Improved documentation: added variables for copy and paste solution

1 files changed, 17 insertions, 10 deletions

diff --git a/documents/examples/AVB_Talker_Listener_Example_Setup.md b/documents/examples/AVB_Talker_Listener_Example_Setup.md
index 79deb96b..293eb686 100644
--- a/documents/examples/AVB_Talker_Listener_Example_Setup.md
+++ b/documents/examples/AVB_Talker_Listener_Example_Setup.md
@@ -2,18 +2,25 @@
 
 _Note:_ this tutorial targets a Linux OS.
 
-Fetch the Open-AVB repository. To ease the further steps, enter your local copy and export its path via
+## Preparation
+
+Fetch the Open-AVB repository. To ease the further steps, enter your local copy
+and export its path and AVB interfaces via
 ```bash
 export AVB_PATH=$(pwd)
+export AVB_PC1_IF="eth0"
+export AVB_PC2_IF="eth2"
 ```
-Then, you can use a terminal multiplexer like _byobu_ to start all needed AVB tools in different windows.
+Then, you can use a terminal multiplexer like _byobu_ to start all needed AVB
+tools in different windows.
 
 We assume the following PC setup:
   * PC1: ethernet eth0 for AVB connection
   * PC2: ethernet eth2 for AVB connection
   * Both ethernet cards are using the `igb_avb` driver.
-    Check via `ethtool -i eth0`.
-    If not, launch `sudo ./startup.sh eth0` in `kmod/igb` to load the required driver for the provided interface.
+    * Check via `ethtool -i eth0`.
+    * If not, launch `sudo ./startup.sh eth0` in `kmod/igb` to load the required
+      driver for the AVB interface.
   * Both PCs can ping each other through the AVB network cards.
 
 ## PC 1: start AVB environment + talker application
@@ -23,18 +30,18 @@ Start AVB environment:
 ```bash
 # GPTP time synchronization daemon
 cd "${AVB_PATH}/daemons/gptp/linux/build/obj"
-sudo ./daemon_cl eth0 -R 1
+sudo ./daemon_cl $AVB_PC1_IF -R 1
 
 # Stream reservation daemon (m: MMRP, v: MVRP, s: MSRP)
 cd "${AVB_PATH}/daemons/mrpd"
-sudo ./mrpd -mvs -i eth0
+sudo ./mrpd -mvs -i $AVB_PC1_IF
 ```
 
 Start AVB talker example:
 
 ```bash
 cd "${AVB_PATH}/examples/simple_talker"
-sudo ./simple_talker -i eth0 -t 2
+sudo ./simple_talker -i $AVB_PC1_IF -t 2
 ```
 
 ## PC 2: start AVB environment + listener application
@@ -44,18 +51,18 @@ Start AVB environment similar to PC 1:
 ```bash
 # GPTP time synchronization daemon (will synchronize on PC 1)
 cd "${AVB_PATH}/daemons/gptp/linux/build/obj"
-sudo ./daemon_cl eth2
+sudo ./daemon_cl $AVB_PC2_IF
 
 # Stream reservation daemon (m: MMRP, v: MVRP, s: MSRP)
 cd "${AVB_PATH}/daemons/mrpd"
-sudo ./mrpd -mvs -i eth2
+sudo ./mrpd -mvs -i $AVB_PC2_IF
 ```
 
 Start AVB listener example:
 
 ```bash
 cd "${AVB_PATH}/examples/simple_listener"
-sudo ./simple_listener -i eth2 -f out.wav
+sudo ./simple_listener -i $AVB_PC2_IF -f out.wav
 ```
 
 :tada: