From f4cedfeb2655d39398aa7f1096a30d3312184bea Mon Sep 17 00:00:00 2001
From: beuchatp <beuchatp@control.ee.ethz.ch>
Date: Fri, 1 Dec 2017 07:08:23 +0100
Subject: [PATCH] Added echo to rostopic FAQ
---
pps_wiki/faq.md | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/pps_wiki/faq.md b/pps_wiki/faq.md
index db63466c..3fa72033 100644
--- a/pps_wiki/faq.md
+++ b/pps_wiki/faq.md
@@ -282,4 +282,10 @@ if (true)
my_subscriber = nodeHandle.subscribe("/fortytwo",1,fortytwoCallback);
}
```
-This would work if it is in the ``main()`` function of a node, but if it is in another function then you may need to declare the subscriber as a class variable.
\ No newline at end of file
+This would work if it is in the ``main()`` function of a node, but if it is in another function then you may need to declare the subscriber as a class variable.
+
+To observe any message published on a particular topic, after launching your node, open a separate command window and type the command:
+```
+rostopic echo /namespace/topicname
+```
+where ``/namespace/topicname`` needs to be replace with the topic that you wish to echo. Any messages received by this topic will be directly printed out in the command window.
\ No newline at end of file
--
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