rosserial_arduino Processing Messages

asked 2012-03-20 03:38:40 -0600

BadRobot

91 ●11 ●13 ●16 http://www.matroscoe.ca/

updated 2012-07-02 13:41:42 -0600

mjcarroll

6414 ●68 ●78 ●100 http://mjcarroll.io/

We are trying to set up a publisher/subscriber that will pull in data from a computer (publishing) that is sending drive commands (direction/speed) to the Arduino to control a UGV. We are also looking to have the Arduino send back information (battery_status, turn angle, speed, etc) and we are having issues with getting everything to work.

I know this is probably a really stupid question but is there a way that I can print out my str_msg.data to the Arduino serial monitor to make sure that I am actually getting that data and that I am not messing up on that 1st basic step?

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Can you describe the issues your experiencing?

Dustin ( 2012-03-21 06:27:52 -0600 )edit

I am having issues getting the information to "ping" back to the sending computer. I am trying to make sure that the arduino is indeed getting what I am sending. So I send the information in a String and i try to pull that data and then have the arduino broadcast it again to prove that it got it.

BadRobot ( 2012-03-22 02:41:50 -0600 )edit

In that case did my answer about creating a debug publisher make sense?

Dustin ( 2012-03-22 07:19:29 -0600 )edit

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answered 2012-03-21 06:27:20 -0600

Dustin

328 ●6 ●11 ●23 http://arl.cs.utah.edu/

It appears the rosserial_python node is looking for data coming over the serial line to be in a specific format. As such you could not send raw debug information on the same serial port. If your Arduino has more than one serial port, as with the Mega, then you could use Serial to send your debug data to the serial monitor and then use Serial1 to publish and subscribe.

Alternatively you could create a debug topic and republish to it any data received. From there you could execute the following command to see the data being published to that topic (assuming the topic is called 'debug'):

rostopic echo debug

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