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これは簡単なコードで、私はAndroidの携帯電話を使ってArduinoMKR1000にパスワードを送信し、ネットワーク上でパスワードを確認してギフトのロックを解除します。私はUDPソケットを使用します。 Arduinoのコードは次のとおりです。ArduinoとAndroidのUDPデータグラム
#include <SPI.h>
#include <WiFi101.h>
#include <WiFiUdp.h>
// TODO change this
int status = WL_IDLE_STATUS;
char ssid[] = "yourNetwork"; // your network SSID (name)
char pass[] = "secretPassword"; // your network password (use for WPA, or use
// as key for WEP)
unsigned int localPort = 2390; // local port to listen on
char packetBuffer[255]; // buffer to hold incoming packet
char replyRight[] = "you have your gift!"; // a string to send back
char replyWrong[] = "try again!";
WiFiUDP Udp;
// Array of passwords to choose from, expand it or fetch some words from the
// internet!
const int PasswordArrayLength=5;
String passwords[PasswordArrayLength] = {
"Merry",
"Christmas",
"42", // The meaning of everything must be here!
"Santa",
"HoHo"
};
bool checkPassword(); // Checks for the received password
void openGift(); // Unlocks the gift
void showWarning(); // Locks the gift and displays the warning
const int lockPin = 4;
const int warningLedPin = 5;
String guess; // password guess
void setup() {
// Initialize serial
Serial.begin(9600);
// attempt to connect to WiFi network:
while (status != WL_CONNECTED) {
Serial.print("Attempting to connect to Wifi: ");
Serial.println(ssid);
status = WiFi.begin(ssid, pass);
// wait 10 seconds for connection:
delay(10000);
}
Serial.println("Connected to wifi");
// print your WiFi shield's IP address, your phone will connect to this IP Address
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// 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)
{
// read the packet into packetBufffer
int len = Udp.read(packetBuffer, 255);
if (len > 0) packetBuffer[len] = 0; // Null terminate the string to avoid data corruption
Serial.println("Entered password:");
Serial.println(packetBuffer);
guess=String(packetBuffer); // Put the char array in a string to compare easily
if (checkPassword())
{
// Open the gift
openGift();
// Send the reply
Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
Udp.write(replyRight);
Udp.endPacket();
}
else
{
// Show alert
showWarning();
// Tell the sender to try again
Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
Udp.write(replyWrong);
Udp.endPacket();
}
}
}
void openGift()
{
digitalWrite(lockPin,HIGH); // Unlock the gift
digitalWrite(warningLedPin,LOW); // Turn of the warning if it was on
}
void showWarning()
{
digitalWrite(warningLedPin,LOW); // Turn on the warning led
digitalWrite(lockPin,HIGH); // Lock the gift
}
bool checkPassword()
{
for(int i =0; i < PasswordArrayLength; i++)
{
if(guess.equals(passwords[i]))
{
return true;
}
}
return false;
}
アンドロイドのコードがある一方で：
package com.example.ahmed.udpsender;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.text.Editable;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.EditText;
import android.widget.Toast;
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.util.regex.Pattern;
public class MainActivity extends AppCompatActivity
private DatagramSocket socket;
private EditText ipEditText;
private EditText portEditText;
private EditText messageEditText;
// Socket operation time out in milliseconds
private static final int TIMEOUT_MILLIS = 2000;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
// Get the handles of the text fields to use them in validation later
// NOTE: this must exist after "setContentView(R.layout.activity_main);"
ipEditText = ((EditText) findViewById(R.id.editTextIp));
portEditText = ((EditText) findViewById(R.id.editTextPort));
messageEditText = ((EditText) findViewById(R.id.textAreaMessage));
try {
socket = new DatagramSocket(); // Create a UDP socket
socket.setBroadcast(true); // Enable broadcasts
