esp8266和Unity之间的Udp连接问题

Question

我正在尝试将Wemos D1 mini ESP8266板连接到unity，以便向unity发送按钮状态。

首先，我开发了Wemos D1 mini的代码，并使用UDP终端进行了检查，结果很好。我从终端向Wemos板发送了一条消息，并在串行监视器上显示了该消息。

我正在发回一条带有按钮状态的消息，它显示在UDP终端上。

然后我在Unity上写下了这个代码，并将其附在主摄像头上，我在Wemos D1 mini上收到了Unity发送的信息，但我无法阅读Wemos发送的信息。我注意到Socket.Available总是0。

除了我没有阅读返回消息之外，有时Unity也会崩溃(有时在我跑步时并不经常(。这是来自Arduino IDE的代码：

#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
//SSID of your network
char ssid[] = "TUI"; //SSID of your Wi-Fi router
char pass[] = "password"; //Password of your Wi-Fi router
int keyIndex = 0;
unsigned int localPort = 4000; 
char packetBuffer[255]; //buffer to hold incoming packet
char  ReplyBuffer[] = "";       // a string to send back
WiFiUDP Udp;
//input
const int buttonPin = 4;
const int ledpin = 5;
int buttonState = LOW;
void setup()
{
pinMode(buttonPin, INPUT);
pinMode(ledpin, OUTPUT);
IPAddress ip(192, 175, 0, 20); 
IPAddress gateway(192, 175, 0, 1); 
IPAddress subnet(255, 255, 255, 0); 
IPAddress DNS(192, 175, 0, 1); 
Serial.begin(115200);
WiFi.config(ip, gateway, subnet, DNS);  
delay(100); 
//WiFi.mode(WIFI_STA); 
WiFi.begin(ssid, pass); 
Serial.print("Connecting"); 
while (WiFi.status() != WL_CONNECTED) { 
Serial.print("."); 
delay(200);  
}   
while (WiFi.waitForConnectResult() != WL_CONNECTED) { 
Serial.println(); 
Serial.println("Fail connecting"); 
delay(5000); 
ESP.restart(); 
}   
Serial.print("   OK  "); 
Serial.print("Module IP: "); 
Serial.println(WiFi.localIP());
printWifiStatus(); 
// if you get a connection, report back via serial:
Udp.begin(localPort);
} 
void loop () {// if there's data available, read a packet
int packetSize = Udp.parsePacket();
if (packetSize) {
Serial.print("Received packet of size ");
Serial.println(packetSize);
Serial.print("From ");
IPAddress remoteIp = Udp.remoteIP();
Serial.print(remoteIp);
Serial.print(", port ");
Serial.println(Udp.remotePort());
// read the packet into packetBufffer
int len = Udp.read(packetBuffer, 255);
if (len > 0) {
packetBuffer[len] = 0;
}
Serial.println("Contents:");
Serial.println(packetBuffer);
String str(packetBuffer);
if(str == "hello from unity"){
digitalWrite(ledpin, HIGH); 
}
buttonState = digitalRead(buttonPin);
if(buttonState == HIGH){
String str1 = "Button1 pressed"; 
str1.toCharArray(ReplyBuffer, 50); 
}
else{
String str1 = "Button1 off"; 
str1.toCharArray(ReplyBuffer, 50);
}
Serial.println(ReplyBuffer);
Serial.println(Udp.remoteIP());
Serial.println(Udp.remotePort());
// send a reply, to the IP address and port that sent the packet
Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
Udp.write(ReplyBuffer);
Udp.endPacket();
}
else{
digitalWrite(ledpin, LOW);   
}
delay(10);
}

这是Unity:上的脚本

using UnityEngine;
using System.Net.Sockets;
using System.Text;
using System.Net;
using System;
public class ArduinoConnectUDP : MonoBehaviour
{
private void Update()
{
udpSend();
}
//Port and IP Data for Socket Client
void udpSend()
{
var IP = IPAddress.Parse("192.175.0.20"); 
int port = 4000; 
var udpClient1 = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
var sendEndPoint = new IPEndPoint(IP, port);
var receiveEndPoint = new IPEndPoint(IPAddress.Any, port);
var clientReturn = new UdpClient(4000);
try
{
//Sends a message to the host to which you have connected.
byte[] sendBytes = Encoding.ASCII.GetBytes("hello from unity");
udpClient1.SendTo(sendBytes, sendEndPoint);
Debug.Log(udpClient1.Available);
if (udpClient1.Available > 0)
{
// Blocks until a message returns on this socket from a remote host.
byte[] receiveBytes = clientReturn.Receive(ref receiveEndPoint);
string returnData = Encoding.ASCII.GetString(receiveBytes);
Debug.Log("Message Received: " +
returnData.ToString());
if (receiveBytes == null || receiveBytes.Length == 0)
{
Debug.Log("No Answer from Wemos");
}
}
udpClient1.Close();
clientReturn.Close();
}
catch (Exception e)
{
Debug.Log(e.ToString());
}
}
}

