2023-10-23 19:21:37 +02:00
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=====================
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2023-10-23 18:58:34 +02:00
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``poll`` Poll example
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=====================
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2023-10-21 12:24:43 +02:00
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A test of the ``poll()`` and ``select()`` APIs using FIFOs and, if available,
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``stdin``, and a TCP/IP socket. In order to use the TCP/IP select test, you must
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have the following things selected in your NuttX configuration file:
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- ``CONFIG_NET`` – Defined for general network support.
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- ``CONFIG_NET_TCP`` – Defined for TCP/IP support.
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- ``CONFIG_NET_NTCP_READAHEAD_BUFFERS`` – Defined to be greater than zero.
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- ``CONFIG_EXAMPLES_POLL_NOMAC`` – (May be defined to use software assigned
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MAC)
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- ``CONFIG_EXAMPLES_POLL_IPADDR`` – Target IP address.
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- ``CONFIG_EXAMPLES_POLL_DRIPADDR`` – Default router IP address.
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- ``CONFIG_EXAMPLES_POLL_NETMASK`` – Network mask.
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In order to for select to work with incoming connections, you must also select:
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- ``CONFIG_NET_TCPBACKLOG`` – Incoming connections pend in a backlog until
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``accept()`` is called.
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In additional to the target device-side example, there is also a host-side
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application in this directory. It can be compiled under Linux or Cygwin as
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follows::
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cd examples/usbserial
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make -f Makefile.host TOPDIR=<nuttx-directory> TARGETIP=<target-ip>
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Where ``<target-ip>`` is the IP address of your target board.
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This will generate a small program called 'host'. Usage:
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1. Build the ``examples/poll`` target program with TCP/IP poll support and start
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the target.
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2. Then start the host application::
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./host
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The host and target will exchange are variety of small messages. Each message
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sent from the host should cause the select to return in target. The target
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example should read the small message and send it back to the host. The host
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should then receive the echo'ed message.
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If networking is enabled, applications using this example will need to provide
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the following definition in the ``defconfig`` file to enable the networking
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library:
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- ``CONFIG_NETUTILS_NETLIB=y``
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