XpaInterface (JMRI API)

All Known Implementing Classes:

XpaTrafficController
```
public interface XpaInterface
```
Define interface for sending and receiving messages from an XpressNet System using an XPA and a modem.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`addXpaListener(XpaListener l)`
`void`	`removeXpaListener(XpaListener l)`
`void`	`sendXpaMessage(XpaMessage m, XpaListener l)`	Send a message through the interface.
`boolean`	`status()`	Test operational status of interface.

- Method Detail
  - addXpaListener
```
void addXpaListener(XpaListener l)
```
  - removeXpaListener
```
void removeXpaListener(XpaListener l)
```
  - status
```
boolean status()
```
    Test operational status of interface.
    
    Returns:
    
    true if the interface implementation is operational.
  - sendXpaMessage
```
void sendXpaMessage(XpaMessage m,
                    XpaListener l)
```
    Send a message through the interface.
    
    Parameters:
    
    m - Message to be sent.
    
    l - Listener to be notified of reply.