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Remove EXTRA_JAVA_OPTS for serial devices (#1295) 

This is no longer required and has been removed from openHABian some time ago already.

On a sidenote, we need a tutorial for migrations to OH3. At least a major overhaul of this page with an OH3 section / diffs.

Signed-off-by: Markus Storm <markus.storm@gmx.net>
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Markus Storm 2020-11-28 23:12:14 +01:00 committed by GitHub
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@ -645,7 +645,7 @@ With openHAB 2 you can also [use the openHAB console]({{base}}/administration/lo
## Recommended Additional Setup Steps
The following is not directly related to the openHAB installation but rather recommended on a openHAB system.
The following is not directly related to the openHAB installation but rather recommended on an openHAB system.
The need for these and the exact implementation on a specific system might differ from user to user.
### Privileges for Common Peripherals
@ -667,21 +667,11 @@ If you are looking to enable sound privileges for openHAB, it will also be neces
sudo adduser openhab audio
```
Additionally it's needed to allow the java environment to access the serial port of the connected peripheral.
Therefore the following setting has to be added/adapted on your system in file `/etc/default/openhab2`:
```shell
EXTRA_JAVA_OPTS="-Dgnu.io.rxtx.SerialPorts=/dev/ttyUSB0:/dev/ttyS0:/dev/ttyS2:/dev/ttyACM0:/dev/ttyAMA0"
```
The shown device handlers are just the most common examples.
Please contact the community forum for more detailed information regarding individual hardware.
### Java Network Permissions
The Java Virtual Machine hosting openHAB is restricted in its permissions to interact on network level for security reasons.
Some openHAB add-ons, like the Network or AmazonDash bindings, need elevated permissions to work.
If needed, grand these permissions by executing the following command:
Some openHAB add-ons like the network binding need elevated permissions to work.
If needed, grant these permissions by executing the following command:
```shell
setcap 'cap_net_raw,cap_net_admin=+eip cap_net_bind_service=+ep' $(realpath /usr/bin/java)