Question

我正在编写一个家庭物联网项目。主服务器使用Express JS用Node.js编写，所有外围设备都使用ESP8266通过WiFi网络连接到服务器。

我想要完成的事情非常简单。其中一个组件是RGB灯泡。用户可以更改灯泡的颜色或功率（打开和关闭）。

为了更改灯泡的颜色，我想从Node.js服务器向ESP8266发送一个POST请求，其中包含非常简单的主体，包括：

{"red" : 255, "green" : 128, "blue" : 0}

要从Node.js服务器发送请求，我使用request npm包。请求如下所示：

const options = {
        url: 'http://192.168.1.226:80/changeBulbColor',
        method: 'POST',
        json: {
            "red": 255,
            "green": 255,
            "blue": 255
        },
        headers: {
            "Content-Type": "application/json"
        }
    };

    request(options, callback);

我还尝试了一个版本的请求，我将json切换为body并添加了一个额外的字段json: true。

当我尝试使用curl发送请求时，一切都很好。这是有效的curl命令：

curl -vv -X POST -d "{"power":false}" "Content-Type: application/json" http://192.168.1.226/changeBulbPower

当我尝试使用request库并从Node.js服务器发送POST时，来到ESP8266的body始终为空。当我试图记录身体参数的数量时。我得到了0。

ESP8266的代码：

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include <ArduinoJson.h>
#include <ESP8266HTTPClient.h>

const char* ssid = "ssid";
const char* password = "password";

bool isOn = false;
const int redPin = 0;
const int bluePin = 1;
const int greenPin = 2;

struct Color {
  int R;
  int G;
  int B;
};

bool isInSetupMode = false;

Color* bulbColor;

ESP8266WebServer server(80);

void handleRoot() {
    String response = "<html><head></head><body>";
    response+= "Lightbulb is ";
    response+= ((isOn == 1) ? "on" : "off");
    response += "</br>";
    response += "Value of red: " + String (bulbColor -> R );
    response += "</br>Value of green: " + String (bulbColor -> G );
    response += "</br>Value of blue: " + String (bulbColor -> B );
    IPAddress myIP = WiFi.localIP();
    response+= "<br> Device's IP address: ";
    response+= String(myIP[0]);
    response+= ".";
    response+= String(myIP[1]);
    response+= ".";
    response+= String(myIP[2]);
    response+= ".";
    response+= String(myIP[3]);
    response+= "</body></html>";
    server.send(200,"text/html",response);
}

void handleBulbRequest() {
  Serial.println(server.arg("plain"));
  Serial.println(server.args());  
  for(int i = 0; i < server.args(); i++ ) {
    Serial.print(server.argName(i) + ": ");
    Serial.println(server.arg(i));
  }
  StaticJsonBuffer<200> jsonBuffer;
  JsonObject& root = jsonBuffer.parseObject(server.arg("plain"));
  if(!root.success()){
    server.send(400);
    return;
  }

  bulbColor->R = root["red"];
  bulbColor->G = root["green"];
  bulbColor->B = root["blue"];
  if(isOn) {
    analogWrite(redPin, bulbColor->R);
    analogWrite(greenPin, bulbColor->G);
    analogWrite(bluePin, bulbColor->B);
  }
  server.send(200);
}

void onPowerChange() {
  StaticJsonBuffer<200> jsonBuffer;
  JsonObject& root = jsonBuffer.parseObject(server.arg("plain"));
  if(!root.success()){
    server.send(400);
    return;
  }

  isOn = root["power"];

  if(isOn) {
    analogWrite(redPin, bulbColor->R);
    analogWrite(greenPin, bulbColor->G);
    analogWrite(bluePin, bulbColor->B);
  } else {
    analogWrite(redPin, 1);
    analogWrite(greenPin, 1);
    analogWrite(bluePin, 1);
  }
  server.send(200);
}

void onAssignDevice() {
  StaticJsonBuffer<200> jsonBuffer;
  JsonObject& root = jsonBuffer.parseObject(server.arg("plain"));
  if(!root.success()) {
    server.send(400);
    return;
  }
  isInSetupMode = root["highlight"];
  server.send(200);
}

void handleNotFound(){
  String message = "File Not Found\n\n";
  message += "URI: ";
  message += server.uri();
  message += "\nMethod: ";
  message += (server.method() == HTTP_GET)?"GET":"POST";
  message += "\nArguments: ";
  message += server.args();
  message += "\n";
  for (uint8_t i=0; i<server.args(); i++){
    message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
  }
  server.send(404, "text/plain", message);
}

void setup(void) {
  Serial.begin(74880);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  } 

  server.on("/", HTTP_GET , handleRoot);
  server.on("/changeBulbColor", HTTP_POST, handleBulbRequest);
  server.on("/highlightDevice", onAssignDevice);
  server.on("/changeBulbPower", onPowerChange);
  server.onNotFound(handleNotFound);

  bulbColor = new Color();
  bulbColor->R = 1;
  bulbColor->G = 1;
  bulbColor->B = 1;

  sendMessageToServerDebug();
  server.begin();
}

void loop(void) {
  server.handleClient();
  if(isInSetupMode) {
    digitalWrite(greenPin, HIGH);
    delay(250);
    digitalWrite(greenPin, LOW);
    delay(750);
  }
}

void sendMessageToServer() {
  HTTPClient http;
  http.begin("http://192.168.43.197:4000/registerDevice"); //HTTP
  http.addHeader("Content-Type", "application/json");
  IPAddress myIP = WiFi.localIP();
  String json = "{\"ip\""" + String(myIP[0]) + "." + String(myIP[1]) + "." + String(myIP[2]) + "." + String(myIP[3]) + "\",";
  json += "\"mac\""";
  json += WiFi.macAddress() + "\",\"deviceType\""LIGHTS\"}";
  int httpCode = http.POST(json);
  if(httpCode > 0) {
    if(httpCode == HTTP_CODE_OK) {
      String payload = http.getString();
    }
  } else {
  }
  http.end();
}

void sendMessageToServerDebug() {
  HTTPClient http;
  http.begin("http://192.168.1.79:8080/registerDevice"); //HTTP
  http.addHeader("Content-Type", "application/json");
  IPAddress myIP = WiFi.localIP();
  String json = "{\"ip\""" + String(myIP[0]) + "." + String(myIP[1]) + "." + String(myIP[2]) + "." + String(myIP[3]) + "\",";
  json += "\"mac\""";
  json += WiFi.macAddress() + "\",\"deviceType\""LIGHTS\"}";
  int httpCode = http.POST(json);
  if(httpCode > 0) {
    if(httpCode == HTTP_CODE_OK) {
      String payload = http.getString();
    }
  } else {
  }
  http.end();
}

ESP8266无法处理来自node.js服务器的传入POST请求

0 个答案: