Esp8266
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
const char *ssid = "dsx_zj"; //网络名称
const char *password = "dsxbs725"; //网络密码
WiFiUDP Udp;
unsigned int udpPort = 8081; // 本地端口号
const int rec_data_len = 128;
char incomingPacket[rec_data_len]; // 接收缓冲区
const int client_udpPort = 8081; //客户端端口号
const int pin1 = 2;const int pin2 = 0;const int pin3 = 4;
void setup()
{
Serial.begin(115200);
pinMode(pin1, OUTPUT);pinMode(pin2, OUTPUT);pinMode(pin3, OUTPUT);
digitalWrite(pin1, HIGH); digitalWrite(pin2, HIGH);digitalWrite(pin3, HIGH);
Serial.println();
Serial.printf("Connecting to %s ", ssid);
WiFi.mode(WIFI_STA);
WiFi.setAutoConnect(false);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
Serial.println("WiFi connected!");
//以下开启UDP监听并打印输出信息
Udp.begin(udpPort);
Serial.printf("Now listening at IP %s, UDP port %d\n", WiFi.localIP().toString().c_str(), udpPort);
}
void loop()
{
int packetSize = Udp.parsePacket(); //获取当前队首数据包长度
if (packetSize) // 有数据可用
{
Serial.printf("Received %d bytes from %s, port %d\n", packetSize, Udp.remoteIP().toString().c_str(), Udp.remotePort());
int len = Udp.read(incomingPacket, rec_data_len); // 读取数据到incomingPacket
if (len > 0) // 如果正确读取
{
incomingPacket[len] = 0; //末尾补0结束字符串
Serial.printf("UDP packet contents: %s\n", incomingPacket);
if (strcmp(incomingPacket, "red") == 0) // 如果收到Turn off
{
digitalWrite(pin1, LOW); digitalWrite(pin2, HIGH);digitalWrite(pin3, HIGH);
Udp.beginPacket(Udp.remoteIP(), client_udpPort);
Udp.write("LED Red!"); // 回复LED has been turn off
Udp.endPacket();
}
else if (strcmp(incomingPacket, "green") == 0) // 如果收到Turn on
{
digitalWrite(pin1, HIGH); digitalWrite(pin2, LOW);digitalWrite(pin3, HIGH);
Udp.beginPacket(Udp.remoteIP(), client_udpPort);
Udp.write("LED Green!"); // 回复LED has been turn off
Udp.endPacket();
}
else if (strcmp(incomingPacket, "blue") == 0) // 如果收到Turn on
{
digitalWrite(pin1, HIGH); digitalWrite(pin2, HIGH);digitalWrite(pin3, LOW);
Udp.beginPacket(Udp.remoteIP(), client_udpPort);
Udp.write("LED Blue!"); // 回复LED has been turn off
Udp.endPacket();
}
else // 如果非指定消息
{
digitalWrite(pin1, HIGH); digitalWrite(pin2, HIGH);digitalWrite(pin3, HIGH);
Udp.beginPacket(Udp.remoteIP(), client_udpPort);
Udp.write("Data Error!"); // 回复Data Error!
Udp.endPacket();
}
}
}
}
app
package com.example.esp8266app;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class MainActivity extends AppCompatActivity {
private Button send; //发送按钮
private EditText content;
private TextView rec_content;
public static final String local_ip = "192.168.2.201"; //本机ip
public static final int local_recv_port = 8081; //本机接收udp绑定的端口
public static final String client_ip = "192.168.2.203"; //客户端IP
public static final int client_port = 8081;//客户端port
private DatagramSocket socket; //接收数据用的socket
int data_len = 127;//与esp32cam约定的数据传输的长度
byte[] RevBuff = new byte[data_len];//定义接收数据流的包的大小
MyHandler myHandler; //处理信息
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myHandler = new MyHandler();
content = findViewById(R.id.content);
rec_content = findViewById(R.id.rec_content);
//生成接受数据使用的socket
try {
InetAddress local_serverAdder = InetAddress.getByName(local_ip); //本手机的ip地址
socket = new DatagramSocket(local_recv_port,local_serverAdder);
} catch (SocketException | UnknownHostException e) {
e.printStackTrace();
}
// 启动接收数据的线程
new Thread(new Recv()).start();
// 发送数据
send = findViewById(R.id.send);
send.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
new Thread((new Send())).start(); //启动发送数据线程 发送一次数据
}
});
}
// 接收数据的线程
public class Recv implements Runnable {
public void run() {
// 接收UDP广播,有的手机不支持
while (true) {
byte[] recbuf = new byte[data_len];
DatagramPacket recpacket = new DatagramPacket(recbuf,
recbuf.length);
try {
socket.receive(recpacket);
RevBuff = recpacket.getData();
Message msg = myHandler.obtainMessage();
msg.what = 3;
msg.obj = RevBuff;
msg.arg1 = RevBuff.length;
myHandler.sendMessage(msg);
//Log.v("Tag:",new String(RevBuff));
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
// 发送数据线程
public class Send implements Runnable {
@Override
public void run() {
try {
InetAddress client_serverAdder = InetAddress.getByName(client_ip);
DatagramSocket send_socket = new DatagramSocket();
String tmp = content.getText().toString();
byte[] buf = tmp.getBytes();
DatagramPacket send_packet = new DatagramPacket(buf, buf.length, client_serverAdder, client_port);
send_socket.send(send_packet);
send_socket.close();
Thread.sleep(100);
} catch (SocketException | UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
//处理一些不能在线程里面执行的信息
class MyHandler extends Handler {
public void handleMessage(Message msg){
super.handleMessage(msg);
switch (msg.what){
case 0:
// 连接服务器成功信息
break;
case 1:
// 连接服务器失败信息
break;
case 2:
// 处理接收到的非图像数据
break;
case 3:
byte[] tmp = new byte[msg.arg1];
System.arraycopy((byte[])msg.obj,0,tmp,0,msg.arg1);
SimpleDateFormat formatter= new SimpleDateFormat("yyyy-MM-dd 'at' HH:mm:ss z");
Date date = new Date(System.currentTimeMillis());
String content = (new String(tmp)) + "----" + formatter.format(date) + "\n";
rec_content.append(content);
break;
default: break;
}
}
}
@Override
protected void onDestroy() {
super.onDestroy();
socket.close(); //关闭接收使用的socket
System.out.println("UDP Client程序退出,关掉socket,停止广播");
}
}
<uses-permission android:name="android.permission.INTERNET"/>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<TextView
android:id="@+id/rec_content"
android:layout_width="match_parent"
android:layout_height="500dp" />
<EditText
android:id="@+id/content"
android:layout_width="match_parent"
android:layout_height="60dp" />
<Button
android:id="@+id/send"
android:layout_width="match_parent"
android:layout_height="60dp"
android:text="发送" />
</LinearLayout>