是否可以使用以太网屏蔽与我的 Arduino Uno 接收 HTTP Post 请求。我想制作一个可以控制我的 Arduino 的 Android 应用程序，我认为最好的方法是使用 HTTP Post 请求。
有很多关于1 [Sending a POST Request] 的帖子，但我找不到任何关于如何接收 HTTP Post 请求的帖子。我刚开始为 Arduino 编程，但我已经为 Android 制作了一些应用程序（我已经完成了 Android 的邮政编码）。
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3 回答
8
我想像你一样阅读 POST 而不是使用 GET。我是这样做的：
/*
A simple Arduino Ethernet web server.
by John Harrison
*/
#include <SPI.h>
#include <Ethernet.h>
// You can change the MAC and IP addresses to suit your network:
byte mac[] = { 0X52, 0X64, 0X75, 0X69, 0X6E, 0X6F };
IPAddress ip( 192,168,0,97 );
EthernetServer server(80); // Port 80 is HTTP port
char new_state[1024];
void setup()
{
Serial.begin(9600);
// Start the Ethernet server:
Ethernet.begin(mac, ip);
server.begin();
// Set the digital pins ready to write to
for (int pin = 2; pin <= 9; pin++) {
pinMode(pin, OUTPUT);
}
Serial.print("Serving on http://");
Serial.println(Ethernet.localIP());
}
void loop()
{
// listen for incoming clients
EthernetClient client = server.available();
if (client) {
// Serial.println("Client connected");
while (client.connected()) {
int i = 0;
int head = 1;
int body = 0;
while(client.available()) {
char c = client.read();
if (c == '\n') {
if ( i <= 2 ) {
// an http request ends with a blank line
sendPage(client);
if ( head == 1 ) {
body = 1;
head = 0;
}
}
i = -1;
}
if ( body == 1 ) {
new_state[i] = c;
}
i++;
new_state[i] = '\0';
}
i = 0;
}
// Serial.println("Disconnected");
/*
if ( strlen(new_state) > 0 ){
Serial.print ("[");
Serial.print(new_state);
Serial.println ("]");
}
*/
// Post data looks like pinD2=On
if ( strncmp( new_state, "pinD", 4) == 0 ) {
int pin = new_state[4] - 48; // Convert ascii to int
// Serial.println(pin);
if ( strncmp( new_state+5, "=On", 3) == 0 ) {
digitalWrite(pin, 1);
}
else if ( strncmp( new_state+5, "=Off", 4) == 0 ) {
digitalWrite(pin, 0);
}
}
}
}
void sendPage(EthernetClient client)
{
// Serial.println("Sending response");
// send a standard http response header
client.println("HTTP/1.0 200 OK\Content-Type: text/html\n\n<html>\n<head>");
client.println("<link rel='icon' href='data:;base64,iVBORw0KGgo='>");
client.println("<title>POST Pin controller</title>\n</head>\n<body>\n");
client.println("<h2>Buttons turn pins on or off</h2>");
client.println("<form method='post' action='/' name='pins'>");
char line[1024];
int pin;
for ( pin=2; pin<=9; pin++ ) {
sprintf(line, "<input name='pinD%d' type='submit' value='On' />\n", pin);
client.print(line);
sprintf(line, "<input name='pinD%d' type='submit' value='Off' /> %d<br />\n", pin, pin);
client.print(line);
}
client.println("</form>\n</body>\n</html>");
client.stop();
}
有一些方法可以做到更简单、更小，但我发现它们相当滞后，所以一直在努力尽快得到它。
我用它来控制 Mega 2560 上引脚 2-9 上的 8 个 LED。我还没有在 Uno 上测试过它，但我希望它可以工作。
于 2014-11-23T03:38:43.670 回答
7
不确定 POST，但 GET 肯定有效。这是我一直在使用的 AJAX 示例。它只是控制一个RGB LED。
xmlhttp.open("GET", "http://ipAddressOfArduino?r=" + redVal + "&g=" + greenVal + "&b=" + blueVal + "&e", true);
然后在 Arduino 方面，我只是解析数据。
//ARDUINO 1.0+ ONLY
//ARDUINO 1.0+ ONLY
#include <Ethernet.h>
#include <SPI.h>
boolean reading = false;
String myStr;
int redVal, greenVal, blueVal;
////////////////////////////////////////////////////////////////////////
//CONFIGURE
////////////////////////////////////////////////////////////////////////
//byte ip[] = { 192, 168, 0, 1 }; //Manual setup only
//byte gateway[] = { 192, 168, 0, 1 }; //Manual setup only
//byte subnet[] = { 255, 255, 255, 0 }; //Manual setup only
// if need to change the MAC address (Very Rare)
byte mac[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
EthernetServer server = EthernetServer(80); //port 80
////////////////////////////////////////////////////////////////////////
void setup(){
Serial.begin(9600);
pinMode(3, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
Ethernet.begin(mac);
//Ethernet.begin(mac, ip); //for manual setup
server.begin();
Serial.println(Ethernet.localIP());
}
void loop(){
// listen for incoming clients, and process qequest.
