelium.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Version 0.2
* Author: Alejandro Gallego
*/
int8_t answer;
int onModulePin = 2, aux;
int data_size = 0;
int end_file = 0;
char aux_str[100];
char data[250];
int x = 0;
long previous;
char url[ ]="rubenvandijk.com";
int port= 80;
char request[ ]="GET /misc/twittertest5/get_tweet.php HTTP/1.1\r\nHost: rubenvandijk.com\r\n";
void setup(){
pinMode(onModulePin, OUTPUT);
Serial.begin(115200);
Serial.println("Starting...");
power_on();
delay(3000);
// sets the PIN code
sendATcommand("AT+CPIN=0000", "OK", 2000);
delay(3000);
while( (sendATcommand("AT+CREG?", "+CREG: 0,1", 500) ||
sendATcommand("AT+CREG?", "+CREG: 0,5", 500)) == 0 );
// sets APN, user name and password
sendATcommand("AT+CGSOCKCONT=1,\"IP\",\"prepaidinternet\"", "OK", 2000);
sendATcommand("AT+CSOCKAUTH=1,1,\"\",\"\"", "OK", 2000);
}
void loop(){
// request the url
sprintf(aux_str, "AT+CHTTPACT=\"%s\",%d", url, port);
answer = sendATcommand(aux_str, "+CHTTPACT: REQUEST", 60000);
if (answer == 1)
{
Serial.println(request);
//Serial.println(host);
//Serial.println("Content-Length: 0");
// Sends <Ctrl+Z>
aux_str[0] = 0x1A;
aux_str[1] = 0x00;
answer = sendATcommand(aux_str, "+CHTTPACT: DATA,", 60000);
x=0;
do{
if (answer == 1)
{
data_size = 0;
while(Serial.available()==0);
aux = Serial.read();
do{
data_size *= 10;
data_size += (aux-0x30);
while(Serial.available()==0);
aux = Serial.read();
}
while(aux != 0x0D);
Serial.print("Data received: ");
Serial.println(data_size);
if (data_size > 0)
{
while(Serial.available() < data_size);
Serial.read();
for (int y = 0; y < data_size; y++)
{
data[x] = Serial.read();
x++;
}
data[x] = '\0';
}
else
{
Serial.println("Download finished");
}
}
else
{
Serial.println("Error getting the url");
data_size = 0;
}
answer = sendATcommand2("", "+CHTTPACT: DATA,", "+CHTTPACT:0", 20000);
}while (answer != 1);
if (answer == 2)
{
Serial.print("Data received hallo:");
Serial.println(data);
}
else
{
Serial.println("Error getting data");
}
}
else
{
Serial.println("Error waiting the request");
}
delay(10000);
}
void power_on(){
uint8_t answer=0;
// checks if the module is started
answer = sendATcommand("AT", "OK", 2000);
if (answer == 0)
{
// power on pulse
digitalWrite(onModulePin,HIGH);
delay(3000);
digitalWrite(onModulePin,LOW);
// waits for an answer from the module
while(answer == 0){
// Send AT every two seconds and wait for the answer
answer = sendATcommand("AT", "OK", 2000);
}
}
}
int8_t sendATcommand(char* ATcommand, char* expected_answer1,
unsigned int timeout)
{
uint8_t x=0, answer=0;
char response[100];
unsigned long previous;
memset(response, '\0', 100); // Initialize the string
delay(100);
while( Serial.available() > 0) Serial.read(); // Clean the input buffer
Serial.println(ATcommand); // Send the AT command
x = 0;
previous = millis();
// this loop waits for the answer
do{
if(Serial.available() != 0){
response[x] = Serial.read();
x++;
// check if the desired answer is in the response of the module
if (strstr(response, expected_answer1) != NULL)
{
answer = 1;
}
}
// Waits for the asnwer with time out
}
while((answer == 0) && ((millis() - previous) < timeout));
return answer;
}
int8_t sendATcommand2(char* ATcommand, char* expected_answer1,
char* expected_answer2, unsigned int timeout)
{
uint8_t x=0, answer=0;
char response[100];
unsigned long previous;
memset(response, '\0', 100); // Initialize the string
delay(100);
while( Serial.available() > 0) Serial.read(); // Clean the input buffer
Serial.println(ATcommand); // Send the AT command
x = 0;
previous = millis();
// this loop waits for the answer
do{
if(Serial.available() != 0){
response[x] = Serial.read();
x++;
// check if the desired answer is in the response of the module
if (strstr(response, expected_answer1) != NULL)
{
answer = 1;
}
// check if the desired answer is in the response of the module
if (strstr(response, expected_answer2) != NULL)
{
answer = 2;
}
}
// Waits for the asnwer with time out
}
while((answer == 0) && ((millis() - previous) < timeout));
return answer;
}
现在返回
�Starting...
AT
AT+CPIN=0000
AT+CREG?
AT+CGSOCKCONT=1,"IP","prepaidinternet"
AT+CSOCKAUTH=1,1,"",""
AT+CHTTPACT="rubenvandijk.com",80
GET /misc/twittertest5/get_tweet.php HTTP/1.1
Host: rubenvandijk.com
Data received: 524
它被困在
if (data_size > 0)
{
while(Serial.available() < data_size);
Serial.read();
答案 0 :(得分：0)
我有几个想法可以试试......
1）一次处理一行输入数据，不要将其全部缓冲到处理中。 2）在Web服务器响应中添加一些特殊字符，抛出所有数据，直到看到该字符或序列。比如在你想要的数据前添加一个＃符号，因为字节只会在＃之后缓冲。 3）使用循环缓冲区让它覆盖直到收到所有数据，留下缓冲区中的最后X个字节，从缓冲区尾部向后处理。
1号是最好的答案，2号是最简单的。