环境准备和开发工具
- JDK：1.8+
MAVEN：3.1+ maven不要使用全局仓库配置，可能导致依赖无法下载
开发工具：idea
第一步 通过idea创建maven工程：demo-protocol
第二步 修改pom文件，添加依赖
```
// jetlinks 核心依赖 <dependency><groupId>org.jetlinks</groupId><artifactId>jetlinks-core</artifactId><version>1.0.2-BUILD-SNAPSHOT</version></dependency>// jetlinks 协议解析接口包<dependency><groupId>org.jetlinks</groupId><artifactId>jetlinks-supports</artifactId><version>1.0.2-BUILD-SNAPSHOT</version></dependency>// lombok，需要idea安装lombok插件，否则去掉<dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.10</version></dependency>// vertx核心包，可以用来进行网络模拟测试<dependency><groupId>io.vertx</groupId><artifactId>vertx-core</artifactId><version>3.8.3</version><scope>test</scope></dependency>// 单元测试包<dependency><groupId>org.junit.jupiter</groupId><artifactId>junit-jupiter</artifactId><version>5.5.2</version><scope>test</scope></dependency>// logback日志<dependency><groupId>ch.qos.logback</groupId><artifactId>logback-classic</artifactId><version>1.2.3</version></dependency>
// netty组件
io.netty netty-bom ${netty.version} pom import
- 修改maven pom文件properties
- 添加maven编译规则
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>${project.build.jdk}</source>
<target>${project.build.jdk}</target>
<encoding>${project.build.sourceEncoding}</encoding>
</configuration>
</plugin>
</plugins>
</build>
- 添加hsweb私服和阿里云仓库
<repositories>
<repository>
<id>hsweb-nexus</id>
<name>Nexus Release Repository</name>
<url>http://nexus.hsweb.me/content/groups/public/</url>
<snapshots>
<enabled>true</enabled>
<updatePolicy>always</updatePolicy>
</snapshots>
</repository>
<repository>
<id>aliyun-nexus</id>
<name>aliyun</name>
<url>http://maven.aliyun.com/nexus/content/groups/public/</url>
</repository>
</repositories>
## 第三步 协议开发
-
新建packag：org.jetlinks.demo.protocol
-
创建协议编码解码类：DemoDeviceMessageCodec
import io.netty.buffer.ByteBuf; import io.netty.buffer.ByteBufUtil; import io.netty.buffer.Unpooled; import lombok.AllArgsConstructor; import lombok.extern.slf4j.Slf4j; import org.apache.commons.codec.DecoderException; import org.apache.commons.codec.binary.Hex; import org.jetlinks.core.message.DeviceMessage; import org.jetlinks.core.message.DeviceOnlineMessage; import org.jetlinks.core.message.Message; import org.jetlinks.core.message.codec.*; import org.jetlinks.core.message.function.FunctionInvokeMessage; import org.jetlinks.core.message.function.FunctionInvokeMessageReply; import org.jetlinks.core.server.session.DeviceSession; import org.jetlinks.wt.protocol.message.NbIotMessage; import org.jetlinks.wt.protocol.message.data.enums.DataIdEnum; import org.jetlinks.wt.protocol.message.enums.ControlEnum; import org.reactivestreams.Publisher; import reactor.core.publisher.Flux; import reactor.core.publisher.Mono;
@AllArgsConstructor @Slf4j public class DemoDeviceMessageCodec implements DeviceMessageCodec { // 传输协议定义 @Override public Transport getSupportTransport() { return DefaultTransport.TCP; }
// 把tcp消息解码为平台消息，多用于设备上报消息到平台
@Override
public Mono<? extends Message> decode(MessageDecodeContext context) {
return Mono.empty();
}
// 把平台消息编码为协议传输消息，多用于平台命令下发到设备
@Override
public Publisher<? extends EncodedMessage> encode(MessageEncodeContext context) {
retrun Mono.empty();
}
}
- 创建协议入口类： DemoProtocolSupportProvider
