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anqixu / ueye_cam

A ROS nodelet and node that wraps the driver API for UEye cameras by IDS Imaging Development Systems GMBH.
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Duplicating the rgb8.launch making issue #96

Closed dt-developer1 closed 3 years ago

dt-developer1 commented 3 years ago

I have 3 Ueye cameras and i am using this package to publish streams to ros . I duplicated rgb8.launch for for each cmeras and i created 3 launch files. I changed node name , camera_name and camera_id for each camera.

cam1_launch.txt cam2_launch.txt cam3_launch.txt

Now, when i am starting first camera, it working and i am getting data in ros. when i am launching second or third camera after 1 camera , i am getting error in cam1.launch like

[ INFO] [1607236696.973853566]: [camera1] set to free-run mode [ERROR] [1607236711.938520154]: Cannot load nodelet /ueye_cam_nodelet for one exists with that name already [ WARN] [1607236711.945882950]: Shutdown request received. Reason: [[/ueye_cam_nodelet] Reason: new node registered with same name] [ WARN] [1607236711.947521305]: Shutdown request received. [ WARN] [1607236711.947627881]: Reason given for shutdown: [[/nodelet_manager] Reason: new node registered with same name] [FATAL] [1607236712.025064890]: Failed to unload nodelet '/ueye_cam_nodelet from manager nodelet_manager'

and in cam2.launch

process[nodelet_manager-2]: started with pid [29308] process[ueye_cam_nodelet-3]: started with pid [29309] [FATAL] [1607236711.938587608]: Failed to load nodelet '/ueye_cam_nodelet of type ueye_cam/ueye_cam_nodelet to manager nodelet_manager' [ INFO] [1607236711.948214427]: Initializing nodelet with 12 worker threads. [ERROR] [1607236712.024385110]: Failed to find nodelet with name '/ueye_cam_nodelet' to unload. [ueye_cam_nodelet-3] process has died [pid 29309, exit code 255, cmd /opt/ros/noetic/lib/nodelet/nodelet load ueye_cam/ueye_cam_nodelet nodelet_manager __name:=ueye_cam_nodelet __log:=/home/atc8110/.ros/log/f884f278-3784-11eb-877b-173023e66b60/ueye_cam_nodelet-3.log]. log file: /home/atc8110/.ros/log/f884f278-3784-11eb-877b-173023e66b60/ueye_cam_nodelet-3*.log What will be the issue?

nullket commented 3 years ago

  1. The output is hard to read when using one grave accent to mark them as code (inline code). Use three grave accents ``` at the beginning (and three at the end) to create a code block preserving the line breaks.

  2. launchfiles should be .launch not .txt

  3. This is due to the launch file trying to create a seconds nodelet manager (with the same name) etc (or similar issue). Anyway: to start multiple cameras you put the all in one launch file. To get an idea how this works look at the master_slave_example (but ignore the whole master -> slave part as it seems like you want three independent cameras)

Please close this issue once this is solved for you

nullket commented 3 years ago

Closing as this is not a bug. It is the design of the driver. Nonetheless, you can still ask for help here.