Doc: update installation of NodeJS, add paths for NMEA sample files + cosmetics

docs/src/installation/raspberry_pi_installation.md

@@ -28,18 +28,16 @@ Once the OS installation has been completed, you are ready to commence.
 
 1. Update the list of install packages.
     ```
-    $ sudo apt update
+    sudo apt update
     ```
 
-1. Install NodeJS and npm.
-    ```
-    $ curl -sL https://deb.nodesource.com/setup_18.x | sudo -E bash -
-    $ sudo apt-get install -y nodejs
-    ```
+1. Install NodeJS 18 and npm.
+
+    Follow [instructions for Ubuntu and Debian based distributions like Raspberry Pi OS at NodeSource Distributions](https://github.com/nodesource/distributions#installation-instructions).
 
 1. Ensure that we're using the latest version of npm.
     ```
-    $ sudo npm install -g npm@latest
+    sudo npm install -g npm@latest
     ```
 
     Use the following command to check the versions of NodeJS and npm installed.
@@ -51,25 +49,25 @@ Once the OS installation has been completed, you are ready to commence.
 
 1. Install a Bonjour (mDNS) service for Linux called Avahi, which allows Apps and other network devices to Discover the Signal K server.
     ```
-    $ sudo apt install libnss-mdns avahi-utils libavahi-compat-libdnssd-dev
+    sudo apt install libnss-mdns avahi-utils libavahi-compat-libdnssd-dev
     ```
 
 ## Install Signal K Server
 
 ```
-$ sudo npm install -g signalk-server
+sudo npm install -g signalk-server
 ```
 
 You can test that installation was successful by starting the server using some 
 sample data.
 
 ```
-$ signalk-server --sample-nmea0183-data
+signalk-server --sample-nmea0183-data
 ```
 
 You should see the terminal output "signalk-server running at 0.0.0.0:3000" as shown below...
 ``` 
-$ signalk-server --sample-nmea0183-data
+signalk-server --sample-nmea0183-data
 Using sample data from /usr/lib/node_modules/signalk-server/samples/plaka.log
 signalk-server running at 0.0.0.0:3000
 ```
@@ -101,7 +99,7 @@ Now that you have Signal K server installed, you will want to generate a setting
 and configure your RPi to start the server automatically. To do this run the setup script by entering the  following command and follow the prompts.
 
 ```
-$ sudo signalk-server-setup
+sudo signalk-server-setup
 ```
 
 You can re-run this command at any time in the future to change the settings.
@@ -114,20 +112,20 @@ Signal K server will now be started automatically when your RPi boots up.
 
 If you want to temporarily stop the Signal K server, you can do so by entering the following commands:
 ```
-$ sudo systemctl stop signalk.service
-$ sudo systemctl stop signalk.socket
+sudo systemctl stop signalk.service
+sudo systemctl stop signalk.socket
 ```
 
 To start Signal K server again enter the following commands:
 ```
-$ sudo systemctl start signalk.service
-$ sudo systemctl start signalk.socket
+sudo systemctl start signalk.service
+sudo systemctl start signalk.socket
 ```
 
 To stop Signal K server from starting automatically enter the following commands:
 ```
-$ sudo systemctl disable signalk.service
-$ sudo systemctl disable signalk.socket
+sudo systemctl disable signalk.service
+sudo systemctl disable signalk.socket
 ```
 
 

docs/src/setup/configuration.md

@@ -42,10 +42,26 @@ The options presented will vary based on the data type chosen.
 
 Please refer to the [Canboat PGN database](https://canboat.github.io/canboat/canboat.html) to see what PGNs are supported.
 
-
 **_NMEA0183_**: The processing of NMEA0183 sentences is done by [nmea0183-signalk](https://github.com/SignalK/signalk-parser-nmea0183)
 
+**Connection type "File Stream"**
+
+Sample files are available which can be set up as input for the server.
+
+Use below command to get the path to a NMEA 2000 file with navigation data and AIS targets.
+
+```
+sudo find / -name "aava-n2k.data"
+```
+Set up according to picture.
+
+![SK_N2K_file](./SK_file_stream_N2K.png)
+
+To get the path for the sample file, data type NMEA 0183, use below command.
 
+```
+sudo find / -name "plaka.log"
+```
 ### Install Plugins and Webapps
 
 Signal K server functionality can be extended through the use of plugins and webapps.