ROS Topics Watcher

Inspired by py-trees-blackboard-watcher, ros-topics-watcher is a wrap on top of rostopic echo tool, that prints out values only if they change. In addition it also allows subscribing to multiple topics and multiple fields/attributes of the message.

Examples

$ ros-topics-watcher -l

Published topics:
 * /foo [std_msgs/Header] 1 publisher
 * /bar [std_msgs/Header] 1 publisher
 * /rosout_agg [rosgraph_msgs/Log] 1 publisher

$ ros-topics-watcher /foo/seq
/foo/seq: 0
---

$ ros-topics-watcher /foo/seq /bar/stamp/nsecs
/foo/seq: 0
---
/bar/stamp/nsecs: 34739017
---
/bar/stamp/nsecs: 134696006
---
/bar/stamp/nsecs: 234863996
---
/bar/stamp/nsecs: 334772109
---
/bar/stamp/nsecs: 434758901
---
/bar/stamp/nsecs: 534750938
---
/bar/stamp/nsecs: 634763956
---

$ ros-topics-watcher /color[r,g]
/color[r, g]:
g: 0.0
r: 0.0

---

$ ros-topics-watcher header[seq,stamp.secs]
/header[seq, stamp.secs]:
seq: 0
stamp.secs: 1603641830

---
/header[seq, stamp.secs]:
seq: 0
stamp.secs: 1603641831

---
/header[seq, stamp.secs]:
seq: 0
stamp.secs: 1603641832

---
/header[seq, stamp.secs]:
seq: 0
stamp.secs: 1603641833

---