使用c#连接NodeMCU服务器
本文关键字：服务器 NodeMCU 连接 使用 | 更新日期: 2023-09-27 18:16:30
我有一个带有ESP8266E芯片的NodeMCU 0.9板。我可以打开和关闭一个LED使用简单的代码下面。此代码使用Arduino IDE编写。
#include <ESP8266WiFi.h>
const char* ssid = "iPhone";
const char* password = "1234567890ABCD";
int ledPin = D0; // GPIO16
WiFiServer server(80);
void setup() {
Serial.begin(9600);
delay(10);
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, LOW);
// Connect to WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
// Start the server
server.begin();
Serial.println("Server started");
// Print the IP address
Serial.print("Use this URL to connect: ");
Serial.print("http://");
Serial.print(WiFi.localIP());
Serial.println("/");
}
void loop() {
// Check if a client has connected
WiFiClient client = server.available();
if (!client) {
return;
}
// Wait until the client sends some data
Serial.println("new client");
while(!client.available()){
delay(1);
}
// Read the first line of the request
//String request = client.readStringUntil(''r');
String request = client.readString();
Serial.println(request);
client.flush();
// Match the request
int value = LOW;
if (request.indexOf("/LED=ON") != -1) {
digitalWrite(ledPin, LOW);
value = LOW;
}
if (request.indexOf("/LED=OFF") != -1) {
digitalWrite(ledPin, HIGH);
value = HIGH;
}
// Set ledPin according to the request
//digitalWrite(ledPin, value);
// Return the response
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println(""); // do not forget this one
client.println("<!DOCTYPE HTML>");
client.println("<html>");
client.print("Led pin is now: ");
if(value == LOW) {
client.print("On");
} else {
client.print("Off");
}
client.println("<br><br>");
client.println("<a href='"/LED=ON'"'"><button>Turn On </button></a>");
client.println("<a href='"/LED=OFF'"'"><button>Turn Off </button></a><br />");
client.println("</html>");
delay(1);
Serial.println("Client disonnected");
Serial.println("");
}
然后我可以使用我的web浏览器连接到NodeMCU并打开和关闭LED。NodeMCU还将LED状态数据发送给浏览器。但是，我想使用c#表单应用程序来实现。我尝试了这个代码。在Visual Studio 2013中没有出现任何编译错误。但是，它无法连接到NodeMCU服务器。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Net;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
static TcpClient tcpClient = new TcpClient();
public static readonly byte[] ip = new byte[] { 172, 20, 10, 2 };
static IPAddress ipAddress = new IPAddress(ip);
IPEndPoint hostEndPoint = new IPEndPoint(ipAddress, 80);
static Socket soc = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);
ASCIIEncoding asen = new ASCIIEncoding();
public Form1()
{
InitializeComponent();
}
private void button2_Click(object sender, EventArgs e)
{
soc.Connect(ipAddress, 80);
NetworkStream stm = new NetworkStream(soc);
tcpClient.Connect(ipAddress, 80);
stm = tcpClient.GetStream();
byte[] ba = asen.GetBytes("/LED=ON/r");
stm.Write(ba,0,ba.Length);
}
private void button3_Click(object sender, EventArgs e)
{
soc.Connect(ipAddress, 80);
NetworkStream stm = new NetworkStream(soc);
tcpClient.Connect(ipAddress, 80);
stm = tcpClient.GetStream();
byte[] ba = asen.GetBytes("/LED=OFF/r");
stm.Write(ba, 0, ba.Length);
}
}
}
帮助我在c#中实现一个代码
虽然您可以使用低级api发出HTTP请求，但使用HttpClient类会更好:https://msdn.microsoft.com/en-us/library/system.net.http.httpclient(v=vs.110).aspx
button2事件处理程序的一个简单示例:
private async void button2_Click(object sender, EventArgs e)
{
using (var client = new HttpClient())
{
HttpResponseMessage request = await client.GetAsync("http://172.16.20.10/LED=on");
}
}