saltybot_bridge 0.1.0 ESP32-S3 USB CDC serial bridge for saltybot. serial_bridge_node: JSON telemetry RX → sensor_msgs/Imu + diagnostics. esp32_cmd_node (Issue #119): binary-framed protocol — STX/TYPE/LEN/CRC16/ETX, commands: HEARTBEAT, SPEED_STEER, ARM, SET_MODE, PID_UPDATE; telemetry: IMU, BATTERY, MOTOR_RPM, ARM_STATE, ERROR; watchdog 500ms. battery_node (Issue #125): SoC tracking, threshold alerts, SQLite history. sl-jetson MIT rclpy python3-paho-mqtt sensor_msgs std_msgs std_srvs geometry_msgs diagnostic_msgs ament_copyright ament_flake8 ament_pep257 python3-pytest ament_python