checkForClient();
}
void checkForClient(){
EthernetClient client = server.available();
if (client) {
// an http request ends with a blank line
boolean currentLineIsBlank = true;
boolean sentHeader = false;
myStr = "";
while (client.connected()) {
if (client.available()) {
char c = client.read();
if(reading && c == ' ') reading = false;
if(c == '?') reading = true; //found the ?, begin reading the info
if(reading){
//Serial.print(c);
if (c!='?') {
myStr += c;
}
}
if (c == '\n' && currentLineIsBlank) break;
if (c == '\n') {
currentLineIsBlank = true;
}else if (c != '\r') {
currentLineIsBlank = false;
}
}
}
parseThangs(myStr);
analogWrite(3, redVal);
analogWrite(5, greenVal);
analogWrite(6, blueVal);
delay(100); // give the web browser time to receive the data
client.stop(); // close the connection:
}
}
void parseThangs(String str) {
int startIndex = str.indexOf("r");
int endIndex = str.indexOf("g");
String redStr = str.substring(startIndex + 2, endIndex - 1);
char tempRed[4];
redStr.toCharArray(tempRed, sizeof(tempRed));
redVal = atoi(tempRed);
startIndex = str.indexOf("g");
endIndex = str.indexOf("b");
String greenStr = str.substring(startIndex + 2, endIndex -1);
char tempGreen[4];
greenStr.toCharArray(tempGreen, sizeof(tempGreen));
greenVal = atoi(tempGreen);
startIndex = str.indexOf("b");
endIndex = str.indexOf("e");
String blueStr = str.substring(startIndex + 2, endIndex -1);
char tempBlue[4];
blueStr.toCharArray(tempBlue, sizeof(tempBlue));
blueVal = atoi(tempBlue);
Serial.println(redStr + " " + greenStr + " " + blueStr);
}
可能有点草率，但它确实有效。
于 2013-02-21T21:31:57.290 回答
5
一个 POST 看起来像：
POST /test.php HTTP/1.1
Host: 192.168.0.55
Content-Type: application/x-www-form-urlencoded
Connection: close
User-Agent: Arduino/1.0
Content-Length: 1024
data=5
所以你必须忽略第一个“换行符”并继续阅读。这是我修改后的 Web 服务器代码，用于读取发布的数据：
/*
Web Server
*/
#include <SPI.h>
#include <Ethernet.h>
// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {
0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
};
IPAddress ip(192, 168, 15, 177);
// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(80);
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
// start the Ethernet connection and the server:
//Ethernet.begin(mac, ip);
Ethernet.begin(mac);
server.begin();
Serial.print("server is at ");
Serial.println(Ethernet.localIP());
}
void writeResponse(EthernetClient client) {
// send a standard http response header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connection: close"); // the connection will be closed after completion of the response
// client.println("Refresh: 5"); // refresh the page automatically every 5 sec
client.println();
client.println("<!DOCTYPE HTML>");
client.println("<html> <body>");
// output the value of each analog input pin
for (int analogChannel = 0; analogChannel < 6; analogChannel++) {
int sensorReading = analogRead(analogChannel);
client.print("analog input ");
client.print(analogChannel);
client.print(" is ");
client.print(sensorReading);
client.println("<br />");
}
client.println("<form action=\"\" method=\"post\">");
client.println("<input type=\"submit\" value=\"On\" name=\"btnOn\">");
client.println("<input type=\"submit\" value=\"Off\" name=\"btnOff\">");
client.println("</form>");
client.println("</body> </html>");
}
void loop() {
// listen for incoming clients
EthernetClient client = server.available();
if (client) {
Serial.print("new client [");
//Serial.print(client.getRemoteIP());
//Serial.println("]");
// an http request ends with a blank line
boolean currentLineIsBlank = true;
String req_str = "";
int data_length = -1;
boolean skip = true;
//int empty_line_count = 0;
while (client.connected())
{
if (client.available()) {
char c = client.read();
//Serial.write(c);
req_str += c;
// if you've gotten to the end of the line (received a newline
// character) and the line is blank, the http request has ended,
// so you can send a reply
if (c == '\n' && currentLineIsBlank && req_str.startsWith("GET")) {
writeResponse(client);
break;
}
if (c == '\n' && currentLineIsBlank && req_str.startsWith("POST") && !skip) {
writeResponse(client);
break;
}
if (c == '\n' && currentLineIsBlank && req_str.startsWith("POST") && skip) {
skip = false;
String temp = req_str.substring(req_str.indexOf("Content-Length:") + 15);
temp.trim();
//Serial.print("Content-Length=");
data_length = temp.toInt();
/*Serial.println(data_length);
writeResponse(client);
break;*/
while(data_length-- > 0)
{
c = client.read();
req_str += c;
}
writeResponse(client);
break;
}
if (c == '\n') {
// you're starting a new line
currentLineIsBlank = true;
} else if (c != '\r') {
// you've gotten a character on the current line
currentLineIsBlank = false;
}
}
}
Serial.println(req_str);
// give the web browser time to receive the data
delay(1);
// close the connection:
client.stop();
Serial.println("client disconnected");
}
}
于 2016-04-26T12:39:34.857 回答