sirius_unity_sim/Assets/Scripts/ROSCollissionDetectionPublisher.cs

using UnityEngine;
using Unity.Robotics.Core;
using Unity.Robotics.ROSTCPConnector;
using RosMessageTypes.Std;

public class ROSCollissionDetectionPublisher : MonoBehaviour
{
    public string topicName = "/collision_detection";
    public bool useNamespace = true;
    public BoolMsg result;


    protected string _namespace;

    ROSConnection ros;

    private void Awake()
    {
        if (useNamespace)
        {
            _namespace = "/" + gameObject.name;
            topicName = topicName[0] == '/' ? _namespace + topicName : _namespace + "/" + topicName;
        }
    }
    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {
        ros = ROSConnection.GetOrCreateInstance();
        ros.RegisterPublisher<BoolMsg>(topicName);
        result = new BoolMsg(false);
    }

    // Update is called once per frame
    void Update()
    {
        ros.Publish(topicName, result);
    }
}