Execute Code Based on ROS Time

Using a rosrate object allows you to control the rate of your code execution based on the ROS Time /clock topic or system time on your computer. By executing code at constant intervals, you can accurately time and schedule tasks. These examples show different applications for the rosrate object including its uses with ROS image messages and sending commands for robot control.

For other applications based on system time, consider the rateControl (Navigation Toolbox) object.

Send Fixed-rate Control Commands To A Robot

Open Live Script

This example shows to send regular commands to a robot at a fixed rate. It uses the Rate object to execute a loop that publishes std_msgs/Twist messages to the network at a regular interval.

Setup ROS network. Specify the IP address if your ROS network already exists.

rosinit
Launching ROS Core...
Status before launching ros core :0
result before launching ros core:     880 ?        Ssl   13:22 /usr/bin/python3 /usr/bin/mta-sts-daemon --config /etc/mta-sts-daemon.yml
   1131 ?        Ssl    0:00 /usr/bin/python3 /usr/share/unattended-upgrades/unattended-upgrade-shutdown --wait-for-signal
 467850 ?        Ss     0:00 /bin/sh /usr/bin/xvfb-run -a -s -screen 0 1280x1024x24 /bin/sh -c export TMPDIR=/tmp/Bdoc25b_3175293_1555099 COMPONENT=examples/ros ;   cd /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/matlab/examples/ros ; //mathworks/hub/bat/common/bin/mw   sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467880 ?        S      0:00 /bin/sh -c export TMPDIR=/tmp/Bdoc25b_3175293_1555099 COMPONENT=examples/ros ;   cd /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/matlab/examples/ros ; //mathworks/hub/bat/common/bin/mw   sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467893 ?        S      0:00 sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467944 ?        S      0:00 perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 469441 pts/1    S+     0:00 /bin/bash -c ps ax | grep -E 'ros|python'
 469443 pts/1    S+     0:00 grep -E ros|python

.Done in 1.3937 seconds.
* Inside getProcessPID function *
Process Name: /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/bin/glnxa64 rosmaster --core -p 59558 -w 3
Status before getting PID :0
Result before getting PID :    880 ?        Ssl   13:22 /usr/bin/python3 /usr/bin/mta-sts-daemon --config /etc/mta-sts-daemon.yml
   1131 ?        Ssl    0:00 /usr/bin/python3 /usr/share/unattended-upgrades/unattended-upgrade-shutdown --wait-for-signal
 467850 ?        Ss     0:00 /bin/sh /usr/bin/xvfb-run -a -s -screen 0 1280x1024x24 /bin/sh -c export TMPDIR=/tmp/Bdoc25b_3175293_1555099 COMPONENT=examples/ros ;   cd /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/matlab/examples/ros ; //mathworks/hub/bat/common/bin/mw   sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467880 ?        S      0:00 /bin/sh -c export TMPDIR=/tmp/Bdoc25b_3175293_1555099 COMPONENT=examples/ros ;   cd /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/matlab/examples/ros ; //mathworks/hub/bat/common/bin/mw   sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467893 ?        S      0:00 sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467944 ?        S      0:00 perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 469446 pts/1    S      0:00 bash /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/toolbox/ros/mlroscpp/util/+ros/+internal/runroscmd.sh   /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/sys/ros1/glnxa64/ros1 /tmp/Bdoc25b_3175293_1555099/tpc1ae414a_f2d6_4c2c_ae7e_f50126baa4ea/ros1/glnxa64/venv /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/bin/glnxa64 rosmaster --core -p 59558 -w 3
 469458 pts/1    Sl     0:00 python3 /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/sys/ros1/glnxa64/ros1/bin/rosmaster --core -p 59558 -w 3
 469467 pts/1    S+     0:00 /bin/bash -c ps ax | grep -E 'ros|python'
 469469 pts/1    S+     0:00 grep -E ros|python