import org.jetlinks.core.ProtocolSupport; import org.jetlinks.core.Value; import org.jetlinks.core.defaults.CompositeProtocolSupport; import org.jetlinks.core.device.AuthenticationResponse; import org.jetlinks.core.device.DeviceRegistry; import org.jetlinks.core.device.MqttAuthenticationRequest; import org.jetlinks.core.message.codec.DefaultTransport; import org.jetlinks.core.metadata.DefaultConfigMetadata; import org.jetlinks.core.metadata.types.PasswordType; import org.jetlinks.core.metadata.types.StringType; import org.jetlinks.core.spi.ProtocolSupportProvider; import org.jetlinks.core.spi.ServiceContext; import org.jetlinks.demo.protocol.tcp.DemoTcpMessageCodec; import org.jetlinks.supports.official.JetLinksDeviceMetadataCodec; import reactor.core.publisher.Mono;
public class DemoProtocolSupportProvider implements ProtocolSupportProvider {
@Override
public Mono<? extends ProtocolSupport> create(ServiceContext context) {
CompositeProtocolSupport support = new CompositeProtocolSupport();
// 协议ID
support.setId("demo-v1");
// 协议名称
support.setName("演示协议v1");
// 协议说明
support.setDescription("演示协议");
// 物模型编解码，固定为JetLinksDeviceMetadataCodec
support.setMetadataCodec(new JetLinksDeviceMetadataCodec());
//TCP消息编解码器
DemoDeviceMessageCodec codec = new DemoDeviceMessageCodec();
// 两个参数，协议支持和编解码类DemoDeviceMessageCodec中保持一致，第二个参数定义使用的编码解码类
support.addMessageCodecSupport(DefaultTransport.TCP, () -> Mono.just(codec));
return Mono.just(support);
}
}
## 第四步 设备上报消息解码
本部分代码全部写在DemoDeviceMessageCodec.decode方法中
@AllArgsConstructor @Slf4j public class DemoTcpMessageCodec implements DeviceMessageCodec {
….
// 把tcp消息解码为平台消息，多用于设备上报消息到平台
@Override
public Mono<? extends Message> decode(MessageDecodeContext context) {
return Mono.defer(() -> {
// 消息上下文
FromDeviceMessageContext ctx = ((FromDeviceMessageContext) context);
// 从上下文中获取消息字节数组
ByteBuf byteBuf = context.getMessage().getPayload();
byte[] payload = ByteBufUtil.getBytes(byteBuf, 0, byteBuf.readableBytes(), false);
// 把字节流转换为字符串，根据不同设备不同协议进行解析，
String text=new String(payload);
ReportPropertyMessage message.setProperties(properties); = new ReportPropertyMessage();
// 设置消息ID为我们获得的消息内容
message.setDeviceId(text);
// 以当前时间戳为消息时间
long time=LocalDateTime.now().toInstant(ZoneOffset.of("+8")).toEpochMilli();
message.setTimestamp(time);
// 构造上报属性
Map<String, Object> properties = new HashMap<>();
properties.put("text",text);
// 设置上报属性
message.setProperties(properties);
// 获取设备会话信息
DeviceSession session = ((FromDeviceMessageContext) context).getSession();
// 如果session中没有设备信息，则为设备首次上线
if (session.getOperator() == null) {
DeviceOnlineMessage onlineMessage = new DeviceOnlineMessage();
onlineMessage.setDeviceId(text);
onlineMessage.setTimestamp(System.currentTimeMillis());
// 返回到平台上线消息
return Flux.just(message,onlineMessage);
}
// 返回到平台属性上报消息
return Mono.just(message);
});
}
…..
}
## 第五步 平台发送消息到设备（消息编码）
本部分代码全部写在DemoDeviceMessageCodec.encode方法中
@AllArgsConstructor @Slf4j public class DemoDeviceMessageCodec implements DeviceMessageCodec { ………. // 把平台消息编码为协议传输消息，多用于平台命令下发到设备 @Override public Publisher<? extends EncodedMessage> encode(MessageEncodeContext context) { // 从平台消息上下文中获取消息内容 Message message = context.getMessage(); EncodedMessage encodedMessage=EncodedMessage.simple(Unpooled.wrappedBuffer(toBytes());) = null; // 根据消息类型的不同，构造不同的消息 if (message instanceof ReadPropertyMessage) { ReadPropertyMessage readPropertyMessage = (ReadPropertyMessage) message; // 获取需要传输的字节 byte[] bytes=readPropertyMessage.toString().getBytes(); // 构造为平台传输到设备的消息体 encodedMessage=EncodedMessage.simple(Unpooled.wrappedBuffer(bytes)); } … retrun encodedMessage != null ? Mono.just(encodedMessage) : Mono.empty(); } }
```
第六步 打成jar包上传到平台，并进行调试
以TCP服务网关接入设备为例。
进行协议上传和 配置，并使用TCP工具进行调试。
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