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https://github.com/zephyrproject-rtos/zephyr
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Some of the socket samples had wrong information about what default board to use. Currently there is no default board and user must select the board when building the application. Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
78 lines
2.2 KiB
ReStructuredText
78 lines
2.2 KiB
ReStructuredText
.. _async-sockets-echo-select-sample:
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Asynchronous Socket Echo Server Using select()
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##############################################
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Overview
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********
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The sockets/echo_async_select sample application for Zephyr implements an
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asynchronous IPv4/IPv6 TCP echo server using a BSD Sockets compatible API
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with non-blocking sockets and a ``select()`` call. This is a variant of
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the :ref:`async-sockets-echo-sample` sample.
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The source code for this sample application can be found at:
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:zephyr_file:`samples/net/sockets/echo_async_select`.
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Requirements
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************
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- :ref:`networking_with_host`
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- or, a board with hardware networking (including 6LoWPAN)
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Building and Running
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********************
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Build the Zephyr version of the sockets/echo_async application like this:
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.. zephyr-app-commands::
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:zephyr-app: samples/net/sockets/echo_async_select
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:board: <board_to_use>
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:goals: build
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:compact:
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After the sample starts, it expects connections at 192.0.2.1 (IPv4), or
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2001:db8::1 (IPv6), port 4242. The easiest way to connect is:
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.. code-block:: console
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$ telnet 192.0.2.1 4242 # use this for IPv4
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$ telnet 2001:db8::1 4242 # or this for IPv6
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After a connection is made, the application will echo back any line sent to
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it. Unlike the :ref:`sockets-echo-sample`, this application
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supports multiple concurrent client connections. You can open
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another terminal window and run the same telnet command as above.
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The sample supports up to three connected clients, but this can be adjusted
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by changing ``NUM_FDS`` defined in the source code.
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Running application on POSIX Host
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=================================
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The same application source code can be built for a POSIX system, e.g.
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Linux. (Note: if you look at the source, you will see that the code is
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the same except the header files are different for Zephyr vs POSIX, and
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there's an additional option to set for Linux to make a socket IPv6-only).
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To build for a host POSIX OS:
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.. code-block:: console
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$ make -f Makefile.posix
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To run:
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.. code-block:: console
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$ ./socket_echo
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To test:
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.. code-block:: console
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$ telnet 127.0.0.1 4242 # use this for IPv4
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$ telnet ::1 4242 # or this for IPv6
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As can be seen, the behavior of the application is the same as the Zephyr
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version.
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