socket.setSoTimeout(TIMEOUT_MILLIS); // Set timeout for socket operations
} catch (SocketException e) {
showToast(e.getMessage());
}
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
onSendButtonClick();
}
});
}
@Override
public void onDestroy() {
super.onDestroy();
this.socket.close(); // Destroy the socket when the app closes
}
private void onSendButtonClick() {
final String ipString = ipEditText.getText().toString();
final String portString = portEditText.getText().toString();
boolean ipValidated = validateIp(ipString);
boolean portValidated = validatePort(portString);
if (!ipValidated && !portValidated) {
showToast("Ip and Port are invalid");
} else if (!ipValidated) {
showToast("IP is invalid");
} else if (!portValidated) {
showToast("Port number is invalid");
} else { // Parameters are syntactically correct
Editable editable = messageEditText.getText();
final String message = editable.toString(); // Get the text in the EditText
// Network operations must be started on a separate
// thread other than the UI thread
new Thread() {
public void run() {
if (sendPacket(message, ipString, Short.parseShort(portString))) {
String reply = receivePacket();
showToastOnUiThread(reply);
}
}
}.start();
editable.clear(); // Clear the message edit text
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private boolean validateIp(String ip) {
if (ip.length() == 0) return false;
if (!IP_ADDRESS.matcher(ip).matches()) {
// Show a message
showToast("Please enter a valid IP Address");
return false;
} else {
return true;
}
}
private boolean validatePort(String text) {
if (text.length() == 0) return false;
try {
Short.parseShort(text); // If this succeeds, then it's a valid port
return true;
} catch (NumberFormatException e) {
showToast("A valid port number is between 1 and " + Short.MAX_VALUE);
return false;
}
}
private boolean sendPacket(String message, String ipString, short portNumber) {
byte messageBytes[] = message.getBytes();
if (message.isEmpty()) return false;
try {
// Create the packet containing the message, IP and port number
final DatagramPacket packet = new DatagramPacket(messageBytes, messageBytes.length,
InetAddress.getByName(ipString), portNumber);
socket.send(packet);
// The UDP packet left the pc safely, we don't know if it was received somewhere
return true;
} catch (final UnknownHostException e) {
showToastOnUiThread("Couldn't find host");
return false;
} catch (final IOException e) {
showToastOnUiThread(e.getMessage());
return false; // Something went wrong
}
}
private String receivePacket() {
try {
byte buffer[] = new byte[255];
DatagramPacket p = new DatagramPacket(buffer, buffer.length);
socket.receive(p);
return new String(p.getData()); // Convert the packet to a string and return it
} catch (IOException ignored) {
}
// Nobody replied to the packet, maybe the address didn't exist in the network
return "Nothing received, timeout";
}
// A toast is the tiny message you see on the screen
private void showToastOnUiThread(final String text) {
runOnUiThread(new Runnable() {
@Override
public void run() {
showToast(text);
}
});
}
private void showToast(String message) {
Toast.makeText(getApplicationContext(), message, Toast.LENGTH_SHORT).show();
}
//--------------------------------------------------------------------------------------
// Regex for validating IP addresses
private static final Pattern IP_ADDRESS
= Pattern.compile(
"((25[0-5]|2[0-4][0-9]|[0-1][0-9]{2}|[1-9][0-9]|[1-9])\\.(25[0-5]|2[0-4]"
+ "[0-9]|[0-1][0-9]{2}|[1-9][0-9]|[1-9]|0)\\.(25[0-5]|2[0-4][0-9]|[0-1]"
+ "[0-9]{2}|[1-9][0-9]|[1-9]|0)\\.(25[0-5]|2[0-4][0-9]|[0-1][0-9]{2}"
+ "|[1-9][0-9]|[0-9]))");
}
問題は：私が入力したパスワードアンドロイド戻り乾杯をしようとすると、「何も、タイムアウトを受けていませんarduinoはvoidループ（）を止めています。何が問題ですか？私は同じ外部ホットスポットでarduinoとandroidをconnetedしました