GatewayCallback (IBM Watson IoT SDK 0.2.1 API)

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Summary:
Nested |
Field |
Constr |
Method

Detail:
Field |
Constr |
Method

```
public interface GatewayCallback<T>
```
A callback interface that needs to be implemented by the Gateway to handle the commands or notifications from IBM Watson IoT Platform.

Gateway can subscribe to commands directed at the gateway itself and to any device connected via the gateway. To process specific commands, the Gateway needs to register a command callback method. Once the Command callback is added to the GatewayClient, the processCommand(com.ibm.wiotp.sdk.gateway.Command) method is invoked whenever any command is published on the subscribed criteria.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`void`	`processCommand(Command<T> cmd)` Method to be called by the `GatewayClient` when any command is published on the subscribed criteria.
`void`	`processNotification(Notification notification)` If a gateways subscribes to a topic of a device or sends data on behalf of a device where the gateway does not have permission for, the message or the subscription is being ignored.

- Method Detail
  - processCommand
```
void processCommand(Command<T> cmd)
```
    Method to be called by the GatewayClient when any command is published on the subscribed criteria.
    
    Parameters:
    
    cmd - an instance of Command.
  - processNotification
```
void processNotification(Notification notification)
```
    If a gateways subscribes to a topic of a device or sends data on behalf of a device where the gateway does not have permission for, the message or the subscription is being ignored. This behavior is different compared to applications where the connection will be terminated. The Gateway will be notified on the notification topic:.
    - iot-2/type/+/id/+/notify
    Parameters:
    
    notification - Notification from the Watson IoT Platform that needs to be processed.