Result:  469446 pts/1    S      0:00 bash /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/toolbox/ros/mlroscpp/util/+ros/+internal/runroscmd.sh   /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/sys/ros1/glnxa64/ros1 /tmp/Bdoc25b_3175293_1555099/tpc1ae414a_f2d6_4c2c_ae7e_f50126baa4ea/ros1/glnxa64/venv /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/bin/glnxa64 rosmaster --core -p 59558 -w 3

Status: 0
PID obtained: 469446
Status after getting PID :0
Result after getting PID :    880 ?        Ssl   13:22 /usr/bin/python3 /usr/bin/mta-sts-daemon --config /etc/mta-sts-daemon.yml
   1131 ?        Ssl    0:00 /usr/bin/python3 /usr/share/unattended-upgrades/unattended-upgrade-shutdown --wait-for-signal
 467850 ?        Ss     0:00 /bin/sh /usr/bin/xvfb-run -a -s -screen 0 1280x1024x24 /bin/sh -c export TMPDIR=/tmp/Bdoc25b_3175293_1555099 COMPONENT=examples/ros ;   cd /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/matlab/examples/ros ; //mathworks/hub/bat/common/bin/mw   sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467880 ?        S      0:00 /bin/sh -c export TMPDIR=/tmp/Bdoc25b_3175293_1555099 COMPONENT=examples/ros ;   cd /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/matlab/examples/ros ; //mathworks/hub/bat/common/bin/mw   sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467893 ?        S      0:00 sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467944 ?        S      0:00 perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 469446 pts/1    S      0:00 bash /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/toolbox/ros/mlroscpp/util/+ros/+internal/runroscmd.sh   /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/sys/ros1/glnxa64/ros1 /tmp/Bdoc25b_3175293_1555099/tpc1ae414a_f2d6_4c2c_ae7e_f50126baa4ea/ros1/glnxa64/venv /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/bin/glnxa64 rosmaster --core -p 59558 -w 3
 469458 pts/1    Sl     0:00 python3 /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/sys/ros1/glnxa64/ros1/bin/rosmaster --core -p 59558 -w 3
 469474 pts/1    S+     0:00 /bin/bash -c ps ax | grep -E 'ros|python'
 469476 pts/1    S+     0:00 grep -E ros|python

* Exiting getProcessPID function *
Status after launching ros core :0
result after launching ros core:     880 ?        Ssl   13:22 /usr/bin/python3 /usr/bin/mta-sts-daemon --config /etc/mta-sts-daemon.yml
   1131 ?        Ssl    0:00 /usr/bin/python3 /usr/share/unattended-upgrades/unattended-upgrade-shutdown --wait-for-signal
 467850 ?        Ss     0:00 /bin/sh /usr/bin/xvfb-run -a -s -screen 0 1280x1024x24 /bin/sh -c export TMPDIR=/tmp/Bdoc25b_3175293_1555099 COMPONENT=examples/ros ;   cd /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/matlab/examples/ros ; //mathworks/hub/bat/common/bin/mw   sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467880 ?        S      0:00 /bin/sh -c export TMPDIR=/tmp/Bdoc25b_3175293_1555099 COMPONENT=examples/ros ;   cd /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/matlab/examples/ros ; //mathworks/hub/bat/common/bin/mw   sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467893 ?        S      0:00 sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467944 ?        S      0:00 perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 469446 pts/1    S      0:00 bash /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/toolbox/ros/mlroscpp/util/+ros/+internal/runroscmd.sh   /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/sys/ros1/glnxa64/ros1 /tmp/Bdoc25b_3175293_1555099/tpc1ae414a_f2d6_4c2c_ae7e_f50126baa4ea/ros1/glnxa64/venv /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/bin/glnxa64 rosmaster --core -p 59558 -w 3
 469458 pts/1    Sl     0:00 python3 /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/sys/ros1/glnxa64/ros1/bin/rosmaster --core -p 59558 -w 3
 469477 pts/1    S+     0:00 /bin/bash -c ps ax | grep -E 'ros|python'
 469479 pts/1    S+     0:00 grep -E ros|python

