Subscriber in sample_app of android_ndk not working

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

koeberlue
26 ●1 ●2 ●4

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
26 ●1 ●2 ●4

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)