//
//  Licensed to the Apache Software Foundation (ASF) under one or more
//  contributor license agreements.  See the NOTICE file distributed with
//  this work for additional information regarding copyright ownership.
//  The ASF licenses this file to You under the Apache License, Version 2.0
//  (the "License"); you may not use this file except in compliance with
//  the License.  You may obtain a copy of the License at
//
//      https://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
//
:imagesdir: ../../images/
:icons: font

= SocketCAN



[cols="2,2a,5a"]
|===
|Name |Value |Description

|Code
2+|`socketcan`

|Name
2+|SocketCAN (software bridge to CAN).

|Maven Dependency
2+|
[subs=attributes+]
----
<dependency>
  <groupId>org.apache.plc4x</groupId>
  <artifactId>plc4j-transport-socketcan</artifactId>
  <version>{current-last-released-version}</version>
</dependency>
----

|Transport Syntax:
|
----
{name of the socketcan interface}
----
|Can differ depending on the OS:

- can0
- vcan0

|Options:
2+|*none*
|===

SocketCAN is linux specific way to access CAN bus.
It has its own representation of CAN frames, buffers and so on.
This means that you have to program your application against socketcan and not raw can interfaces.

Primary difference is fixed length of socketcan frames (CAN 2.0A always takes 16 bytes) and extended size of CAN identifier.
Standard CAN frame uses 11 bits while socketcan uses 29 and appends flags to remaining 3 bits.

Use of socketcan means that Apache PLC4X does not handle low level bus access, arbitration, coordination and so on.
This is done by socketcan and layer below it.

This transport have been successfully tested with `vcan` as well as `gs_usb` drivers.