Status before deleting node :0
Result before deleting node :    880 ?        Ssl   13:22 /usr/bin/python3 /usr/bin/mta-sts-daemon --config /etc/mta-sts-daemon.yml
   1131 ?        Ssl    0:00 /usr/bin/python3 /usr/share/unattended-upgrades/unattended-upgrade-shutdown --wait-for-signal
 467850 ?        Ss     0:00 /bin/sh /usr/bin/xvfb-run -a -s -screen 0 1280x1024x24 /bin/sh -c export TMPDIR=/tmp/Bdoc25b_3175293_1555099 COMPONENT=examples/ros ;   cd /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/matlab/examples/ros ; //mathworks/hub/bat/common/bin/mw   sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467880 ?        S      0:00 /bin/sh -c export TMPDIR=/tmp/Bdoc25b_3175293_1555099 COMPONENT=examples/ros ;   cd /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/matlab/examples/ros ; //mathworks/hub/bat/common/bin/mw   sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467893 ?        S      0:00 sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467944 ?        S      0:00 perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 469446 pts/1    S      0:00 bash /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/toolbox/ros/mlroscpp/util/+ros/+internal/runroscmd.sh   /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/sys/ros1/glnxa64/ros1 /tmp/Bdoc25b_3175293_1555099/tpc1ae414a_f2d6_4c2c_ae7e_f50126baa4ea/ros1/glnxa64/venv /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/bin/glnxa64 rosmaster --core -p 59558 -w 3
 469458 pts/1    Sl     0:00 python3 /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/sys/ros1/glnxa64/ros1/bin/rosmaster --core -p 59558 -w 3
 469482 ?        Sl     0:00 /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/toolbox/ros/bin/glnxa64/libmwros1server -mvmInputPipe 738 -1 -mvmOutputPipe -1 754
 469497 pts/1    S+     0:00 /bin/bash -c ps ax | grep -E 'ros|python'
 469499 pts/1    S+     0:00 grep -E ros|python

Status after deleting node :0
Result after deleting node :    880 ?        Ssl   13:22 /usr/bin/python3 /usr/bin/mta-sts-daemon --config /etc/mta-sts-daemon.yml
   1131 ?        Ssl    0:00 /usr/bin/python3 /usr/share/unattended-upgrades/unattended-upgrade-shutdown --wait-for-signal
 467850 ?        Ss     0:00 /bin/sh /usr/bin/xvfb-run -a -s -screen 0 1280x1024x24 /bin/sh -c export TMPDIR=/tmp/Bdoc25b_3175293_1555099 COMPONENT=examples/ros ;   cd /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/matlab/examples/ros ; //mathworks/hub/bat/common/bin/mw   sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467880 ?        S      0:00 /bin/sh -c export TMPDIR=/tmp/Bdoc25b_3175293_1555099 COMPONENT=examples/ros ;   cd /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/matlab/examples/ros ; //mathworks/hub/bat/common/bin/mw   sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467893 ?        S      0:00 sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467944 ?        S      0:00 perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 469446 pts/1    S      0:00 bash /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/toolbox/ros/mlroscpp/util/+ros/+internal/runroscmd.sh   /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/sys/ros1/glnxa64/ros1 /tmp/Bdoc25b_3175293_1555099/tpc1ae414a_f2d6_4c2c_ae7e_f50126baa4ea/ros1/glnxa64/venv /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/bin/glnxa64 rosmaster --core -p 59558 -w 3
 469458 pts/1    Sl     0:00 python3 /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/sys/ros1/glnxa64/ros1/bin/rosmaster --core -p 59558 -w 3
 469503 pts/1    S+     0:00 /bin/bash -c ps ax | grep -E 'ros|python'
 469505 pts/1    S+     0:00 grep -E ros|python

Initializing ROS master on http://172.20.30.229:59558.
Initializing global node /matlab_global_node_09058 with NodeURI http://dcc2933910glnxa64:32913/ and MasterURI http://localhost:59558.

Setup publisher and message to send Twist commands.

