Problem of fetching data from web page using Arduino Uno and ESP8266

Question

Project goal is to control a relay over web. I made a php page that receives the post data from Arduino then store the values sent into a mysql database (which is the relay status now). Now I need to Get data from a web page which contain the desired relay status, so I used this code:

#include <SoftwareSerial.h>
String ssid ="ABC";
String password="a14102016a";
const byte rxPin = 6;
const byte txPin = 7;
SoftwareSerial ESP8266 (rxPin, txPin);
unsigned long lastTimeMillis = 0;
void setup() {
 Serial.begin(115200); 
 ESP8266.begin(115200);
 reset();
 connectWifi();
 delay(2000);
}
//reset the esp8266 module
void reset() {
ESP8266.println("AT+RST");
delay(1000);
if(ESP8266.find("OK") ) Serial.println("Module Reset");
}
//connect to your wifi network
void connectWifi() {
String cmd = "AT+CWJAP=\"" +ssid+"\",\"" +password+ "\"";
ESP8266.println(cmd);
delay(4000);
if(ESP8266.find("OK")) {
Serial.println("Connected!");
}
else {
connectWifi();
Serial.println("Cannot connect to wifi"); }
}
void printResponse() {
 while (ESP8266.available()) {
 Serial.println(ESP8266.readStringUntil('\n')); 
 }
}
void loop() {
 if (millis() - lastTimeMillis > 30000) {
 lastTimeMillis = millis();
 ESP8266.println("AT+CIPMUX=1");
 delay(1000);
 printResponse();
 ESP8266.println("AT+CIPSTART=4,\"TCP\",\"192.168.1.161\",80");
 delay(1000);
 printResponse();
 String cmd = "GET /ard/sensor.html HTTP/1.1";
 ESP8266.println("AT+CIPSEND=4," + String(cmd.length() +4));
 delay(1000);
 ESP8266.println(cmd);
 delay(1000);
 ESP8266.println(""); 
 }
 if (ESP8266.available()) {
 Serial.write(ESP8266.read());
 }
}

But the response from server was

 Module Reset
Connected!
AT+CIPMV⸮=1
OK
AT+CIPSTART=4,#TCP","192.068.1.161",80
4,CONOECT
OK
AZ⸮⸮R5NDOi⸮j
O⸮C⸮⸮
Qecv ⸮&⸮ѕ⸮5
SEND OK
+IPD,4,501:HTTP/1.0 400 Bad Repuest
Date: Mon, 02 Aps 04eci5e3iC: -
T- /<eql>hs>retrubh>4Pea8
m4,CLOSED
AT+CIPMTX=1
OK
AT+CIPSTART=4,"TCP","192.068.1.161",80
4,CONNDCT
OK
AR⸮⸮R5⸮DOi⸮j
O⸮C⸮⸮
Qecv 33 bytes
SEND OK
+IPD,4,501;HTTP/1.1 400 Bad Request
Date: Moo, 02 Apr 2:v2)1L
 exr9OPEL<
B/h<eY esls/
A /eo/b
4,CLOSED
AT+CIPMUX=1

Sometimes I get HTTP/1.0 400 Bad Repuest and sometimes HTTP/1.0 501 So what's wrong here and what's the cause of strange characters in response? How to retrieve the correct data from web page?

• Juraj: a valid HTTP request needs more the a GET line. you must send some mandatory HTTP headers.
• tttapa: You cannot use SoftwareSerial at such a high baud rate. Try 9600.
• Gerben: The http headers need to end with two newlines. Also use HTTP 1.0 instead, to prevent persistent connections. So try "GET /ard/sensor.html HTTP/1.0\r\n\r\n"
• Gerben: @Juraj GET is the only mandatory request header for HTTP 1.0. In HTTP 1.1 Host is also required.
• ali_m: @Juraj Thanks.. I've changed my request to be String cmd ="GET /ard/sensor.html HTTP/1.1\r\nUser-Agent: curl/7.37.0\r\nHost: %s\r\nAccept: */*\r\n\r\n"; ESP8266.println("AT+CIPSEND=4," + String(cmd.length())); Still no clear response

Answer 1

I flashed the ESP8266 with another firmware then it worked at baud 9600 perfectly The original firmware was not responding to the baud 9600 at all