Echo Server¶
Overview¶
The echo-server sample application for Zephyr implements a UDP/TCP server that complements the echo-client sample application: the echo-server listens for incoming IPv4 or IPv6 packets (sent by the echo client) and simply sends them back.
The source code for this sample application can be found at:
samples/net/echo_server
.
Requirements¶
Building and Running¶
There are multiple ways to use this application. One of the most common usage scenario is to run echo-server application inside QEMU. This is described in Networking with QEMU.
There are configuration files for different boards and setups in the echo-server directory:
prj_arduino_101_cc2520.conf
Use this for Arduino 101 with external IEEE 802.15.4 cc2520 board.prj_arduino_101.conf
Use this for Arduino 101 with external enc28j60 ethernet board.prj_bt.conf
Use this for Bluetooth IPSP connectivity.prj_cc2520.conf
Use this for devices that have support for IEEE 802.15.4 cc2520 chip.prj_frdm_k64f_cc2520.conf
Use this for FRDM-K64F board with external IEEE 802.15.4 cc2520 board.prj_frdm_k64f.conf
Use this for FRDM-K64F board with built-in ethernet.prj_frdm_k64f_mcr20a.conf
Use this for FRDM-K64F board with IEEE 802.15.4 mcr20a board.prj_qemu_802154.conf
Use this when simulating IEEE 802.15.4 network using two QEMU’s that are connected together.prj_qemu_cortex_m3.conf
Use this for ARM QEMU.prj_qemu_x86.conf
Use this for x86 QEMU.prj_sam_e70_xplained.conf
Use this for Atmel SMART SAM E70 Xplained board with ethernet.
Build echo-server sample application like this:
$ cd $ZEPHYR_BASE/samples/net/echo_server
$ make pristine && make CONF_FILE=<your desired conf file> \
BOARD=<board to use>
Make can select the default configuration file based on the BOARD you’ve specified automatically so you might not always need to mention it.
Running echo-client in Linux Host¶
There is one useful testing scenario that can be used with Linux host. Here echo-server is run in QEMU and echo-client is run in Linux host.
To use QEMU for testing, follow the Networking with QEMU guide.
Run echo-server application in QEMU:
$ cd $ZEPHYR_BASE/samples/net/echo_server
$ make pristine && make qemu
In a terminal window:
$ sudo ./echo-client -i tap0 2001:db8::1
Note that echo-server must be running in QEMU before you start the echo-client application in host terminal window.