I have an Arduino UNO and sim808 EVB-V3.02.4. I want to send a GET request to my url but I always receive 400 Http bad request error.
#include <DFRobot_sim808.h>
#include <SoftwareSerial.h>
#define PIN_TX 7
#define PIN_RX 8
SoftwareSerial mySerial(PIN_TX,PIN_RX);
DFRobot_SIM808 sim808(&mySerial);//Connect RX,TX,PWR,
char http_cmd[] = "GET /index.php?lat=10&long=100 HTTP/1.0\r\n\r\n";
char buffer[512];
void setup() {
mySerial.begin(9600);
Serial.begin(9600);
}
void loop() {
//*********** Attempt DHCP *******************
while(!sim808.join(F("cmnet"))) {
Serial.println("Sim808 join network error");
delay(2000);
}
//************ Successful DHCP ****************
Serial.print("IP Address is ");
Serial.println(sim808.getIPAddress());
//*********** Establish a TCP connection ************
while(!sim808.connect(TCP,"39c309ae.ngrok.io", 80)) {
Serial.println("Connect error");
}
Serial.println("Connection success");
//*********** Send a GET request *****************
Serial.println("waiting to fetch...");
sim808.send(http_cmd, sizeof(http_cmd)-1);
while (true) {
int ret = sim808.recv(buffer, sizeof(buffer)-1);
if (ret <= 0){
Serial.println("fetch over...");
break;
}
buffer[ret] = '0円';
Serial.print("Recv: ");
Serial.print(ret);
Serial.print(" bytes: ");
Serial.println(buffer);
break;
}
//************* Close TCP or UDP connections **********
sim808.close();
//*** Disconnect wireless connection, Close Moving Scene *******
sim808.disconnect();
delay(5000);
}
My php code:
<?php
file_put_contents('test.txt', $_GET['lat'] . '---' . $_GET['lon']);
print '
<html>
<head>
<title>Good</title>
</head>
<body>
Was Good
</body>
</html>
';
?>
I want just open http://39c309ae.ngrok.io/index.php?lat=10&long=100 with arduino and sim808.
What is wrong in my codes?
asked Sep 2, 2019 at 13:55
1 Answer 1
You aren't sending the Host: header with your request. Without that the web server has no idea which website you want to get the /index.php page from.
char http_cmd[] = "GET /index.php?lat=10&long=100 HTTP/1.0\r\n"
"Host: 39c309ae.ngrok.io\r\n"
"\r\n";
answered Sep 2, 2019 at 13:59
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nice worked! thanks a lot! becuse of low mine low reputation i can not flag your question for best answer! anyway , thanksPooya Behravesh– Pooya Behravesh2019年09月02日 14:06:10 +00:00Commented Sep 2, 2019 at 14:06
lang-cpp