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Rosserial - unpack requires a string argument of length 2

rosserial_arduino

asked 2014-05-05 12:43:52 -0500

pascalmater
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Hi There, After following the 'Arduino IDE Setup' tutorial (Installing from Source onto the ROS workstation in Groovy) and the 'Hello world' example the following messages were generated:

[INFO] [WallTime: 1399293681.961019] ROS Serial Python Node [INFO] [WallTime: 1399293681.972199] Connecting to /dev/ttyUSB0 at 57600 baud [ERROR] [WallTime: 1399293684.083353] Creation of publisher failed: unpack requires a string argument of length 2 [ERROR] [WallTime: 1399293699.088810] Lost sync with device, restarting...

Is there a mismatch (incompatible) of software versions? I am using Ubuntu 12.04 LTS, rosversion roscpp 1.9.50 and a Arduino Uno

Regards.

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answered 2014-05-07 16:30:19 -0500

pascalmater
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Found a solution: In the 'Arduino IDE Setup' tutorial were it states 'git clone https://github.com/ros-drivers/rosser... add '-b groovy-devel'. So that line should read: 'git clone https://github.com/ros-drivers/rosserial -b groovy-devel' This will check out the code from the goovy-delep branch. The rest stays the same.

Maybe, this is worthwhile adding to this tutorial for us less experienced.

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Asked: 2014-05-05 12:43:52 -0500

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Last updated: May 07 '14

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Rosserial - unpack requires a string argument of length 2