.. zephyr:code-sample:: zbus-msg-subscriber
:name: Message subscriber
:relevant-api: zbus_apis
Use zbus message subscribers to listen to messages published to channels.
Overview
********
This sample illustrates how to use a message subscriber in different
ways in conjunction with other types of observers.
Building and Running
********************
This project outputs to the console. It can be built and executed
on QEMU as follows:
.. zephyr-app-commands::
:zephyr-app: samples/subsys/zbus/msg_subscriber
:host-os: unix
:board: qemu_x86
:goals: run
Sample Output
=============
.. code-block:: console
-- west build: running target run
[0/1] To exit from QEMU enter: 'CTRL+a, x'[QEMU] CPU: qemu32,+nx,+pae
Booting from ROM..
I: ----> Publishing to acc_data_chan channel
I: AL Memory allocated 28 bytes. Total allocated 28 bytes
I: From listener foo_lis -> Acc x=1, y=10, z=100
I: From msg subscriber bar_msg_sub1 -> Acc x=1, y=10, z=100
I: From msg subscriber bar_msg_sub2 -> Acc x=1, y=10, z=100
I: From msg subscriber bar_msg_sub3 -> Acc x=1, y=10, z=100
I: From msg subscriber bar_msg_sub4 -> Acc x=1, y=10, z=100
I: From msg subscriber bar_msg_sub5 -> Acc x=1, y=10, z=100
I: From msg subscriber bar_msg_sub6 -> Acc x=1, y=10, z=100
I: From msg subscriber bar_msg_sub7 -> Acc x=1, y=10, z=100
I: From msg subscriber bar_msg_sub8 -> Acc x=1, y=10, z=100
I: From msg subscriber bar_msg_sub9 -> Acc x=1, y=10, z=100
I: From msg subscriber bar_msg_sub10 -> Acc x=1, y=10, z=100
I: From msg subscriber bar_msg_sub11 -> Acc x=1, y=10, z=100
I: From msg subscriber bar_msg_sub12 -> Acc x=1, y=10, z=100
I: From msg subscriber bar_msg_sub13 -> Acc x=1, y=10, z=100
I: From msg subscriber bar_msg_sub14 -> Acc x=1, y=10, z=100
I: From msg subscriber bar_msg_sub15 -> Acc x=1, y=10, z=100
I: FR Memory freed 28 bytes. Total allocated 0 bytes
I: From msg subscriber bar_msg_sub16 -> Acc x=1, y=10, z=100
I: From subscriber bar_sub1 -> Acc x=1, y=10, z=100
I: From subscriber bar_sub2 -> Acc x=1, y=10, z=100
I: ----> Publishing to acc_data_chan channel
I: AL Memory allocated 28 bytes. Total allocated 28 bytes
I: From listener foo_lis -> Acc x=2, y=20, z=200
I: From msg subscriber bar_msg_sub1 -> Acc x=2, y=20, z=200
I: From msg subscriber bar_msg_sub2 -> Acc x=2, y=20, z=200
I: From msg subscriber bar_msg_sub3 -> Acc x=2, y=20, z=200
I: From msg subscriber bar_msg_sub4 -> Acc x=2, y=20, z=200
I: From msg subscriber bar_msg_sub5 -> Acc x=2, y=20, z=200
I: From msg subscriber bar_msg_sub6 -> Acc x=2, y=20, z=200
I: From msg subscriber bar_msg_sub7 -> Acc x=2, y=20, z=200
I: From msg subscriber bar_msg_sub8 -> Acc x=2, y=20, z=200
I: From msg subscriber bar_msg_sub9 -> Acc x=2, y=20, z=200
I: From msg subscriber bar_msg_sub10 -> Acc x=2, y=20, z=200
I: From msg subscriber bar_msg_sub11 -> Acc x=2, y=20, z=200
I: From msg subscriber bar_msg_sub12 -> Acc x=2, y=20, z=200
I: From msg subscriber bar_msg_sub13 -> Acc x=2, y=20, z=200
I: From msg subscriber bar_msg_sub14 -> Acc x=2, y=20, z=200
I: From msg subscriber bar_msg_sub15 -> Acc x=2, y=20, z=200
I: FR Memory freed 28 bytes. Total allocated 0 bytes
I: From msg subscriber bar_msg_sub16 -> Acc x=2, y=20, z=200
I: From subscriber bar_sub1 -> Acc x=2, y=20, z=200
I: From subscriber bar_sub2 -> Acc x=2, y=20, z=200
<continues>
Exit QEMU by pressing :kbd:`CTRL+A` :kbd:`x`.
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