javascript - ESP8266 拒绝连接到 Raspberry Pi Zero W

Question

我正在建立一个气象站并尝试使用我的 NodeMCU ESP8266 写入我的数据库。因此，我连接到 Node.js 服务器，我的 API 处理数据库。当我在我的 Windows 机器上运行服务器代码时，它工作得很好。我在 Raspberry Pi Zero W 上安装了所有东西，当我用浏览器或 Postman 对其进行测试时，它仍然可以工作……但不幸的是，我的 ESP 现在拒绝建立连接。有人知道这是什么原因吗？

Arduino代码：

#include <ArduinoJson.h>
#include <ESP8266HTTPClient.h>
#include <Adafruit_BMP085.h>
#include <ESP8266WiFi.h>
#include <Wire.h>

//declare
Adafruit_BMP085 bmp;
HTTPClient http;
StaticJsonBuffer<256> jsonBuffer;
JsonObject& root = jsonBuffer.createObject();

char ssid[] = //SSID;
char key[] = //PASSWORD;


//declare variables
float temperature = 0.0;
float pressure = 0.0;
float pressureSea = 0.0;
float rssi = 0.0;
String mac = "00:00:00:00:00:00";
char payload[256];

void setup() {
// --------------- WIFI Configuration --------------
    Serial.begin(115200);
    while (!Serial);
    Serial.println();

    WiFi.begin(ssid, key);

    Serial.print("Connecting");
    while (WiFi.status() != WL_CONNECTED)
    {
        delay(500);
        Serial.print(".");
    }
    Serial.println();

    Serial.print("Connected, IP address: ");
    Serial.println(WiFi.localIP());

// ---------------- Sensor Config --------------------

    Wire.pins(5, 4);
    Wire.begin(5, 4);

    if (!bmp.begin()) {
        Serial.println("No BMP180 / BMP085");// we dont wait for this
        while (1) {}
      }
    }

void loop() {

    measure();
    sendData();

    Serial.print("Temperatur: ");
    Serial.print(temperature);
    Serial.println(" °C");

    Serial.print("Druck: ");
    Serial.print(pressure);
    Serial.println(" hPa");

    Serial.print("RSSI: ");
    Serial.println(rssi);
    Serial.print("MAC: ");
    Serial.println(mac);


    Serial.println();

    delay(10000);
}

void measure () {

    // Environment Measure
    temperature = bmp.readTemperature();
    pressure = bmp.readPressure() / 100;

    // Signal Measure
    rssi = WiFi.RSSI();
    mac = WiFi.macAddress();

}

void sendData () {

    root["temp"] = temperature;
    root["press"] = pressure;
    root["rssi"] = rssi;
    root.printTo(payload, sizeof(payload));

    Serial.println(payload);

    http.begin("http://192.168.87.76:3000/api/weather");
    http.addHeader("Content-Type", "application/json");
    int httpCode = http.POST(payload);
    //http.writeToStream(&Serial);
    http.end();

    Serial.println(httpCode);
    if (httpCode < 0) {
    Serial.printf("Request failed: %s\n", http.errorToString(httpCode).c_str());}

    Serial.println();
}

Node.js-服务器：

// SERVER SETUP

// Get dependencies
const express = require('express');
const path = require('path');
const http = require('http');
const bodyParser = require('body-parser');
const cors = require('cors')

// Get our API routes
const api = require('./server/routes/api');

const app = express();

//Enable CORS
app.use(cors());

// Parsers for POST data
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

// Point static path to dist
app.use(express.static(path.join(__dirname, 'dist')));

// Set our api routes
app.use('/api', api);

// Catch all other routes and return the index file
app.get('*', (req, res) => {
  res.sendFile(path.join(__dirname, 'dist/index.html'));
});

/**
 * Get port from environment and store in Express.
 */
const port = process.env.PORT || '3000';
app.set('port', port);


/**
 * Listen on provided port, on all network interfaces.
 */
app.listen(port,'0.0.0.0');

HTTP客户端调试器的输出：

[HTTP-Client][begin] url: http://192.168.87.51:3000/api/weather
[HTTP-Client][begin] host: 192.168.87.51 port: 3000 url: /api/weather
Status: 0
[HTTP-Client] failed connect to 192.168.87.51:3000
[HTTP-Client][returnError] error(-1): connection refused
[HTTP-Client][end] tcp is closed
-1
Request failed: connection refused

Pi上的Netstat：

sudo netstat -tulpen
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       User       Inode      PID/Program name
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      0          11766      466/sshd
tcp        0      0 0.0.0.0:3000            0.0.0.0:*               LISTEN      1000       12846      590/node
tcp        0      0 0.0.0.0:5432            0.0.0.0:*               LISTEN      109        10991      354/postgres
tcp6       0      0 :::22                   :::*                    LISTEN      0          11773      466/sshd
tcp6       0      0 :::5432                 :::*                    LISTEN      109        10992      354/postgres
udp        0      0 0.0.0.0:5353            0.0.0.0:*                           108        10184      238/avahi-daemon: r
udp        0      0 0.0.0.0:68              0.0.0.0:*                           0          10888      450/dhcpcd
udp        0      0 0.0.0.0:48824           0.0.0.0:*                           108        10186      238/avahi-daemon: r
udp6       0      0 :::5353                 :::*                                108        10185      238/avahi-daemon: r
udp6       0      0 :::34435                :::*                                108        10187      238/avahi-daemon: r

如果您有任何线索或任何提示，我非常感谢！谢谢！

标签： javascripthttparduinoraspberry-piesp8266