Я занимаюсь проектом Android Things.
Я хочу опубликовать строковое сообщение в Google Cloud IoT Core, но отображаются ошибки.
Я использую Raspberry Pi 3 с ОС Android Things и программирую его с помощью Android Studio.
Скриншот ошибки:
Это весь код:
AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="cacaosd.com.sample1">
<!-- PAHO Permissions -->
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<!-- PAHO Permissions -->
<application>
<uses-library android:name="com.google.android.things"/>
<!-- Mqtt Service -->
<service android:name="org.eclipse.paho.android.service.MqttService" />
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.IOT_LAUNCHER"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
</application>
</manifest>
IotCoreCommunicator Class
package cacaosd.com.sample1;
import android.content.Context;
import android.util.Log;
import java.util.concurrent.TimeUnit;
import org.eclipse.paho.android.service.MqttAndroidClient;
import org.eclipse.paho.client.mqttv3.IMqttActionListener;
import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.IMqttToken;
import org.eclipse.paho.client.mqttv3.MqttCallback;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttMessage;
public class IotCoreCommunicator {
private static final String SERVER_URI = "ssl://mqtt.googleapis.com:8883";
public static class Builder {
private Context context;
private String projectId;
private String cloudRegion;
private String registryId;
private String deviceId;
private int privateKeyRawFileId;
public Builder withContext(Context context) {
this.context = context;
return this;
}
public Builder withProjectId(String projectId) {
this.projectId = projectId;
return this;
}
public Builder withCloudRegion(String cloudRegion) {
this.cloudRegion = cloudRegion;
return this;
}
public Builder withRegistryId(String registryId) {
this.registryId = registryId;
return this;
}
public Builder withDeviceId(String deviceId) {
this.deviceId = deviceId;
return this;
}
public Builder withPrivateKeyRawFileId(int privateKeyRawFileId) {
this.privateKeyRawFileId = privateKeyRawFileId;
return this;
}
public IotCoreCommunicator build() {
if (context == null) {
throw new IllegalStateException("context must not be null");
}
if (projectId == null) {
throw new IllegalStateException("projectId must not be null");
}
if (cloudRegion == null) {
throw new IllegalStateException("cloudRegion must not be null");
}
if (registryId == null) {
throw new IllegalStateException("registryId must not be null");
}
if (deviceId == null) {
throw new IllegalStateException("deviceId must not be null");
}
String clientId = "projects/" + projectId + "/locations/" + cloudRegion + "/registries/" + registryId + "/devices/" + deviceId;
if (privateKeyRawFileId == 0) {
throw new IllegalStateException("privateKeyRawFileId must not be 0");
}
MqttAndroidClient client = new MqttAndroidClient(context, SERVER_URI, clientId);
IotCorePasswordGenerator passwordGenerator = new IotCorePasswordGenerator(projectId, context.getResources(), privateKeyRawFileId);
return new IotCoreCommunicator(client, deviceId, passwordGenerator);
}
}
private final MqttAndroidClient client;
private final String deviceId;
private final IotCorePasswordGenerator passwordGenerator;
IotCoreCommunicator(MqttAndroidClient client, String deviceId, IotCorePasswordGenerator passwordGenerator) {
this.client = client;
this.deviceId = deviceId;
this.passwordGenerator = passwordGenerator;
}
public void connect() {
monitorConnection();
clientConnect();
subscribeToConfigChanges();
}
private void monitorConnection() {
client.setCallback(new MqttCallback() {
@Override
public void connectionLost(Throwable cause) {
Log.e("TUT", "connection lost", cause);
}
@Override
public void messageArrived(String topic, MqttMessage message) throws Exception {
Log.d("TUT", "message arrived " + topic + " MSG " + message);
// You need to do something with messages when they arrive
}
@Override
public void deliveryComplete(IMqttDeliveryToken token) {
Log.d("TUT", "delivery complete " + token);
}
});
}
private void clientConnect() {
try {
MqttConnectOptions connectOptions = new MqttConnectOptions();
// Note that the the Google Cloud IoT Core only supports MQTT 3.1.1, and Paho requires that we explicitly set this.
