Microgear-java

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microgear-java is a client library for Java The library is used to connect application code or hardware with the NETPIE Platform's service for developing IoT applications. For more details on the NETPIE Platform, please visit https://netpie.io

Installation

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Refer to the latest version directly from the Maven like this

<dependency>
	<groupId>io.netpie</groupId>
	<artifactId>microgear</artifactId>
	<version>1.1.0</version>
</dependency>

Usage Example

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import io.netpie.microgear.Microgear;
import io.netpie.microgear.MicrogearEventListener;

public class Example {
	final static String appID = "appID";
	final static String Key = "Key";
	final static String Secret = "Secret";
	static Microgear microgear;
	static callback callback;


	public static void main(String[] args) throws InterruptedException {
		microgear = new Microgear();
		callback = new callback();
		microgear.SetCallback(callback);
		microgear.Connect(appID, Key, Secret);
		microgear.Subscribe("/Topic");
		int count = 1;
		for(;;){
			microgear.Publish("/Topic", String.valueOf(count)+".  Test message");
			count++;
			Thread.sleep(2000);
		}
	}

	static class callback implements MicrogearEventListener{

		@Override
		public void onConnect() {
			// TODO Auto-generated method stub
			System.out.println("Microgear is Connected.");
			//this.microgear.Publish("/chat", "Hello world#pppppp#qqqqq");
		}

		@Override
		public void onMessage(String topic, String message) {
			// TODO Auto-generated method stub
			System.out.println(topic+" "+message);
		}

		@Override
		public void onPresent(String token) {
			// TODO Auto-generated method stub
			System.out.println("Present "+token);
		}

		@Override
		public void onAbsent(String token) {
			// TODO Auto-generated method stub
			System.out.println("Absent "+token);
		}

		@Override
		public void onDisconnect() {
			// TODO Auto-generated method stub
			System.out.println("Microgear is Disconnect.");
		}

		@Override
		public void onError(String error) {
			// TODO Auto-generated method stub
			System.out.println("Error "+error);
		}
	}
}

Library Usage

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Microgear

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Create&Connect

Connect(appID, Key, Secret);

arguments

• appID string - a group of application that microgear will connect to.
• Key string - is used as a microgear identity.
• Secret string - comes in a pair with gearkey. The secret is used for authentication and integrity.

SetCallback

SetCallback(Callback);

arguments

• Callback MicrogearEventListener - event class.

SetAlias

SetAlias(Newalias) microgear can set its own alias, which to be used for others make a function call chat(). The alias will appear on the key management portal of netpie.io

arguments

• Newalias string – name of this microgear.

Chat

Chat(Name, Message);

arguments

• Name string - name of microgear to which to send a message.
• Message string – message to be sent.

Publish

Publish(Topic, Message, Retained); In the case that the microgear want to send a message to an unspecified receiver, the developer can use the function publish to the desired topic, which all the microgears that subscribe such topic will receive a message.

arguments

• Topic string - name of topic to be send a message to.
• Message string – message to be sent.
• Retained Boolean - retain a message or not (the default is false)

Subscribe

Subscribe(Topic); microgear may be interested in some topic. The developer can use the function subscribe() to subscribe a message belong to such topic. If the topic used to retain a message, the microgear will receive a message everytime it subscribes that topic.

arguments

• Topic string - name of the topic to send a message to.

Unsubscribe

Unsubscribe(Topic); cancel subscription

arguments

• Topic string - name of the topic to send a message to.

Disconnect

Disconnect(); cancel connect

Resettoken

resettoken(); For deleting Token in cache and on the platform. If deleted, need to get a new Token for the next connection.

WriteFeed

wrtieFeed(Feedid, Data, Apikey): write time series data to a feed storage

arguments

• Feedid string - name of the feed
• Data jsonobject – data JSONObject
• Apikey string - apikey for authorization. If apikey is not specified, you will need to allow the AppID to access feed and then the default apikey will be assigned automatically.

### Event ----------- An application that runs on a microgear is an event-driven type, which responses to various events with the callback function in a form of event function call

Event connect

This event is created when the microgear library successfully connects to the NETPIE platform.

@Override
public void onConnect() {
	// TODO Auto-generated method stub
	System.out.println("Microgear is Connected.");
	//this.microgear.Publish("/chat", "Hello world#pppppp#qqqqq");
}

Event message

When there is an incomming message, this event is created with the related information to be sent via the callback function.

@Override
public void onMessage(String Topic, String Message) {
	// TODO Auto-generated method stub
	System.out.println(Topic+" "+Message);
}

arguments

• Topic string - topic of message
• Message string - message received

Event present

This event is created when there is a microgear under the same appid appears online to connect to NETPIE.

@Override
public void onPresent(String Name) {
	// TODO Auto-generated method stub
	System.out.println("Present "+Name);
}

arguments

• Name string - Name of microgear under the same appid appears online

Event absent

This event is created when the microgear under the same appid appears offline.

@Override
public void onAbsent(String Name) {
	// TODO Auto-generated method stub
	System.out.println("Absent "+Name);
}

arguments

• Name string - Name of microgear under the same appid appears offline

Event disconnect

This event is created when the microgear library disconnects the NETPIE platform.

@Override
public void onDisconnect() {
	// TODO Auto-generated method stub
	System.out.println("Microgear is Disconnect.");
}

Event error

This event is created when an error occurs within a microgear.

@Override
public void onError(String error) {
	// TODO Auto-generated method stub
	System.out.println("Error "+error);
}

arguments

• error string - Log error message

Event info

This event is created when an info occurs within a microgear.

@Override
public void onInfo(String info) {
	// TODO Auto-generated method stub
	System.out.println("Info "+info);
}

arguments

• info string - Log info message