Microgear-csharp

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microgear-csharp is a client library for C# 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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Install-Package Microgear

Usage Example

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using System.Threading;
using io.netpie.microgear;

namespace ConsoleApplication1
{
    class Program
    {
        private static String AppID = <appid>;
        private static String Key = <key>;
        private static String Secret =  <secret>;
        private static Microgear microgear;
        static void Main(string[] args)
        {
            microgear = new Microgear();
            microgear.onConnect += Connect;
            microgear.onMessage += Message;
            microgear.onAbsent += Absent;
            microgear.onPresent += Present;
            microgear.onError += Error;
            microgear.onInfo += Info;
            microgear.Connect(AppID, Key, Secret);
            microgear.SetAlias("test");
            microgear.Subscribe("/topic");
            for (int i = 0; i < 10; i++)
            {
                microgear.Chat("test", "test message no."+i.ToString());
                Thread.Sleep(2000);
            }
        }

        public static void Connect()
        {
            Console.WriteLine("Now I'm connecting with NETPIE");
        }

        public static void Message(string topic,string message)
        {
            Console.WriteLine(topic + " " + message);
        }

        public static void Present(string token)
        {
            Console.WriteLine(token);
        }

        public static void Absent(string token)
        {
            Console.WriteLine(token);
        }

        public static void Error(string error)
        {
            Console.WriteLine(error);
        }

        public static void Info(string info)
        {
            Console.WriteLine(info);
        }
    }
}

Library Usage

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Microgear

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Connect(AppID, Key, Secret)

arguments

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

SetAlias(alias): 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 .

argument

• alias string - name of this microgear

Chat(gearname, message): sending a message to a specified gearname

arguments

• gearname string - name of microgear to which to send a message.
• message string - message to be sent.

Publish(topic, message, retain): 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.
• retain boolean - retain a message or not (the default is False) If True, the message is kept. To remove the retained message, publish an empty message or "" which is a message with length 0.

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.

argument

• topic string - name of the topic to send a message to. Should start with "/".

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

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

arguments

• Feedid string - name of the feed
• Data string – data string
• 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

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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:

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

Parameter set

• callback function - A function to execute after getting connected

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

Parameter set

• callback function - A function to execute after getting disconnected

onMessage When there is an incomming message from chat or from subscribed topic. This event is created with the related information to be sent via the callback function.

Parameter set

• callback function - A function to execute after getting a message. It takes 2 arguments.
  • topic - The subscribed topic that he message belongs to.
  • message - The received message.

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

Parameter set

• callback function - A function to executed after this event. It takes 1 argument.
  • gearkey - The gearkey related to this event.

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

Parameter set

• callback function - A function to executed after this event. It takes 1 argument.
  • gearkey - The gearkey related to this event.

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

Parameter set

• callback function - A function to executed after this event. It takes 1 argument.
  • msg - An error message related to this event.

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

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• callback function - A function to executed after this event. It takes 1 argument.
  • msg - An info message related to this event