Component: Tunnel
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This component is provided by the [[item:linked_card|linked card]].

This card is similar to the [[component:modem|network card's component]], but as it is only point-to-point, no ports can be configured, and the connection is always open.

Component name: `tunnel`.  
Callbacks:

- `send(data...)`  
  Sends the specified data to the card this one is linked to.
- `maxPacketSize():number`  
  Gets the maximum packet size (config setting).
- `getChannel():string`  
  Gets the tunnel address of the link card. This is also available in `linkChannel` using an inventory controller and getting the stack from an inventory slot.
- `getWakeMessage():string`  
  Gets the current wake-up message. When the network card detects the wake message (a string in the first argument of a network packet), on any port and the machine is off, the machine is started. This is the same functionality also provided by robots, cases, servers, drones, and tablets.
- `setWakeMessage(message: string, [fuzzy: boolean]):string`  
  Sets the wake-up message to the specified **string**. The message matching can be fuzzy (default is false). A fuzzy match ignores additional trailing arguments in the network packet.

This card generates `modem_message` signals of the same format network cards do.

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