[pub,msg] = rospublisher('/cmd_vel','geometry_msgs/Twist');
msg.Linear.X = 0.5;
msg.Angular.Z = -0.5;

Create Rate object with specified loop parameters.

desiredRate = 10;
rate = robotics.Rate(desiredRate);
rate.OverrunAction = 'drop'
rate = 
  rateControl with properties:

         DesiredRate: 10
       DesiredPeriod: 0.1000
       OverrunAction: 'drop'
    TotalElapsedTime: 0.1728
          LastPeriod: NaN

Run loop and hold each iteration using waitfor(rate). Send the Twist message inside the loop. Reset the Rate object before the loop to reset timing.

reset(rate)

while rate.TotalElapsedTime < 10
   send(pub,msg)
   waitfor(rate);
end

View statistics of fixed-rate execution. Look at AveragePeriod to verify the desired rate was maintained.

statistics(rate)
ans = struct with fields:
              Periods: [0.1072 0.0930 0.0999 0.1000 0.1000 0.1000 0.1001 0.0999 0.1001 0.0999 0.1001 0.0999 0.1001 0.0999 0.1001 0.0999 0.1001 0.0999 0.1001 0.0999 0.1001 0.0999 0.1001 0.0998 0.1002 0.0998 0.1001 0.0999 0.1001 0.0999 … ] (1×100 double)
           NumPeriods: 100
        AveragePeriod: 0.1000
    StandardDeviation: 0.0010
          NumOverruns: 0

Shut down ROS network.

rosshutdown
Shutting down global node /matlab_global_node_09058 with NodeURI http://dcc2933910glnxa64:32913/ and MasterURI http://localhost:59558.
Status before deleting node :0
Result before deleting node :    880 ?        Ssl   13:22 /usr/bin/python3 /usr/bin/mta-sts-daemon --config /etc/mta-sts-daemon.yml
   1131 ?        Ssl    0:00 /usr/bin/python3 /usr/share/unattended-upgrades/unattended-upgrade-shutdown --wait-for-signal
 467850 ?        Ss     0:00 /bin/sh /usr/bin/xvfb-run -a -s -screen 0 1280x1024x24 /bin/sh -c export TMPDIR=/tmp/Bdoc25b_3175293_1555099 COMPONENT=examples/ros ;   cd /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/matlab/examples/ros ; //mathworks/hub/bat/common/bin/mw   sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467880 ?        S      0:00 /bin/sh -c export TMPDIR=/tmp/Bdoc25b_3175293_1555099 COMPONENT=examples/ros ;   cd /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/matlab/examples/ros ; //mathworks/hub/bat/common/bin/mw   sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467893 ?        S      0:00 sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467944 ?        S      0:00 perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 469446 pts/1    S      0:00 bash /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/toolbox/ros/mlroscpp/util/+ros/+internal/runroscmd.sh   /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/sys/ros1/glnxa64/ros1 /tmp/Bdoc25b_3175293_1555099/tpc1ae414a_f2d6_4c2c_ae7e_f50126baa4ea/ros1/glnxa64/venv /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/bin/glnxa64 rosmaster --core -p 59558 -w 3
 469458 pts/1    Sl     0:00 python3 /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/sys/ros1/glnxa64/ros1/bin/rosmaster --core -p 59558 -w 3
 469506 ?        Sl     0:00 /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/toolbox/ros/bin/glnxa64/libmwros1server -mvmInputPipe 738 -1 -mvmOutputPipe -1 754
 469541 pts/1    S+     0:00 /bin/bash -c ps ax | grep -E 'ros|python'
 469543 pts/1    S+     0:00 grep -E ros|python