// If you don't, the server will immediately close its connection to your device.
connectOptions.setMqttVersion(MqttConnectOptions.MQTT_VERSION_3_1_1);
// With Google Cloud IoT Core, the username field is ignored, however it must be set for the
// Paho client library to send the password field. The password field is used to transmit a JWT to authorize the device.
connectOptions.setUserName("unused-but-necessary");
connectOptions.setPassword(passwordGenerator.createJwtRsaPassword());
IMqttToken iMqttToken = client.connect(connectOptions);
iMqttToken.setActionCallback(new IMqttActionListener() {
@Override
public void onSuccess(IMqttToken asyncActionToken) {
Log.d("TUT", "success, connected");
}
@Override
public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
Log.e("TUT", "failure, not connected", exception);
}
});
iMqttToken.waitForCompletion(TimeUnit.SECONDS.toMillis(30));
Log.d("TUT", "IoT Core connection established.");
} catch (MqttException e) {
throw new IllegalStateException(e);
}
}
/**
* Configuration is managed and sent from the IoT Core Platform
*/
private void subscribeToConfigChanges() {
try {
client.subscribe("/devices/" + deviceId + "/config", 1);
} catch (MqttException e) {
throw new IllegalStateException(e);
}
}
public void publishMessage(String subtopic, String message) {
String topic = "/devices/" + deviceId + "/" + subtopic;
String payload = "{msg:\"" + message + "\"}";
MqttMessage mqttMessage = new MqttMessage(payload.getBytes());
mqttMessage.setQos(1);
try {
client.publish(topic, mqttMessage);
Log.d("TUT", "IoT Core message published. To topic: " + topic);
} catch (MqttException e) {
throw new IllegalStateException(e);
}
}
public void disconnect() {
try {
Log.d("TUT", "IoT Core connection disconnected.");
client.disconnect();
} catch (MqttException e) {
throw new IllegalStateException(e);
}
}
}
IotCorePasswordGenerator Class
package cacaosd.com.sample1;
import android.content.res.Resources;
import android.util.Base64;
import java.io.IOException;
import java.io.InputStream;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.time.Duration;
import java.time.Instant;
import java.util.Date;
import io.jsonwebtoken.JwtBuilder;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
class IotCorePasswordGenerator {
private final String projectId;
private final Resources resources;
private final int privateKeyRawFileId;
IotCorePasswordGenerator(String projectId, Resources resources, int privateKeyRawFileId) {
this.projectId = projectId;
this.resources = resources;
this.privateKeyRawFileId = privateKeyRawFileId;
}
char[] createJwtRsaPassword() {
try {
byte[] privateKeyBytes = decodePrivateKey(resources, privateKeyRawFileId);
return createJwtRsaPassword(projectId, privateKeyBytes).toCharArray();
} catch (NoSuchAlgorithmException e) {
throw new IllegalStateException("Algorithm not supported. (developer error)", e);
} catch (InvalidKeySpecException e) {
throw new IllegalStateException("Invalid Key spec. (developer error)", e);
} catch (IOException e) {
throw new IllegalStateException("Cannot read private key file.", e);
}
}
private static byte[] decodePrivateKey(Resources resources, int privateKeyRawFileId) throws IOException {
try(InputStream inStream = resources.openRawResource(privateKeyRawFileId)) {
return Base64.decode(inputToString(inStream), Base64.DEFAULT);
}
}
private static String inputToString(InputStream is) {
java.util.Scanner s = new java.util.Scanner(is).useDelimiter("\\A");
return s.hasNext() ? s.next() : "";
}
private static String createJwtRsaPassword(String projectId, byte[] privateKeyBytes) throws NoSuchAlgorithmException, InvalidKeySpecException {
return createPassword(projectId, privateKeyBytes, "RSA", SignatureAlgorithm.RS256);
}
private static String createPassword(String projectId, byte[] privateKeyBytes, String algorithmName, SignatureAlgorithm signatureAlgorithm) throws NoSuchAlgorithmException, InvalidKeySpecException {
Instant now = Instant.now();
// Create a JWT to authenticate this device. The device will be disconnected after the token
// expires, and will have to reconnect with a new token. The audience field should always be set
// to the GCP project id.
