使用POST方法从Arduino发送数据到PHP

Question

我正在尝试将一些数据发送到服务器。当我单独使用此代码时，正常工作。但是当我将其他程序代码添加到Arduino时;变量postRequest没有得到正确的值（如图所示）。

正确的结果 当我添加其他程序代码时，结果如下： 数据不正确

arduino代码：

发送数据的功能：

boolean httpPOST(String data, String server, int port, String uri, String* response) {
    // initiate TCP connection
    String tcpStart = "AT+CIPSTART=0,\"TCP\",\"" + server + "\"," + port;
    Serial.println(tcpStart);
    // prepare the data to be posted
    String postRequest =
        "POST " + uri + " HTTP/1.1\r\n" +
        "Host: " + server + ":" + port + "\r\n" +
        "Accept: *" + "/" + "*\r\n" +
        "Content-Length: " + data.length() + "\r\n" +
        "Content-Type: application/x-www-form-urlencoded\r\n" 
        "\r\n" +
        "record=123456789876543212345678765";

    // notify ESP8266 about the lenght of TCP packet
    String sendCmd = "AT+CIPSEND=0," + postRequest.length();

    esp8266.println(tcpStart);
    if (esp8266.find("OK")) {
        Serial.println("TCP connection OK");
         Serial.println(postRequest);
        Serial.println(postRequest.length());
        jj=1;

        esp8266.print("AT+CIPSEND=0,");
        esp8266.println(postRequest.length());
        delay(500);
        if (esp8266.find(">")) {

            Serial.println("Sending packet...");

            esp8266.println(postRequest);
            if (esp8266.find("SEND OK")) {
                Serial.println("Packet sent");
                while (esp8266.available()) {
                    String tmpResp = esp8266.readString();
                    response = &tmpResp;
                }
                // close the connection
                esp8266.println("AT+CIPCLOSE=0");
                Serial.println("close");
                return true;
            }
            else {
                Serial.println("An error occured while sending packet");
                return false;
            }
        }
        else {
            Serial.println("ESP8266 is not listening for incoming data");
            return false;
        }
    }
    else {
        Serial.println("Cannot initiate TCP connection");
        return false;
    }
}

在循环中调用的函数：

void loop(){
//some codes ..

if (check()) { //check function for checking connected esp8266 Module to arduino
        resetESP8266();
        if (connectWifi("apwifi", "password")) {
            delay(5000);
            String response="";
            boolean ok = httpPOST("record="+record, "192.168.1.109", 80, "/lab/include/reciv.php", &response);
            if (ok) {
                Serial.println(response);
            }
            else {
                Serial.println("Something went wrong while posting data");
            }
        }
       }
//some codes..
}