tests bsim/net: Add simple echo test over OpenThread

Expand the tests/bsim/net/sockets/echo_test
with a variant using OpenThread

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>

tests/bsim/net/compile.sh

@@ -23,4 +23,7 @@ source ${ZEPHYR_BASE}/tests/bsim/compile.source
 app=samples/net/sockets/echo_server conf_overlay=overlay-802154.conf compile
 app=tests/bsim/net/sockets/echo_test conf_overlay=overlay-802154.conf compile
 
+app=samples/net/sockets/echo_server conf_overlay=overlay-ot.conf compile
+app=tests/bsim/net/sockets/echo_test conf_overlay=overlay-ot.conf compile
+
 wait_for_background_jobs

tests/bsim/net/sockets/echo_test/boards/nrf52_bsim.conf

@@ -0,0 +1,4 @@
+# The nrf52 HW models do not have a flash model yet. Even though it is possible to use different
+# replacements, the easiest one is to disable the flash, so when configured with openthread
+# it will use the OPENTHREAD_SETTINGS_RAM
+CONFIG_FLASH=n

tests/bsim/net/sockets/echo_test/overlay-ot.conf

@@ -0,0 +1,43 @@
+# This file content is just a copy of the echo client overlay-ot.conf
+
+CONFIG_NEWLIB_LIBC=y
+
+# Disable TCP and IPv4 (TCP disabled to avoid heavy traffic)
+CONFIG_NET_TCP=n
+CONFIG_NET_IPV4=n
+
+CONFIG_NET_IPV6_NBR_CACHE=n
+CONFIG_NET_IPV6_MLD=n
+CONFIG_NET_CONFIG_NEED_IPV4=n
+CONFIG_NET_CONFIG_MY_IPV4_ADDR=""
+CONFIG_NET_CONFIG_PEER_IPV4_ADDR=""
+
+CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
+CONFIG_MAIN_STACK_SIZE=2560
+
+# Enable OpenThread shell
+CONFIG_SHELL=y
+CONFIG_OPENTHREAD_SHELL=y
+CONFIG_SHELL_STACK_SIZE=3072
+
+CONFIG_NET_L2_OPENTHREAD=y
+
+CONFIG_OPENTHREAD_DEBUG=y
+CONFIG_OPENTHREAD_L2_DEBUG=y
+CONFIG_OPENTHREAD_L2_LOG_LEVEL_INF=y
+
+CONFIG_OPENTHREAD_CHANNEL=26
+CONFIG_OPENTHREAD_NETWORKKEY="00:11:22:33:44:55:66:77:88:99:aa:bb:cc:dd:ee:ff"
+
+CONFIG_NET_CONFIG_MY_IPV6_ADDR="fdde:ad00:beef::1"
+CONFIG_NET_CONFIG_PEER_IPV6_ADDR="fdde:ad00:beef::2"
+
+# mbedTLS tweaks
+CONFIG_MBEDTLS_SSL_MAX_CONTENT_LEN=768
+
+# A sample configuration to enable Thread Joiner, uncomment if needed
+#CONFIG_OPENTHREAD_JOINER=y
+#CONFIG_OPENTHREAD_JOINER_AUTOSTART=y
+
+# Enable diagnostic module, uncomment if needed
+#CONFIG_OPENTHREAD_DIAG=y

tests/bsim/net/sockets/echo_test/src/echo_test.c

@@ -12,7 +12,13 @@
 
 #include "common.h" /* From echo_client */
 
+#if defined(CONFIG_NET_L2_OPENTHREAD)
+/* Open thread takes ~15 seconds to connect in ideal conditions */
+#define WAIT_TIME 25 /* Seconds */
+#else
 #define WAIT_TIME 20 /* Seconds */
+#endif
+
 #define PASS_THRESHOLD 100 /* Packets */
 
 extern enum bst_result_t bst_result;

tests/bsim/net/sockets/echo_test/tests_scripts/echo_test_ot.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+# Copyright 2018 Oticon A/S
+# Copyright 2023 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+# Simple selfchecking test for openthread, based on the echo client / server sample apps
+# It relies on the bs_tests hooks to register a test timer callback, which after a deadline
+# will check how many packets the echo client has got back as expected, and if over a threshold
+# it considers the test passed
+
+simulation_id="echo_test_ot"
+verbosity_level=2
+
+source ${ZEPHYR_BASE}/tests/bsim/sh_common.source
+
+EXECUTE_TIMEOUT=100
+
+cd ${BSIM_OUT_PATH}/bin
+
+Execute ./bs_${BOARD}_tests_bsim_net_sockets_echo_test_prj_conf_overlay-ot_conf \
+  -v=${verbosity_level} -s=${simulation_id} -d=0 -RealEncryption=1 \
+  -testid=echo_client
+
+Execute ./bs_${BOARD}_samples_net_sockets_echo_server_prj_conf_overlay-ot_conf\
+  -v=${verbosity_level} -s=${simulation_id} -d=1 -RealEncryption=1 \
+
+Execute ./bs_2G4_phy_v1 -v=${verbosity_level} -s=${simulation_id} \
+  -D=2 -sim_length=60e6 -argschannel -at=40 $@
+
+wait_for_background_jobs #Wait for all programs in background and return != 0 if any fails