Error, cannot retrieve rplidar health code: 80008000

[wsung1]

Hi, there,
I'm using S2 model based on RPLIDAR ROS package with ROS melodic and Ubuntu 18.04.
One unit works fine but multiple units throw an error:
[ERROR] [1692239374.076535278]: Error, cannot retrieve rplidar health code: 80008000
when launching with, for example,

  <include ns="lidar0" file="$(find rplidar_ros)/launch/rplidar_s2.launch">
    <param name="serial_port" value="/dev/ttyUSB0"/>
  </include>
  <include ns="lidar1" file="$(find rplidar_ros)/launch/rplidar_s2.launch">
    <param name="serial_port" value="/dev/ttyUSB1"/>
  </include>

Right before the error occurs in the other unit, one unit says
"RPLidar health status : OK."
indicating that the first unit passes the health check but the following one fails.
FYI, the health status is checked by
https://github.com/Slamtec/rplidar_ros/blob/2f10ad5be867a6192fb28306cfc1307213a19850/src/node.cpp#L162C38-L162C44
As shown below, this error has been reported before but it was not sorted out properly.
https://answers.ros.org/question/207222/how-to-connect-two-rplidars-on-one-computer/
Do you have any idea?
Thanks for your interest.

[deyouslamtec]

try it. I tried it feasible

<group ns="rplidar1">
    <include  file="$(find rplidar_ros)/launch/rplidar_a2m12.launch" />
    <param name="/rplidar1/rplidarNode/serial_port"  value="/dev/ttyUSB0"/>
</group>
<group ns="rplidar2">
    <include file="$(find rplidar_ros)/launch/rplidar_a2m8.launch" />
    <param  name="/rplidar2/rplidarNode/serial_port"  value="/dev/ttyUSB1"  />
</group>

[YHuniv15]

Thank you.

What .launch file are used for the Rplidar 10N and 10 NP ?
https://fr.aliexpress.com/item/1005004178345980.html?gatewayAdapt=glo2fra
This lidar is installed on this robot , but I get the error in scrren .
https://www.roboworks.net/store/p/rosbot-pro

I used : for N10

  <node name="rplidarNode"          pkg="rplidar_ros"  type="rplidarNode" output="screen">
  <param name="serial_port"         type="string" value="/dev/ttyUSB0"/>
  <param name="serial_baudrate"     type="int"    value="230400"/>
  <param name="frame_id"            type="string" value="laser"/>
  <param name="inverted"            type="bool"   value="false"/>
  <param name="angle_compensate"    type="bool"   value="true"/>
  

for N10P :

  <node name="rplidarNode"          pkg="rplidar_ros"  type="rplidarNode" output="screen">
  <param name="serial_port"         type="string" value="/dev/ttyUSB0"/>
  <param name="serial_baudrate"     type="int"    value="256000"/>
  <param name="frame_id"            type="string" value="laser"/>
  <param name="inverted"            type="bool"   value="false"/>
  <param name="angle_compensate"    type="bool"   value="true"/>
  

Thanks again

[deyouslamtec]

N10/N10P is not our product, rplidar_ros does not adapt to this radar.You can consult the manufacturer.