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Handling empty ros message I am publishing data to a ROS topic in a node. Basically when an object is detected it publis

I have 2 ROS nodes running sequentially from a script. Node1 sets some params in the parameter server which are to be used by node2. But node2 starts after node1 is killed. Currently I have a yaml config file where the dummy values of the params are saved and I load this file in the launch file. As soon as node1 starts I can see the params being updated in the server to new values. Node1 is killed and node2 starts. But node2 is using the dummy values set in yaml

How do I make sure node2 uses new values set by node1 in the parameter server?

using rospy.set_param to set the values in node1 and rospy.get_param in node2 to read the params

Get ros params from parameter server I have 2 ROS nodes running sequentially from a script. Node1 sets some params in th

My node1 sets some parameters that will be used by node2. So I want the node2 to start after the parameters are set by n

Launching 2 ros nodes Hi I am trying to launch two ros nodes from a launch file. This is how my main launch file looks l

I am unable to set parameters to the param server using the following code:

hsv = cv2.cvtColor(image, cv2.COLOR_BGR2HSV)

rospy.set_param("lower_h", hsv[:, :, 0].min()) rospy.set_param("lower_s", hsv[:, :, 1].min()) rospy.set_param("lower_v", hsv[:, :, 2].min())

print('lower_h = {}\nlower_s = {}\nlower_v = {}'.format(hsv[:, :, 0].min(), hsv[:, :, 1].min(), hsv[:, :, 2].min()))

I am getting the following error: TypeError: cannot marshal <type 'numpy.uint8'> objects

In the above code I am able to print the values in the terminal but not set the values in the parameter server. Any help will be appreciated.

TypeError: cannot marshal <type 'numpy.uint8'=""> objects I am unable to set parameters to the param server using

Find abrupt spike and fall in laser intensity data I am publishing laser intensity data to a topic continously while the

Laser rangefinder and monocular camera extrinsic calibration I have a laser giving out range data and a monocular camera

Import error: cannot import Hi I have a Python node in which I am trying to import SORT package and use it. I know I can