Working ok with a single xbnet, file structure and code encapsulation looking good, iptable updating ok, need to figure out issues with bridge network

.env

@@ -1,11 +1,14 @@
 # Configuration for xbnet0
 XBEE0_PORT=/dev/ttyUSB0
-XBEE0_BAUDRATE=/dev/ttyUSB0
-XBEE0_NET_SRC_IP=192.168.8.1
-XBEE0_NET_DST_IP=192.168.8.2
+XBEE0_BAUDRATE=230400
+XBEE0_NET_SRC_IP=192.168.1.10   # Note: This requires the subnet 192.168.1... (to match with the default gateway, or use Masquerade if changing the subnet)
+XBEE0_NET_DST_IP=192.168.1.11   # Note: This requires the subnet 192.168.1... (to match with the default gateway, or use Masquerade if changing the subnet)
+XBEE0_NET_IFACE_NAME=xbnet0
 
 # Configuration for xbnet1
 XBEE1_PORT=/dev/ttyUSB1
-XBEE1_BAUDRATE=/dev/ttyUSB1
-XBEE1_NET_SRC_IP=192.168.8.2
-XBEE1_NET_DST_IP=192.168.8.1
+XBEE1_BAUDRATE=230400
+XBEE1_NET_SRC_IP=192.168.1.11   # Note: This requires the subnet 192.168.1... (to match with the default gateway, or use Masquerade if changing the subnet)
+XBEE1_NET_DST_IP=192.168.1.10   # Note: This requires the subnet 192.168.1... (to match with the default gateway, or use Masquerade if changing the subnet)
+XBEE1_NET_IFACE_NAME=xbnet1
+

Dockerfile

@@ -1,11 +1,15 @@
 # Use an official Rust image as the base
 FROM rust:latest
 
-# Install dependencies
+# Install necessary packages
 RUN apt-get update && apt-get install -y \
     libudev-dev \
     iproute2 \
     iputils-ping \
+    net-tools \
+    bridge-utils \
+    iptables \
+    supervisor \
     && rm -rf /var/lib/apt/lists/*
 
 # Clone the xbnet repository
@@ -13,14 +17,24 @@ RUN git clone https://github.com/jgoerzen/xbnet.git /usr/src/xbnet
 
 # Build xbnet
 WORKDIR /usr/src/xbnet
-RUN cargo build && cargo build --release
+RUN cargo build --release
 
-# Copy the built binary to /usr/local/bin
+# Copy the built binary to /usr/local/bin (makes it accessible from anywhere in the OS)
 RUN cp target/release/xbnet /usr/local/bin/xbnet
 
-# Create and copy the entrypoint script to root location "/"
-COPY ./entrypoint.sh /
+# Copy the entrypoint script
+COPY entrypoint.sh /entrypoint.sh
 RUN chmod +x /entrypoint.sh
 
-ENTRYPOINT ["/entrypoint.sh"]
-CMD ["bash"]
+# Copy the supervisor config file
+COPY supervisord.conf /etc/supervisor/conf.d/supervisord.conf
+
+# Copy the health check script from local ./scripts/ to container root /
+COPY ./scripts/health_check.sh /health_check.sh
+RUN chmod +x /health_check.sh
+
+# Add the health check
+HEALTHCHECK CMD /health_check.sh || exit 1
+
+# Start supervisord as the main command
+CMD ["/usr/bin/supervisord", "-c", "/etc/supervisor/conf.d/supervisord.conf"]

docker-compose-run-multiple.yml

@@ -1,3 +1,7 @@
+# TODO: This will not work with current configuration
+# Use a bash script to either dynamicall generate this file or append to services
+#   based on how many xbnets you want to create
+
 version: '3.8'
 
 services:

docker-compose.yml

@@ -5,15 +5,15 @@ services:
     build: .
     container_name: xbee_node
     privileged: true
-    env_file:
-      - .env
-    devices:
-      - "${XBEE0_PORT}:${XBEE0_PORT}"
-    command: >
-      bash -c "
-        xbnet -d --serial-speed ${XBEE0_BAUDRATE} ${XBEE0_PORT} tun;
-        ip addr add ${XBEE1_NET_SRC_IP}/24 dev xbnet0;
-        ip link set dev xbnet0 up;
-        ping -c 4 ${XBEE1_NET_DST_IP};
-        sleep infinity
-      "
+    env_file: .env 
+    restart: always  
+    networks:
+      default:
+        ipv4_address: ${XBEE0_NET_SRC_IP}
+
+networks:
+  default:
+    driver: bridge
+    ipam:
+      config:
+        - subnet: 192.168.1.0/24  # Note: the xbnet assigned IPs must be on this subnet (if Masquerade is not used)

entrypoint.sh

@@ -1,4 +1,142 @@
 #!/bin/bash
 
-set -e
-exec "$@"
+# Source the get_connected_wifi_info.sh script
+source ./scripts/get_connected_wifi_info.sh
+
+# Check if the script is running with root privileges
+check_root() {
+    if [ "$(id -u)" -ne 0 ]; then
+        echo "This script must be run as root. Exiting..."
+        exit 1
+    fi
+}
+
+# Clean up resources
+#   - Kill the background process used to create the xbnet interface
+#   - Cleanup any resources created or copied over. This includes:
+#       - Bridge interface
+#       - xbnet interface
+cleanup() {
+    echo "Cleaning up resources..."
+    pkill -f "xbnet -d --serial-speed $XBEE0_BAUDRATE $XBEE0_PORT tap"
+
+    if ip link show br0 > /dev/null 2>&1; then
+        ip link set br0 down
+        brctl delbr br0
+    fi
+
+    if ip link show $XBEE0_NET_IFACE_NAME > /dev/null 2>&1; then
+        ip link set $XBEE0_NET_IFACE_NAME down
+        ip link delete $XBEE0_NET_IFACE_NAME
+    fi
+}
+
+# Function to check if the XBee device is connected
+check_xbee_device() {
+    if [ -e "$XBEE0_PORT" ]; then
+        echo "XBee device found at $XBEE0_PORT. Proceeding with setup..."
+        return 0
+    else
+        echo "Error: No XBee device found at $XBEE0_PORT. Please connect the device."
+        return 1
+    fi
+}
+
+# Start the xbnet interface
+#   - Also check if the starting the xbnet interface was successful 
+#       - And return appropriate status codes
+start_xbnet_interface() {
+    echo "Starting XBee network interface..."
+    xbnet -d --serial-speed $XBEE0_BAUDRATE $XBEE0_PORT tap &
+
+    while [ ! -d "/sys/class/net/$XBEE0_NET_IFACE_NAME" ]; do
+        echo "Waiting for interface $XBEE0_NET_IFACE_NAME to be created..."
+        sleep 1
+    done
+
+    XBEE0_NET_IFACE_NAME=$(ls /sys/class/net | grep 'xbnet')
+
+    if [ -z "$XBEE0_NET_IFACE_NAME" ]; then
+        echo "Error: No XBee network interface found."
+        return 1
+    else
+        echo "XBee network interface $XBEE0_NET_IFACE_NAME created successfully."
+        return 0
+    fi
+}
+
+# Configure the network interface and bridge
+#   - Create interface with name specified by XBEE0_NET_IFACE_NAME in .env file
+#   - Create bridge interface (this bridge will be used to connect xbnet to host wifi)
+#   - Attach xbnet to bridge
+#   - Start the bridge interface 
+configure_network_and_bridge() {
+    ip addr add $XBEE0_NET_SRC_IP/24 dev $XBEE0_NET_IFACE_NAME
+    ip link set dev $XBEE0_NET_IFACE_NAME up
+
+    brctl addbr br0
+    brctl addif br0 $XBEE0_NET_IFACE_NAME
+    ip link set dev br0 up
+}
+
+# Monitor and bridge Wi-Fi
+#   - If a connected wifi interface is found
+#       - Add it to the bridge interface with xbnet
+# - Else
+#     - keep looking for a newly established connection with a wifi interface
+monitor_and_bridge_wifi() {
+    while true; do
+        HOST_WIFI_IFACE=$(get_connected_wifi_device)
+        
+        if [ -n "$HOST_WIFI_IFACE" ]; then
+            echo "Wi-Fi interface found: $HOST_WIFI_IFACE. Bridging with $XBEE0_NET_IFACE_NAME..."
+            brctl addif br0 $HOST_WIFI_IFACE
+
+            iptables -t nat -A POSTROUTING -o $HOST_WIFI_IFACE -j MASQUERADE
+            iptables -A FORWARD -i br0 -o $HOST_WIFI_IFACE -j ACCEPT
+            iptables -A FORWARD -i $HOST_WIFI_IFACE -o br0 -j ACCEPT
+
+            echo "Bridge configured. Monitoring for changes..."
+            break
+        else
+            echo "No Wi-Fi interface found. Rechecking in 5 seconds..."
+            sleep 5
+        fi
+    done
+}
+
+# Function to monitor the XBee device and restart setup if disconnected
+monitor_xbee_device() {
+    while [ -e "$XBEE0_PORT" ]; do
+        sleep 5
+    done
+
+    echo "XBee device at $XBEE0_PORT was removed. Cleaning up..."
+    cleanup
+}
+
+# Main function to set up the XBee network 
+setup_xbee_network() {
+    while true; do
+        check_xbee_device
+        if [ $? -ne 0 ]; then
+            sleep 5
+            continue
+        fi
+
+        start_xbnet_interface
+        if [ $? -ne 0 ]; then
+            cleanup
+            sleep 5
+            continue
+        fi
+
+        configure_network_and_bridge
+        monitor_and_bridge_wifi
+        monitor_xbee_device
+    done
+}
+
+# Run the setup only if the script is executed as root
+check_root
+setup_xbee_network

