如何在AP模式下更改参数？

我在 github 上使用来自 tzapu 的 wifimanager，示例是 FSparameters。它允许您在将 esp 作为客户端运行之前在 AP 模式下更改参数。
我还连接了一个 HDC1080 温度/湿度传感器并打印出大量数据。我有一个 LED 在湿度 >= 50 或温度 >= 30 时触发；（摄氏度）效果很好。
然后我为 Humid >= mqtt_port; 编写了一个触发点；花了一些时间摆弄像 [3] 这样的尺寸，它终于奏效了！所以然后我尝试了它的温度但它没有用。
当我将该功能带回湿度时，无论我将其设置为什么，现在它所做的只是触发 48。如果我将字符大小设置为较小 [2]，那么它会在 46 时触发。这些数字从何而来？
AP 用户/通行证：WatchDog/esptest
我如何使用 char 之后的大小？请在下面的代码中查看。感谢您的观看：
代码：全选#include                    //this needs to be first, or it all crashes and burns...

#include           //https://github.com/esp8266/Arduino

//needed for library
#include
#include
#include           //https://github.com/tzapu/WiFiManager

#include           //https://github.com/bblanchon/ArduinoJson

#include
#include "ClosedCube_HDC1080.h"

#define LED 15
ClosedCube_HDC1080 hdc1080;

//define your default values here, if there are different values in config.json, they are overwritten.
char mqtt_server[40];
char mqtt_port[3] = "65";
char blynk_token[34] = "YOUR_BLYNK_TOKEN";

//flag for saving data
bool shouldSaveConfig = false;

//callback notifying us of the need to save config
void saveConfigCallback () {
  Serial.println("Should save config");
  shouldSaveConfig = true;
}


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println();

  //clean FS, for testing
  //SPIFFS.format();
pinMode(LED, OUTPUT);
  //read configuration from FS json
  Serial.println("mounting FS...");

  if (SPIFFS.begin()) {
    Serial.println("mounted file system");
    if (SPIFFS.exists("/config.json")) {
      //file exists, reading and loading
      Serial.println("reading config file");
      File configFile = SPIFFS.open("/config.json", "r");
      if (configFile) {
        Serial.println("opened config file");
        size_t size = configFile.size();
        // Allocate a buffer to store contents of the file.
        std::unique_ptr buf(new char[size]);

        configFile.readBytes(buf.get(), size);
        DynamicJsonBuffer jsonBuffer;
        JsonObject& json = jsonBuffer.parseObject(buf.get());
        json.printTo(Serial);
        if (json.success()) {
          Serial.println("\nparsed json");

          strcpy(mqtt_server, json["mqtt_server"]);
          strcpy(mqtt_port, json["mqtt_port"]);
          strcpy(blynk_token, json["blynk_token"]);

        } else {
          Serial.println("failed to load json config");
        }
      }
    }
  } else {
    Serial.println("failed to mount FS");
  }
  //end read



  // The extra parameters to be configured (can be either global or just in the setup)
  // After connecting, parameter.getValue() will get you the configured value
  // id/name placeholder/prompt default length
  WiFiManagerParameter custom_mqtt_server("server", "mqtt server", mqtt_server, 30);
  WiFiManagerParameter custom_mqtt_port("port", "mqtt port", mqtt_port, 5);
  WiFiManagerParameter custom_blynk_token("blynk", "blynk token", blynk_token, 32);

  //WiFiManager
  //Local intialization. Once its business is done, there is no need to keep it around
  WiFiManager wifiManager;

  //set config save notify callback
  wifiManager.setSaveConfigCallback(saveConfigCallback);

  //set static ip
  wifiManager.setSTAStaticIPConfig(IPAddress(10,0,1,99), IPAddress(10,0,1,1), IPAddress(255,255,255,0));
  
  //add all your parameters here
  wifiManager.addParameter(&custom_mqtt_server);
  wifiManager.addParameter(&custom_mqtt_port);
  wifiManager.addParameter(&custom_blynk_token);

  //reset settings - for testing
  wifiManager.resetSettings();

  //set minimu quality of signal so it ignores AP's under that quality
  //defaults to 8%
  //wifiManager.setMinimumSignalQuality();
  
  //sets timeout until configuration portal gets turned off
  //useful to make it all retry or go to sleep
  //in seconds
  //wifiManager.setTimeout(120);

  //fetches ssid and pass and tries to connect
  //if it does not connect it starts an access point with the specified name
  //here  "AutoConnectAP"
  //and goes into a blocking loop awaiting configuration
  if (!wifiManager.autoConnect("WatchDog", "esptest")) {
    Serial.println("failed to connect and hit timeout");
    delay(3000);
    //reset and try again, or maybe put it to deep sleep
    ESP.reset();
    delay(5000);
  }

  //if you get here you have connected to the WiFi
  Serial.println("connected...yeey :)");

  //read updated parameters
  strcpy(mqtt_server, custom_mqtt_server.getValue());
  strcpy(mqtt_port, custom_mqtt_port.getValue());
  strcpy(blynk_token, custom_blynk_token.getValue());

  //save the custom parameters to FS
  if (shouldSaveConfig) {
    Serial.println("saving config");
    DynamicJsonBuffer jsonBuffer;
    JsonObject& json = jsonBuffer.createObject();
    json["mqtt_server"] = mqtt_server;
    json["mqtt_port"] = mqtt_port;
    json["blynk_token"] = blynk_token;

    File configFile = SPIFFS.open("/config.json", "w");
    if (!configFile) {
      Serial.println("failed to open config file for writing");
    }

    json.printTo(Serial);
    json.printTo(configFile);
    configFile.close();
    //end save
  }

  Serial.println("local ip");
  Serial.println(WiFi.localIP());
  
  Serial.println("ClosedCube HDC1080 Arduino Test");

  hdc1080.begin(0x40);

  Serial.print("Manufacturer ID=0x");
  Serial.println(hdc1080.readManufacturerId(), HEX); // 0x5449 ID of Texas Instruments
  Serial.print("Device ID=0x");
  Serial.println(hdc1080.readDeviceId(), HEX); // 0x1050 ID of the device
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.print("T=");
  Serial.print(hdc1080.readTemperature());
  Serial.print("C, RH=");
  Serial.print(hdc1080.readHumidity());
  Serial.println("%");
  Serial.println(mqtt_port);
  //Serial.println("");
// Serial.println(mqtt_server);
  delay(300);
  if (hdc1080.readHumidity() >= mqtt_port[2] || hdc1080.readTemperature() >= 30){
  digitalWrite(LED, HIGH);
}
else{
  digitalWrite(LED, LOW);

}

}