Status after deleting node :0
Result after deleting node :    880 ?        Ssl   13:22 /usr/bin/python3 /usr/bin/mta-sts-daemon --config /etc/mta-sts-daemon.yml
   1131 ?        Ssl    0:00 /usr/bin/python3 /usr/share/unattended-upgrades/unattended-upgrade-shutdown --wait-for-signal
 467850 ?        Ss     0:00 /bin/sh /usr/bin/xvfb-run -a -s -screen 0 1280x1024x24 /bin/sh -c export TMPDIR=/tmp/Bdoc25b_3175293_1555099 COMPONENT=examples/ros ;   cd /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/matlab/examples/ros ; //mathworks/hub/bat/common/bin/mw   sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467880 ?        S      0:00 /bin/sh -c export TMPDIR=/tmp/Bdoc25b_3175293_1555099 COMPONENT=examples/ros ;   cd /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/matlab/examples/ros ; //mathworks/hub/bat/common/bin/mw   sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467893 ?        S      0:00 sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467944 ?        S      0:00 perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 469446 pts/1    S      0:00 bash /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/toolbox/ros/mlroscpp/util/+ros/+internal/runroscmd.sh   /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/sys/ros1/glnxa64/ros1 /tmp/Bdoc25b_3175293_1555099/tpc1ae414a_f2d6_4c2c_ae7e_f50126baa4ea/ros1/glnxa64/venv /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/bin/glnxa64 rosmaster --core -p 59558 -w 3
 469458 pts/1    Sl     0:00 python3 /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/sys/ros1/glnxa64/ros1/bin/rosmaster --core -p 59558 -w 3
 469547 pts/1    S+     0:00 /bin/bash -c ps ax | grep -E 'ros|python'
 469549 pts/1    S+     0:00 grep -E ros|python

Shutting down ROS master on http://172.20.30.229:59558.
Status before deleting core :0
Result before deleting core :    880 ?        Ssl   13:22 /usr/bin/python3 /usr/bin/mta-sts-daemon --config /etc/mta-sts-daemon.yml
   1131 ?        Ssl    0:00 /usr/bin/python3 /usr/share/unattended-upgrades/unattended-upgrade-shutdown --wait-for-signal
 467850 ?        Ss     0:00 /bin/sh /usr/bin/xvfb-run -a -s -screen 0 1280x1024x24 /bin/sh -c export TMPDIR=/tmp/Bdoc25b_3175293_1555099 COMPONENT=examples/ros ;   cd /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/matlab/examples/ros ; //mathworks/hub/bat/common/bin/mw   sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467880 ?        S      0:00 /bin/sh -c export TMPDIR=/tmp/Bdoc25b_3175293_1555099 COMPONENT=examples/ros ;   cd /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/matlab/examples/ros ; //mathworks/hub/bat/common/bin/mw   sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467893 ?        S      0:00 sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467944 ?        S      0:00 perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 469446 pts/1    S      0:00 bash /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/toolbox/ros/mlroscpp/util/+ros/+internal/runroscmd.sh   /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/sys/ros1/glnxa64/ros1 /tmp/Bdoc25b_3175293_1555099/tpc1ae414a_f2d6_4c2c_ae7e_f50126baa4ea/ros1/glnxa64/venv /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/bin/glnxa64 rosmaster --core -p 59558 -w 3
 469458 pts/1    Sl     0:00 python3 /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab/sys/ros1/glnxa64/ros1/bin/rosmaster --core -p 59558 -w 3
 469550 pts/1    S+     0:00 /bin/bash -c ps ax | grep -E 'ros|python'
 469552 pts/1    S+     0:00 grep -E ros|python