scripts/get_connected_wifi_info.sh

@@ -1,5 +1,15 @@
+# get_connected_wifi_info.sh
+#
+# Usage: eg. 
+#   source ./get_connected_wifi_info.sh
+#   wifi_device=$(get_connected_wifi_device)
+#   wifi_name=$(get_connected_wifi_name)
+#
+
 #!/bin/bash
 
+# get_connected_wifi_device()
+# - Returns wifi device id, eg. wlp0s20f3
 get_connected_wifi_device() {
     # Get the active Wi-Fi connections
     connections=$(nmcli -t -f DEVICE,TYPE,STATE device | grep -E '^.*:wifi:connected$' | cut -d: -f1)
@@ -13,6 +23,8 @@ get_connected_wifi_device() {
     fi
 }
 
+# get_connected_wifi_device()
+# - Returns wifi device name, eg. spiri-field
 get_connected_wifi_name() {
     # Get the device name of the first connected Wi-Fi device
     device=$(get_connected_wifi_device)

scripts/health_check.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# Ensure the environment variables are loaded
+source /etc/environment
+
+# Perform the health check by pinging the xbnet interface
+# - If the xbnet0 interface is successfully created, we should be able to ping the assigned IP 
+ping -c 1 "$XBEE0_NET_SRC_IP" > /dev/null 2>&1
+
+# Return the appropriate status based on ping success
+if [ $? -eq 0 ]; then
+    exit 0
+else
+    exit 1
+fi

supervisord.conf

@@ -0,0 +1,8 @@
+[supervisord]
+nodaemon=true
+
+[program:xbnet]
+command=/entrypoint.sh
+autorestart=true
+stderr_logfile=/var/log/xbnet.err.log
+stdout_logfile=/var/log/xbnet.out.log