.. zephyr:code-sample:: zbus-uart-bridge
:name: UART bridge
:relevant-api: zbus_apis
Redirect channel events to the host over UART.
Overview
********
This simple application demonstrates a UART redirection of all channel events to the host.
The device sends information to the script running on a computer host. The script decodes it and prints it to the stdout.
Building and Running
********************
This project outputs to the console. It can be built and executed
on native_sim as follows:
.. zephyr-app-commands::
:zephyr-app: samples/subsys/zbus/uart_bridge
:host-os: unix
:board: native_sim
:goals: run
Sample Output
=============
.. code-block:: console
[0/1] cd .../zephyr/build/zephyr/zephyr.exe
uart_1 connected to pseudotty: /dev/pts/2
uart connected to pseudotty: /dev/pts/3
*** Booting Zephyr OS build zephyr-v3.1.0 ***
D: Core sending start measurement with status 0
D: START processing channel start_measurement change
D: FINISH processing channel start_measurement change
D: Peripheral sending sensor data
D: START processing channel sensor_data change
D: FINISH processing channel sensor_data change
D: Bridge Started
D: Channel start_measurement claimed
D: Channel start_measurement finished
D: Bridge send start_measurement
D: Channel sensor_data claimed
D: Channel sensor_data finished
D: Bridge send sensor_data
D: Core sending start measurement with status 1
D: START processing channel start_measurement change
D: FINISH processing channel start_measurement change
D: Channel start_measurement claimed
D: Channel start_measurement finished
D: Bridge send start_measurement
D: Peripheral sending sensor data
D: START processing channel sensor_data change
D: FINISH processing channel sensor_data change
D: Channel sensor_data claimed
D: Channel sensor_data finished
D: Bridge send sensor_data
<repeats endlessly>
Exit execution by pressing :kbd:`CTRL+C`.
The :file:`decoder.py` script can be executed using the following command:
.. code-block:: bash
python3.8 samples/subsys/zbus/uart_bridge/decoder.py /dev/pts/2
Note the run command above prints the value of pts port because it is running in
:ref:`native_sim <native_sim>`.
Look at the line indicating ``uart_1 connected to pseudotty: /dev/pts/2``.
It can be different in your case. If you are using a board, read the documentation to get the
correct port destination (in Linux is something like ``/dev/tty...`` or in Windows ``COM...``).
From the serial decoder (Python script), you would see something like this:
.. code-block:: shell
PUB [sensor_data] -> b'\xc5\x01\x00\x00\xb2\x11\x00\x00'
PUB [start_measurement] -> b'\x00'
PUB [sensor_data] -> b'\xc6\x01\x00\x00\xbc\x11\x00\x00'
PUB [start_measurement] -> b'\x01'
PUB [sensor_data] -> b'\xc7\x01\x00\x00\xc6\x11\x00\x00'
PUB [start_measurement] -> b'\x00'
PUB [sensor_data] -> b'\xc8\x01\x00\x00\xd0\x11\x00\x00'
PUB [start_measurement] -> b'\x01'
PUB [sensor_data] -> b'\xc9\x01\x00\x00\xda\x11\x00\x00'
PUB [start_measurement] -> b'\x00'
PUB [sensor_data] -> b'\xca\x01\x00\x00\xe4\x11\x00\x00'
PUB [start_measurement] -> b'\x01'
PUB [sensor_data] -> b'\xcb\x01\x00\x00\xee\x11\x00\x00'
PUB [start_measurement] -> b'\x00'
PUB [sensor_data] -> b'\xcc\x01\x00\x00\xf8\x11\x00\x00'
PUB [start_measurement] -> b'\x01'
PUB [sensor_data] -> b'\xcd\x01\x00\x00\x02\x12\x00\x00'
PUB [start_measurement] -> b'\x00'
PUB [sensor_data] -> b'\xce\x01\x00\x00\x0c\x12\x00\x00'
PUB [start_measurement] -> b'\x01'
PUB [sensor_data] -> b'\xcf\x01\x00\x00\x16\x12\x00\x00'
PUB [start_measurement] -> b'\x00'
Exit the decoder script by pressing :kbd:`CTRL+C`.
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