【Android开发—智能家居系列】(四):UDP通信发送指令
最后更新于:2022-04-01 10:02:13
### 思路回顾
[【1】手机连接WIFI模块](http://blog.csdn.net/u010924834/article/details/49668623)
【2】UDP通信对WIFI模块发送指令,以和WIFI模块保持连接状态
【3】UDP通信对WIFI模块发送指令,让其搜索可用的无线网,返回WIFI列表
【4】发送指令,让WIFI模块接入指定路由
【5】手机连接路由
【6】发送指令,获得WIFI模块的动态IP地址
### UDP通信线程类
~~~
package com.jczb.smartlife.common;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
import android.os.Handler;
import android.os.Message;
import com.jczb.smartlife.common.Tool;
public class GetInfoThread extends Thread {
private Handler handler;
private DatagramSocket socket;
private int msgType;
private final String IP = "255.255.255.255";//广播地址
private int PORT = 26000;
/**
* 48899端口:C32x系列的端口,用户可以用AT指令更改
* 49000端口:除C32x系列,其他WIFI模块的端口
* 1902端口:有人掌控宝系列产品的端口
*/
private int targetPort = 49000 ;
private boolean receive = true;
/**
*
* @param handler 传入监听此线程的Handler
* @param intMsg 传入监听的消息类型
*/
public GetInfoThread(Handler handler,int msgType) {
this.handler = handler;
this.msgType=msgType;
init();
}
public void init(){
try {
socket = new DatagramSocket(null);
socket.setBroadcast(true);
socket.setReuseAddress(true);
socket.bind(new InetSocketAddress(PORT));
} catch (SocketException e) {
e.printStackTrace();
sendErrorMsg("Search Thread init fail");
return;
}
}
public void run() {
if (socket == null) {
return;
}
try {
byte[] data = new byte[1024];
//创建一个空的DatagramPacket对象
DatagramPacket revPacket = new DatagramPacket(data, data.length);
while (receive) {
//服务端接收数据
socket.receive(revPacket);
if(null!=handler){
byte[] realData = new byte[revPacket.getLength()];
System.arraycopy(data, 0, realData,0, realData.length);
Message msg =handler.obtainMessage(msgType,realData);
handler.sendMessage(msg);
}
}
} catch (Exception e) {
e.printStackTrace();
socket.close();
}
}
public void close() {
if (socket == null)
return;
socket.close();
}
private void sendErrorMsg(String info){
}
/**
* 发送数据
* @param msg
*/
public void sendMsg(byte[] msg) {
if (socket != null) {
try {
System.out.println("targetPort------------------->"+targetPort);
DatagramPacket sendPacket = new DatagramPacket(msg, msg.length,
InetAddress.getByName(IP), targetPort);
socket.send(sendPacket);
} catch (UnknownHostException e) {
e.printStackTrace();
System.out.println("发送失败");
} catch (IOException e) {
e.printStackTrace();
System.out.println("发送失败");
}
}
}
public void setReceive(boolean receive) {
this.receive = receive;
}
public void setTargetPort(int targetPort) {
this.targetPort = targetPort;
}
public void setMsgType(int msgType){
this.msgType=msgType;
}
}
~~~
### 发送消息的线程类
~~~
/**
* 发送消息的队列,每次发送数据时,只需要调用putMsg(byte[] data)方法
*
* @author usr_liujinqi
*
*/
private class SendMsgThread extends Thread {
// 发送消息的队列
private Queue<byte[]> sendMsgQuene = new LinkedList<byte[]>();
// 是否发送消息
private boolean send = true;
private GetInfoThread ss;
public SendMsgThread(GetInfoThread ss) {
this.ss = ss;
}
public synchronized void putMsg(byte[] msg) {
// 唤醒线程
