Http post problem

Technical Subjects
1 
> void sendATCommand(const char *command, int delayTime) {
>   Serial.print("Sending: ");
>   Serial.println(command);
>   ec200u.println(command);
>   delay(delayTime);
>   Serial.println("Response:");
>   while (ec200u.available()) {
>     Serial.write(ec200u.read());
>   }
>   Serial.println("\n---------------------------\n");
> }
> 
> void setup() {
>   Serial.begin(115200);
>   ec200u.begin(115200, SERIAL_8N1, RXD2, TXD2);
>   delay(2000);
> 
>   sendATCommand("AT+QIACT?", 2000); // Check if the module is connected to the internet
>   
>   sendATCommand("AT+QHTTPURL=62,80", 2000); // Set URL length
>   delay(1000);
>   sendATCommand("URL", 2000); // Send URL
> 
>   sendATCommand("AT+QHTTPPOST=164,80,80", 2000); // Prepare for HTTP POST
>   delay(1000);
>   
>   String postData = "POST /api/v1/GR65NXZ5XGqiVE5e8CCC/telemetry HTTP/1.1\r\n";
>   postData += "Host: http://thingsboard.cloud\r\n";
>   postData += "Content-Type: application/json\r\n";
>   postData += "Accept: */*\r\n";
>   postData += "Content-Length: 16\r\n\r\n"; // Proper blank line before JSON data
>   postData += "{temperature:24}";
> 
>   Serial.println("Sending POST Data...");
>   Serial.println(postData); // Print POST data in Serial Monitor
>   
>   ec200u.print(postData);
>   delay(5000);
> 
>   Serial.println("Response:");
>   while (ec200u.available()) {
>     Serial.write(ec200u.read());
>   }
>   Serial.println("\n---------------------------\n");
> }
> 
> void loop() {
> }
> THIS IS MY CODE AND 
> 
> 
> AT+QIACT?
> 
> +QIACT: 1,1,1,"10.172.77.133"
> 
> OK
> 
> ---------------------------
> 
> Sending: AT+QHTTPURL=62,80
> 
> Response:
> 
> AT+QHTTPURL=62,80
> 
> CONNECT
> 
> ---------------------------
> 
> Sending: http://thingsboard.cloud/api/v1/GR65NXZ5XGqiVE5e8CCC/telemetry
> 
> Response:
> 
> OK
> 
> ---------------------------
> 
> Sending: AT+QHTTPPOST=164,80,80
> 
> Response:
> 
> AT+QHTTPPOST=164,80,80
> 
> CONNECT
> 
> ---------------------------
> 
> Sending POST Data...
> 
> POST /api/v1/GR65NXZ5XGqiVE5e8CCC/telemetry HTTP/1.1
> 
> Host: http://thingsboard.cloud
> 
> Content-Type: application/json
> 
> Accept: */*
> 
> Content-Length: 16
> 
> {temperature:24}
> 
> Response:
> 
> OK
> 
> +QHTTPPOST: 0,400
> 
> ---------------------------
2

pls add
AT+QHTTPCFG=“requestheader”,1

POST data such as

POST /api/v1/GR65NXZ5XGqiVE5e8CCC/telemetry HTTP/1.1
Host: http://thingsboard.cloud
Content-Type: application/json
Accept: /
Content-Length: 16
**you need to add \r\n
{temperature:24}

3 
#include <HardwareSerial.h>

#define RXD2 12  // EC200U RX pin connected to ESP32 TX
#define TXD2 13  // EC200U TX pin connected to ESP32 RX

HardwareSerial ec200u(2);

void sendATCommand(const char *command, int delayTime) {
  Serial.print("Sending: ");
  Serial.println(command);
  ec200u.println(command);
  delay(delayTime);
  Serial.println("Response:");
  while (ec200u.available()) {
    Serial.write(ec200u.read());
  }
  Serial.println("\n---------------------------\n");
}

void readResponse(int timeout) {
  long int time = millis();
  while ((millis() - time) < timeout) {
    while (ec200u.available()) {
      char c = ec200u.read();
      Serial.write(c);
    }
  }
  Serial.println("\n---------------------------\n");
}

void setup() {
  Serial.begin(115200);
  ec200u.begin(115200, SERIAL_8N1, RXD2, TXD2);
  delay(2000);

  sendATCommand("AT+QIACT?", 2000); // Check if the module is connected to the internet
  sendATCommand("AT+QHTTPCFG=\"requestheader\",1", 2000); // Enable request header
  
  sendATCommand("AT+QHTTPURL=62,80", 2000); // Set URL length
  delay(1000);
  sendATCommand("http://thingsboard.cloud/api/v1/GR65NXZ5XGqiVE5e8CCC/telemetry", 2000); // Send URL

  sendATCommand("AT+QHTTPPOST=167,80,80", 2000); // Prepare for HTTP POST
  delay(1000);
  
  String postData = "POST /api/v1/GR65NXZ5XGqiVE5e8CCC/telemetry HTTP/1.1\r\n";
  postData += "Host: http://thingsboard.cloud\r\n"; // Fixed host format
  postData += "Content-Type: application/json\r\n";
  postData += "Accept: /\r\n";
  postData += "Content-Length: 18\r\n\r\n"; // Proper blank line before JSON data
  postData += "{\"temperature\":24}";

  Serial.println("Sending POST Data...");
  Serial.println(postData); // Print post data to serial monitor
  ec200u.print(postData);
  delay(1000);
  ec200u.write(0x1A);  // Send Ctrl+Z to indicate end of data
  delay(5000);

  Serial.println("Response:");
  readResponse(5000); // Improved response reading
  
  // Read HTTP response
}

void loop() {
}

above is my program updated one and following is the result i started getting character length in response but still 400 error is their
can you please run if it’s working for you or not.
Sending: AT+QIACT?

Response:

AT+QIACT?

+QIACT: 1,1,1,“10.221.167.160”

OK

Sending: AT+QHTTPCFG=“requestheader”,1

Response:

AT+QHTTPCFG=“requestheader”,1

OK

Sending: AT+QHTTPURL=62,80

Response:

AT+QHTTPURL=62,80

CONNECT

Sending: http://thingsboard.cloud/api/v1/GR65NXZ5XGqiVE5e8CCC/telemetry

Response:

OK

Sending: AT+QHTTPPOST=167,80,80

Response:

AT+QHTTPPOST=167,80,80

CONNECT

Sending POST Data…

POST /api/v1/GR65NXZ5XGqiVE5e8CCC/telemetry HTTP/1.1
Host: http://thingsboard.cloud
Content-Type: application/json
Accept: /
Content-Length: 18

{"temperature":24}

Response:

OK

+QHTTPPOST: 0,400,435