Added default value for backbone interface

Author: osaether

README.md

@@ -32,5 +32,5 @@ The command line options with default values are shown in the following table.
 | NAT64 Prefix         |  --nat64-prefix                 | 64:ff9b::/96                     |
 | Default prefix route |  --disable-default-prefix-route | Enabled                          |
 | Default prefix slaac |  --disable-default-prefix-slaac | Enabled                          |
-| Backbone Interface   |  --backbone-interface           |                                  |
+| Backbone Interface   |  --backbone-interface           | eth0                             |
 | MQTT Broker          |  --broker                       | mqtt.eclipseprojects.io          |

docker_entrypoint.sh

@@ -45,7 +45,7 @@ function parse_args()
             shift
             ;;
         --backbone-interface | -B)
-            BACKBONE_INTERFACE_ARG="-B $2"
+            BACKBONE_INTERFACE=$2
             shift
             shift
             ;;
@@ -110,6 +110,7 @@ parse_args "$@"
 
 [ -n "$RADIO_URL" ] || RADIO_URL="spinel+hdlc+uart:///dev/ttyACM0"
 [ -n "$TUN_INTERFACE_NAME" ] || TUN_INTERFACE_NAME="wpan0"
+[ -n "$BACKBONE_INTERFACE" ] || BACKBONE_INTERFACE="eth0"
 [ -n "$AUTO_PREFIX_ROUTE" ] || AUTO_PREFIX_ROUTE=true
 [ -n "$AUTO_PREFIX_SLAAC" ] || AUTO_PREFIX_SLAAC=true
 [ -n "$NAT64_PREFIX" ] || NAT64_PREFIX="64:ff9b::/96"
@@ -125,7 +126,7 @@ parse_args "$@"
 
 echo "RADIO_URL:" $RADIO_URL
 echo "TUN_INTERFACE_NAME:" $TUN_INTERFACE_NAME
-echo "BACKBONE_INTERFACE: $BACKBONE_INTERFACE_ARG"
+echo "BACKBONE_INTERFACE:" $BACKBONE_INTERFACE
 echo "NAT64_PREFIX:" $NAT64_PREFIX
 echo "AUTO_PREFIX_ROUTE:" $AUTO_PREFIX_ROUTE
 echo "AUTO_PREFIX_SLAAC:" $AUTO_PREFIX_SLAAC
@@ -139,7 +140,7 @@ sed -i "s/^BrokerName=.*$/BrokerName=$BROKER_NAME/" /app/gateway.conf
 sed -i "s/^GatewayUDP6Hops=.*$/GatewayUDP6Hops=64/" /app/gateway.conf
 sed -i "s/^GatewayUDP6Port=.*$/GatewayUDP6Port=47193/" /app/gateway.conf
 
-echo "OTBR_AGENT_OPTS=\"-I $TUN_INTERFACE_NAME $BACKBONE_INTERFACE_ARG -d7 $RADIO_URL\"" >/etc/default/otbr-agent
+echo "OTBR_AGENT_OPTS=\"-I $TUN_INTERFACE_NAME -B $BACKBONE_INTERFACE -d7 $RADIO_URL\"" >/etc/default/otbr-agent
 echo "OTBR_WEB_OPTS=\"-I $TUN_INTERFACE_NAME -d7 -p 80\"" >/etc/default/otbr-web
 
 echo "net.ipv6.conf.all.disable_ipv6=0" >> /etc/sysctl.conf