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Subscriber in sample_app of android_ndk not working

asked 2016-09-07 04:52:01 -0500

koeberlue gravatar image

Hello everybody,

I'm currently trying to port a c++ Desktop Applicatioon to Android. I have been able to build the andoird_ndk sample app following this tutorial: http://wiki.ros.org/android_ndk/Tutor...

But when I start the app and publish a message from my workstation as described in the tutorial, the callback is never called, as i have verified with logcat.

To check the general connection, i have modified the test.cpp file to publish a single message before entering the while-loop and i am able to receive this message on my workstation.

Does anyone have an idea, what could cause this issue?

(Since I'm new to ROS, tell me if you need further information)

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answered 2016-09-15 09:45:18 -0500

koeberlue gravatar image

After some debugging i found out that my network was not set up properly. I had to set the ROS_IP environment variable to my local ip.

For further information read http://wiki.ros.org/ROS/NetworkSetup

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hi everyone,i have the same problem,when i run roswtf,it says:

Found 1 error(s).

ERROR The following nodes should be connected but aren't:
 * /rosjava/talker->/android_ndk_native_cpp (/chatter)
 * /rostopic_7280_1486193220744->/android_ndk_native_cpp (/chatter)
xy1zzz gravatar image xy1zzz  ( 2017-02-04 01:32:27 -0500 )edit
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answered 2017-02-04 13:02:11 -0500

xy1zzz gravatar image

updated 2017-02-04 13:03:16 -0500

I have the same problem that cannot ping each other by name and solve this problem by doing this:

1.In ros master PC shell setup ROS_IP before you run roscore service 10.0.0.14 is your local ip.

u64@u64-rosmaster:~$ export ROS_IP=10.0.0.14

u64@u64-rosmaster:~$ roscore

2.edit ros master PC /etc/hosts add your phone ip and name like

10.0.0.15 phone

good luck!

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Asked: 2016-09-07 04:52:01 -0500

Seen: 123 times

Last updated: Feb 04 '17