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2019-07-16 20:08:11 -0500	received badge	● Famous Question (source)
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2016-09-23 23:27:59 -0500	received badge	● Popular Question (source)
2016-09-22 18:03:08 -0500	commented answer	How to enter the callback function only whenever a topic is updated but otherwise keep doing something else? That's exactly what I needed to know, thank you so much!!
2016-09-22 18:03:02 -0500	received badge	● Scholar (source)
2016-09-22 16:21:35 -0500	asked a question	How to enter the callback function only whenever a topic is updated but otherwise keep doing something else? Hello folks, I'm still a beginner here and I'm trying to implement a node that checks if a certain topic is updated. I need it to be like: Whenever the topic updates->do something then return. Otherwise-> keep doing something else. Could that be possible?
2016-09-03 11:02:42 -0500	received badge	● Enthusiast
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2016-08-29 09:15:45 -0500	asked a question	Rosserial sync error I'm having Ros indigo on mint (based on ubunto 14.04), and I installed the rosserial-indigo-devel then continued with this tutorial I tried the HelloWorld example on arduino uno, but after executing `rosrun rosserial_python serial_node.py _port:=/dev/ttyACM0 _baud:=115200` I always get: `[ERROR] [WallTime: 1472473625.892258] Unable to sync with device; possible link problem or link software version mismatch such as hydro rosserial_python with groovy Arduino` while `rosrun rosserial_server serial_node _po:=/dev/ttyACM0` gave me the following: [ INFO] [1472473529.968021454]: Opening serial port. [ INFO] [1472473530.101340451]: Starting session. [ WARN] [1472473531.102213747]: Sync with device lost. [ WARN] [1472473532.104368118]: Sync with device lost. [ INFO] [1472473532.188765803]: Attached client is using protocol VER2 (hydro) [ INFO] [1472473532.206702146]: waitForService: Service [/message_info] has not been advertised, waiting... [ WARN] [1472473537.214496805]: Timed out waiting for message_info service to become available. [ WARN] [1472473537.215101626]: Failed to call message_info service. Proceeding without full message definition. [ WARN] [1472473537.215160529]: Advertising on topic [/chatter] with an empty message definition. Some tools (e.g. rosbag) may not work correctly. "Attached client is using protocol VER2 (hydro)" what does that mean? and what am I doing wrong here? please help.