# Revision history [back]

### Clock (sim time) from Ign-Gazebo to ROS2

I am trying to use sim time in ROS2 with ignition gazebo in order to control joints of a humanoid robot.

To do that, I launch the ignition bridge for /clock topic and set "use_sim_time" true for both of ign-bridge and a node that publishes desire joint angles based on sim time.

The node display the sim time as follows

double SimTime=node().now().nanoseconds();
RCLCPP_INFO(this->get_logger(), "NANOsec: '%f'", SimTime);


However, it is always zero.

Details:

In both ignition gazebo and ros2, /clocktopic echos the same sim time -> ignition bridge works properly.

The frequency of desire joint angles became same as the frequency of publisher after setting "use_sim_time" true.

In the case where use_sim_time" is false, it shows the system time properly.

I know some answers for classic gazebo and ROS2 (this) But, I cannot use them because "ros_init" is not available for ignition-gazebo.

Please let me where I went wrong and solutions. If you also show the code that using sim time in ROS2 from ignition-gazebo, I would appreciate you.

Thanks,

### Clock (sim time) from Ign-Gazebo to ROS2

I am trying to use sim time in ROS2 with ignition gazebo in order to control joints of a humanoid robot.

To do that, I launch the ignition bridge for /clock topic and set "use_sim_time" true for both of ign-bridge and a node that publishes desire joint angles based on sim time.

The node display the sim time as follows

double SimTime=node().now().nanoseconds();
RCLCPP_INFO(this->get_logger(), "NANOsec: '%f'", SimTime);


However, it is always zero.

Details:

1. In both ignition gazebo and ros2, /clocktopic echos the same sim time -> ignition bridge works properly.

2. The frequency of desire joint angles became same as the frequency of publisher after setting "use_sim_time" true.

3. In the case where use_sim_time" is false, it shows the system time properly.

I know some answers for classic gazebo and ROS2 (this) But, I cannot use them because "ros_init" is not available for ignition-gazebo.

Please let me where I went wrong and solutions. If you also show the code that using sim time in ROS2 from ignition-gazebo, I would appreciate you.

Thanks, Thanks,

### Clock (sim time) from Ign-Gazebo to ROS2

I am trying to use sim time in ROS2 with ignition gazebo in order to control joints of a humanoid robot.

To do that, I launch the ignition bridge for /clock /clock topic and set "use_sim_time" true for both of ign-bridge and a node that publishes desire joint angles based on sim time.

The node display the sim time as follows

double SimTime=node().now().nanoseconds();
RCLCPP_INFO(this->get_logger(), "NANOsec: '%f'", SimTime);


However, it is always zero.

Details:

1. In both ignition gazebo and ros2, /clocktopic echos the same sim time -> ignition bridge works properly.
2. The frequency of desire joint angles became same as the frequency of publisher after setting "use_sim_time" true.
3. In the case where use_sim_time" is false, it shows the system time properly.

I know some answers for classic gazebo and ROS2 (this) But, I cannot use them because "ros_init" is not available for ignition-gazebo.

Please let me where I went wrong and solutions. If you also show the code that using sim time in ROS2 from ignition-gazebo, I would appreciate you.

Thanks,

### Clock (sim time) from Ign-Gazebo to ROS2

I am trying to use sim time in ROS2 with ignition gazebo in order to control joints of a humanoid robot.

To do that, I launch the ignition bridge for /clock topic and set "use_sim_time" use_sim_time true for both of ign-bridge and a node that publishes desire joint angles based on sim time.

The node display the sim time as follows

double SimTime=node().now().nanoseconds();
RCLCPP_INFO(this->get_logger(), "NANOsec: '%f'", SimTime);


However, it is always zero.

Details:

1. In both ignition gazebo and ros2, /clocktopic echos the same sim time -> ignition bridge works properly.
2. The frequency of desire joint angles became same as the frequency of publisher after setting "use_sim_time" use_sim_time true.
3. In the case where use_sim_time" use_sim_time is false, it shows the system time properly.

I know some answers for classic gazebo and ROS2 (this) But, I cannot use them because "ros_init" is not available for ignition-gazebo.

Please let me where I went wrong and solutions. If you also show the code that using sim time in ROS2 from ignition-gazebo, I would appreciate you.

Thanks,