Answer 1

已解决！为了发送到端口4001(静态端口，因为我在接收随机端口上发送(，必须更改c#中的接收代码并更新arduino代码。

统一代码：

using System;
using System.Collections;
using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using UnityEngine;
public class esp8266Connection : MonoBehaviour {
Thread m_Thread;
UdpClient m_Client;

void Start()
{
m_Thread = new Thread(new ThreadStart(ReceiveData));
m_Thread.IsBackground = true;
m_Thread.Start();
}
private void Update()
{
udpSend();
}
void ReceiveData()
{
try
{
m_Client = new UdpClient(4001);
m_Client.EnableBroadcast = true;
while (true)
{
IPEndPoint hostIP = new IPEndPoint(IPAddress.Any, 0);
byte[] data = m_Client.Receive(ref hostIP);
string returnData = Encoding.ASCII.GetString(data);
Debug.Log(returnData);
}
}
catch (Exception e)
{
Debug.Log(e);
OnApplicationQuit();
}
}
private void OnApplicationQuit()
{
if (m_Thread != null)
{
m_Thread.Abort();
}
if (m_Client != null)
{
m_Client.Close();
}
}
void udpSend()
{
var IP = IPAddress.Parse("192.175.0.20");
int port = 4000;

var udpClient1 = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
var sendEndPoint = new IPEndPoint(IP, port);

try
{
//Sends a message to the host to which you have connected.
byte[] sendBytes = Encoding.ASCII.GetBytes("hello from unity");
udpClient1.SendTo(sendBytes, sendEndPoint);

}
catch (Exception e)
{
Debug.Log(e.ToString());
}
}
}

arduino代码：

#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
//SSID of your network
char ssid[] = "TUI"; //SSID of your Wi-Fi router
char pass[] = "password"; //Password of your Wi-Fi router
int keyIndex = 0;
unsigned int localPort = 4000; 
char packetBuffer[255]; //buffer to hold incoming packet
char  ReplyBuffer[] = "";       // a string to send back
WiFiUDP Udp;
//input
const int buttonPin = 4;
const int ledpin = D1;
int buttonState = LOW;

void setup()
{
pinMode(buttonPin, INPUT);
pinMode(ledpin, OUTPUT);
IPAddress ip(192, 175, 0, 20); 
IPAddress gateway(192, 175, 0, 1); 
IPAddress subnet(255, 255, 255, 0); 
IPAddress DNS(192, 175, 0, 1); 
Serial.begin(115200);
WiFi.config(ip, gateway, subnet, DNS);  
delay(100); 
//WiFi.mode(WIFI_STA); 
WiFi.begin(ssid, pass); 
Serial.print("Connecting"); 
while (WiFi.status() != WL_CONNECTED) { 
Serial.print("."); 
delay(200);  
}   
while (WiFi.waitForConnectResult() != WL_CONNECTED) { 
Serial.println(); 
Serial.println("Fail connecting"); 
delay(5000); 
ESP.restart(); 
}   
Serial.print("   OK  "); 
Serial.print("Module IP: "); 
Serial.println(WiFi.localIP());
printWifiStatus(); 
// if you get a connection, report back via serial:
Udp.begin(localPort);
} 
void loop () {// if there's data available, read a packet
int packetSize = Udp.parsePacket();
if (packetSize) {
Serial.print("Received packet of size ");
Serial.println(packetSize);
Serial.print("From ");
IPAddress remoteIp = Udp.remoteIP();
Serial.print(remoteIp);
Serial.print(", port ");
Serial.println(Udp.remotePort());
// read the packet into packetBufffer
int len = Udp.read(packetBuffer, 255);
if (len > 0) {
packetBuffer[len] = 0;
}
Serial.println("Contents:");
Serial.println(packetBuffer);
String str(packetBuffer);
if(str == "hello from unity"){
digitalWrite(ledpin, HIGH); 
}

buttonState = digitalRead(buttonPin);
if(buttonState == HIGH){
String str1 = "Button1 pressed"; 
str1.toCharArray(ReplyBuffer, 50); 
}
else{
String str1 = "Button1 off"; 
str1.toCharArray(ReplyBuffer, 50);
}
Serial.println(ReplyBuffer);
Serial.println(Udp.remoteIP());
Serial.println(Udp.remotePort());

// send a reply, to the IP address and port that sent the packet
Udp.beginPacket(Udp.remoteIP(), 4001);
Udp.write(ReplyBuffer);
Udp.endPacket();
}
else{
digitalWrite(ledpin, LOW);   
}
delay(10);
}
void printWifiStatus() {
// print the SSID of the network you're attached to:
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// print your WiFi shield's IP address:
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// print the received signal strength:
long rssi = WiFi.RSSI();
Serial.print("signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
}