# Fieldbus Access runtime

## Service management

Fieldbus Access runs as a service and the management is different depending on the system it runs on.

### CC Linux 4

The runtime starts as a service and can be controlled by `systemctl`. Use either `enable` or `disable` to control if Fieldbus Access should autostart or not:

    sudo systemctl enable fieldbusaccess
    sudo systemctl disable fieldbusaccess

The service may also be started or stopped while the system is running:

    sudo systemctl start fieldbusaccess
    sudo systemctl stop fieldbusaccess

Output from the service can be checked with `journalctl`:

    sudo journalctl -fu fieldbusaccess

## Startup arguments

    $/appfs/bin/fieldbusaccess --help
    Usage: ./fieldbusaccess [options] config
    Transfer configured signals between CAN-bus and Application through Data Engine

    Options:
      -h, --help          Displays help on commandline options.
      -v, --version       Displays version information.
      --name <Name>       Instance name of FA to use [Default: FieldbusAccess]
      -d, --debug <level> Additional debug output. Select level: 1=Debug,
                          2=Warning, 3=Critical, 4=Fatal.
      -ip <ip-address>    IP Address to DE [Default: 127.0.0.1]

    Arguments:
      config              Path and name of configuration file to use.

### -h, –help

Display the help information.

### -v, –version

Display version information about Fieldbus Access.

### –name <Name>

Instance name of Fieldbus Access. Default if none is selected, ‘fieldbusAccess’

### -d, –debug <level>

Activate additional printouts during execution. Number selects level to print to file. Logfiles are found on the device at `/data/home/ccs/FieldbusAccess/logs/debug_log.txt` and `/opt/FieldbusAccess/logs/debug_log.txt` on the vm. Argument level and higher will be added to the log. If you add `-d 2 (Warning)` as argument, Warnings, Critical and Fatal errors will be added to the logfile.

Level | Error | Description
--- | --- | ---
1 | Debug | Information that is diagnostically helpful
2 | Warning | Anything that can potentially cause runtime oddities but are automatically recovering
3 | Critical | Any error which is critical to the operation. These errors will usually force user intervention
4 | Fatal | Any error that is forcing a shutdown of the runtime

### -ip <ip-address>

IP Address to connect to Data Engine. Default is ‘localhost’ 127.0.0.1.

### config

Nonoptional argument. Configuration file (.json) created by LinX Manager Fieldbus Access

## Example

    fieldbusaccess [options] configuration
    $/appfs/bin/fieldbusaccess --debug 2 FieldbusAccess_ConfigFile.json
    Will add `Warning, Critical and Fatal` messages in /data/home/ccs/FieldbusAccess/logs/debug_log.txt