* Inside killProcessByPID function *
PID of core to be killed: 469446
Status after Child Process Killed: 0
Result after Child Process Killed: 
Status after deleting core :0
Result after deleting core :    880 ?        Ssl   13:22 /usr/bin/python3 /usr/bin/mta-sts-daemon --config /etc/mta-sts-daemon.yml
   1131 ?        Ssl    0:00 /usr/bin/python3 /usr/share/unattended-upgrades/unattended-upgrade-shutdown --wait-for-signal
 467850 ?        Ss     0:00 /bin/sh /usr/bin/xvfb-run -a -s -screen 0 1280x1024x24 /bin/sh -c export TMPDIR=/tmp/Bdoc25b_3175293_1555099 COMPONENT=examples/ros ;   cd /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/matlab/examples/ros ; //mathworks/hub/bat/common/bin/mw   sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467880 ?        S      0:00 /bin/sh -c export TMPDIR=/tmp/Bdoc25b_3175293_1555099 COMPONENT=examples/ros ;   cd /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/matlab/examples/ros ; //mathworks/hub/bat/common/bin/mw   sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467893 ?        S      0:00 sh ../../tools/build_using_mlpath/mlenv --use-scoped-paths 1 --scoped-cppms-file /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168/scoped_cppms_modules.txt --scoped-cppms-envvar MW_SCOPED_CPPMICROSERVICES_MODULES --tag bml --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --paths /mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MATLAB_LOG_DIR=/mathworks/devel/bat/Bdoc25b/logs/3175293/build.glnxa64.3175293.r000/examples/ros/build.glnxa64.3175293.r000.bml.8a0672ac9b49152569df99eed4417168 MAKEFLAGS= DISPLAY=:0 MESA_BACK_BUFFER=Pixmap perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 467944 ?        S      0:00 perl ../../tools/build_using_matlab/mlrun --verbose --runnable /mathworks/devel/bat/filer/batfs2566-0/Bdoc25b.3175293.Bdoc25b.3168145.pass/build/runnable/matlab --display mwtools.liveCodeToDocbook ../../derived/glnxa64/examples/ros/mlx_to_docbook7.txt ../../derived/glnxa64/examples/ros examples/ros ../../help/examples/ros/glnxa64 //mathworks/hub/3rdparty/R2021a/6299939/glnxa64/pngquant 1
 469557 pts/1    S+     0:00 /bin/bash -c ps ax | grep -E 'ros|python'
 469559 pts/1    S+     0:00 grep -E ros|python

* Exiting killProcessByPID function *

Fixed-rate Publishing of ROS Image Data

Open Live Script

This example shows how to regularly publish and receive image messages using ROS and the rosrate function. The rosrate function creates a Rate object to regularly access the /camera/rgb/image_raw topic on the ROS network using a subscriber. The rgb image is converted to a grayscale using rgb2gray and republished at a regular interval. Parameters such as the IP address and topic names vary with your robot and setup.

Connect to ROS network. Setup subscriber, publisher, and data message.

ipaddress = '192.168.203.129'; % Replace with your network address
rosinit(ipaddress)
Initializing global node /matlab_global_node_10650 with NodeURI http://192.168.203.1:50899/

sub = rossubscriber('/camera/rgb/image_raw');
pub = rospublisher('/camera/gray/image_gray','sensor_msgs/Image');
msgGray = rosmessage('sensor_msgs/Image');
msgGray.Encoding = 'mono8';

Receive the first image message. Extract image and convert to a grayscale image. Display grayscale image and publish the message.

msgImg = receive(sub);

img = readImage(msgImg);
grayImg = rgb2gray(img);
imshow(grayImg)

writeImage(msgGray,grayImg)
send(pub,msgGray)

Create ROS Rate object to execute at 10 Hz. Set a loop time and the OverrunAction for handling 

desiredRate = 10;
loopTime = 5;
overrunAction = 'slip';
rate = rosrate(desiredRate);
r.OverrunAction = overrunAction;

Begin loop to receive, process and send messages every 0.1 seconds (10 Hz). Reset the Rate object before beginning.

reset(rate)

for i = 1:desiredRate*loopTime
    
    msgImg = receive(sub);

    img = readImage(msgImg);
    grayImg = rgb2gray(img);
    writeImage(msgGray,grayImg)

    send(pub,msgGray)
    
    waitfor(rate);
end

View the statistics for the code execution. AveragePeriod and StandardDeviation show how well the code maintained the desiredRate. OverRuns occur when data processing takes longer than the desired period length.

statistics(rate)
ans = struct with fields:
              Periods: [1×50 double]
           NumPeriods: 50
        AveragePeriod: 0.1000
    StandardDeviation: 0.0083
          NumOverruns: 0

Shut down ROS node

rosshutdown
Shutting down global node /matlab_global_node_10650 with NodeURI http://192.168.203.1:50899/

See Also

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