if (sendMsgQuene.size() == 0)
notify();
sendMsgQuene.offer(msg);
}
public void run() {
synchronized (this) {
while (send) {
// 当队列里的消息发送完毕后,线程等待
while (sendMsgQuene.size() > 0) {
byte[] msg = sendMsgQuene.poll();
if (ss != null)
ss.sendMsg(msg);
}
try {
wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
public void setSend(boolean send) {
this.send = send;
}
}
~~~
### 应用
【举例】发送搜索WIFI模块的指令
~~~
//1.用户获得温控器中WIFI模块的WIFI模块的IP地址,MAC地址,模块名称的指令
private final byte[] getInfoCode=new byte[]{(byte)0x48,0x46,0x2D,0x41,0x31,0x31,0x41,0x53,0x53,0x49,0x53,0x54,0x48,0x52,0x45,0x41,0x44};
public static final int REC_Module=0x04;//搜索WIFI模块的信息(包括IP、Mac、名称)
//实例化一个线程,用户获得模块信息(IP,Mac,名称)
//参数为监听为此线程的Handler,以及接收成功后,给Handler发送的消息类型
getInfoThread = new GetInfoThread(handler,Tool.REC_Module);
getInfoThread.start();
//发送消息的线程
smt = new SendMsgThread(getInfoThread);
smt.start();
//设置发送的目的端口号
getInfoThread.setTargetPort(Integer.parseInt("48899"));
smt.putMsg(getInfoCode);
~~~
> WIFI模块在接收到指令后,就会回复信息,以下的Handler就是针对回复过来的信息进行解析处理等操作。
~~~
//处理消息的Handler
private Handler handler= new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
case Tool.REC_Module:// 解析接收到的数据
//设置发送的目的端口号
getInfoThread.setTargetPort(Integer.parseInt("48899"));
getInfoThread.setMsgType(Tool.REC_OK);
smt.putMsg(okCode);
SetServer();
SetDHCP();
byte[] data = (byte[]) msg.obj;
//将十进制的数据转化成十六进制数据
String strTemp= Tool.bytesToHexString(data);
//将十六进制的字符串去掉空格之后进行解析
String strdecode=Tool.DecodeHex(strTemp.replace(" ", ""));
//取出IP,Mac地址,模块名称
decodeIP(strdecode);
Toast.makeText(ConnectWifiActivity.this, "获得WIFI模块名称成功!"+ModuleName, Toast.LENGTH_SHORT).show();
break;
case Tool.REC_Server:
byte[] dataServer = (byte[])msg.obj;
//将十进制的数据转化成十六进制数据
String strServer= Tool.bytesToHexString(dataServer);
if("2b 6f 6b 0d 0a 0d 0a ".equals(strServer)){
Toast.makeText(ConnectWifiActivity.this, "设置服务器成功!", Toast.LENGTH_SHORT).show();
}
break;
case Tool.REC_SSID:
byte[] dataSSID=(byte[])msg.obj;
Tool.bytesToHexString(dataSSID);
decodeData(dataSSID);
break;
case Tool.REC_AT:
byte[] dataID = (byte[]) msg.obj;
//将十进制的数据转化成十六进制数据
String strTempID= Tool.bytesToHexString(dataID);
//将十六进制的字符串去掉空格之后进行解析
String strdecodeID=Tool.DecodeHex(strTempID.replace(" ", ""));
break;
case Tool.REC_DHCP:
byte[] dataDHCP = (byte[])msg.obj;
//将十进制的数据转化成十六进制数据
String strDHCP= Tool.bytesToHexString(dataDHCP);
if("2b 6f 6b 0d 0a 0d 0a ".equals(strDHCP)){
Toast.makeText(ConnectWifiActivity.this, "设置DHCP网络参数成功!", Toast.LENGTH_SHORT).show();
}
break;
default:
byte[] data1 = (byte[]) msg.obj;
//将十进制的数据转化成十六进制数据
String strTemp1= Tool.bytesToHexString(data1);
Toast.makeText(ConnectWifiActivity.this, strTemp1, Toast.LENGTH_SHORT).show();
break;
}
}
};
~~~
### 总结
凡是需要对WIFI模块发送指令的,就需要用到上述的两个线程类,还有一个对返回信息进行处理的Handler。只是发送的指令的code不一样,如上述表示的是搜索WIFI模块的十六进制的指令。不管WIFI模块在AP模式下还是STA模式,通信的最开始步骤都是先搜索模块,然后获得它的IP和Mac之后,立即回复+ok指令,就可以保持连接状态。
### Demo下载
[UDP通信发送指令Demo](http://download.csdn.net/detail/u010924834/9271385)