Echo Client

Overview

The echo-client sample application for Zephyr implements a UDP/TCP client that will send IPv4 or IPv6 packets, wait for the data to be sent back, and then verify it matches the data that was sent.

The source code for this sample application can be found at: samples/net/echo_client.

Building and Running

There are multiple ways to use this application. One of the most common usage scenario is to run echo-client application inside QEMU. This is described in networking with QEMU.

There are configuration files for different boards and setups in the echo-client 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-client sample application like this:

$ cd $ZEPHYR_BASE/samples/net/echo_client
$ 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-server Linux Host

There is one useful testing scenario that can be used with Linux host. Here echo-client is run in QEMU and echo-server is run in Linux host.

Run ‘loop_socat’ and ‘loop-slip-tap’ scripts from net-tools in Linux host.

$ ./loop_socat.sh

In another window:

$ sudo ./loop-slip-tap.sh

In third window:

$ sudo ./echo-server -i tap0

Run echo-client application in QEMU:

$ cd $ZEPHYR_BASE/samples/net/echo-client
$ make pristine && make qemu