JwtBuilder jwtBuilder =
Jwts.builder()
.setIssuedAt(Date.from(now))
.setExpiration(Date.from(now.plus(Duration.ofMinutes(20))))
.setAudience(projectId);
PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(privateKeyBytes);
KeyFactory kf = KeyFactory.getInstance(algorithmName);
return jwtBuilder.signWith(signatureAlgorithm, kf.generatePrivate(spec)).compact();
}
}
Класс MainActivity:
package cacaosd.com.sample1;
import android.app.Activity;
import android.hardware.SensorEvent;
import android.os.Bundle;
import android.os.HandlerThread;
import android.os.Handler;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.HandlerThread;
import android.util.Log;
import cacaosd.com.sample1.R;
import cacaosd.com.sample1.IotCoreCommunicator;
import com.google.android.things.pio.Gpio;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
public class MainActivity extends Activity {
private IotCoreCommunicator communicator;
private Handler handler;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Setup the communication with your Google IoT Core details
communicator = new IotCoreCommunicator.Builder()
.withContext(this)
.withCloudRegion("us-central1") // ex: europe-west1
.withProjectId("my-first-project-198704") // ex: supercoolproject23236
.withRegistryId("vibration") // ex: my-devices
.withDeviceId("my-device") // ex: my-test-raspberry-pi
.withPrivateKeyRawFileId(R.raw.rsa_private)
.build();
HandlerThread thread = new HandlerThread("MyBackgroundThread");
thread.start();
handler = new Handler(thread.getLooper());
handler.post(connectOffTheMainThread); // Use whatever threading mechanism you want
}
private final Runnable connectOffTheMainThread = new Runnable() {
@Override
public void run() {
communicator.connect();
handler.post(sendMqttMessage);
}
};
private final Runnable sendMqttMessage = new Runnable() {
private int i;
/**
* We post 100 messages as an example, 1 a second
*/
@Override
public void run() {
if (i == 100) {
return;
}
// events is the default topic for MQTT communication
String subtopic = "events";
// Your message you want to send
String message = "Hello World " + i++;
communicator.publishMessage(subtopic, message);
handler.postDelayed(this, TimeUnit.SECONDS.toMillis(1));
}
};
@Override
protected void onDestroy() {
communicator.disconnect();
super.onDestroy();
}
}
Обновление:
Я преобразовал закрытый ключ из формата "pem" в формат "pkcs8", следуя этой документации и этой демонстрации , затем ошибка "Invalid key spec" исчезла, но по-прежнему есть «FATAL EXCEPTION» и «java.lang.IllegalArgumentException: bad base-64», как показано на рисунке ниже:
[! [Введите описание изображения здесь] [4]] [4]
В нем говорится, что это связанные коды, вызвавшие ошибку (которая показана синим цветом на предыдущем изображении:
IotCorePasswordGenerator.java: 47
return Base64.decode(inputToString(inStream), Base64.DEFAULT);
IotCorePasswordGenerator.java: 34
byte[] privateKeyBytes = decodePrivateKey(resources, privateKeyRawFileId);
IotCoreCommunicator.java: 135
connectOptions.setPassword(passwordGenerator.createJwtRsaPassword());
IotCoreCommunicator.java: 101
clientConnect();
MainActivity.java: 58
communicator.connect();
Обновление 2
Я удалил утверждение "----- BEGIN PRIVATE KEY -----" и утверждение "------ END PRIVATE KEY -----", и ошибка "bad base 64" ушел, теперь есть еще одна ошибка, которая называется «сломанная труба», как показано на рисунке ниже, когда я снова открываю Android Studio и перестраиваю проект, эта ошибка удаляется «сломанная труба», и когда я снова запускаю проект, он возвращается снова.
Ошибка (первое изображение)
Закрытый ключ с инструкциями начала и конца (второе изображение)
Закрытый ключ без операторов начала и конца (третье изображение)
