tests: bluetooth: BSim peripherals disconnect regression test

A test script to be used as a regression test for the issue
zephyrproject-rtos#52393

It covers the disconnect issue when Central connects to more than one
peripheral with the following setup:

Central connects to 4 peripherals
- Enable encryption
- MTU is set to 247
- Connection interval is set 25 ms
- Notify (~200 bytes) from both sides in a loop
- Notifications are sent in both directions between the central and the
  connected peripherals with 243 data size

Signed-off-by: Ahmed Moheb <ahmed.moheb@nordicsemi.no>

tests/bluetooth/bsim_bt/bsim_test_conn_stress/tests_scripts/conn_stress_disconnect_issue_regression.sh

@@ -0,0 +1,87 @@
+#!/usr/bin/env bash
+# Copyright (c) 2022 Nordic Semiconductor
+# SPDX-License-Identifier: Apache-2.0
+
+# EATT test
+simulation_id="conn_stress"
+process_ids=""; exit_code=0
+
+function Execute(){
+  if [ ! -f $1 ]; then
+    echo -e "ERR! \e[91m`pwd`/`basename $1` cannot be found (did you forget to\
+ compile it?)\e[39m"
+    exit 1
+  fi
+  # timeout 30 $@ & process_ids="$process_ids $!"
+  $@ & process_ids="$process_ids $!"
+
+  echo "Running $@"
+}
+
+: "${BSIM_OUT_PATH:?BSIM_OUT_PATH must be defined}"
+
+#Give a default value to BOARD if it does not have one yet:
+BOARD="${BOARD:-nrf52_bsim}"
+
+testing_apps_loc="${ZEPHYR_BASE}/tests/bluetooth/bsim_bt/bsim_test_conn_stress"
+central_app_name="central"
+peripheral_app_name="peripheral"
+bsim_central_exe_name="bs_nrf52_bsim_bluetooth_central"
+bsim_peripheral_exe_name="bs_nrf52_bsim_bluetooth_peripheral"
+
+cd ${testing_apps_loc}
+
+if [ ! -d "${central_app_name}" -o ! -d "${peripheral_app_name}" ]; then
+    echo -e "ERR! \e[91mOne or more test applications couldn't be found\e[39m"
+    exit 1
+fi
+
+#Remove old builds if they exist
+find . -type d -name 'build' -exec rm -rf {} +
+
+cd "${testing_apps_loc}/${central_app_name}"
+west build -b ${BOARD} .
+cp build/zephyr/zephyr.exe ${BSIM_OUT_PATH}/bin/${bsim_central_exe_name}
+
+cd "${testing_apps_loc}/${peripheral_app_name}"
+west build -b ${BOARD} .
+cp build/zephyr/zephyr.exe ${BSIM_OUT_PATH}/bin/${bsim_peripheral_exe_name}
+
+cd ${BSIM_OUT_PATH}/bin
+
+if [ ! -f "${bsim_central_exe_name}" -o ! -f "${bsim_peripheral_exe_name}" ]; then
+    echo -e "ERR! \e[91mOne or more test executables couldn't be found\e[39m"
+    exit 1
+fi
+
+find ../ -type d -name ${simulation_id} -exec rm -rf {} +
+
+bsim_args="-RealEncryption=1 -v=2 -s=${simulation_id}"
+test_args="-argstest notify_size=243 conn_interval=20"
+
+Execute "./${bsim_central_exe_name}" ${bsim_args} -d=0 -rs=915 -testid=central ${test_args}
+Execute "./${bsim_peripheral_exe_name}" ${bsim_args} -d=1 -rs=710 -testid=peripheral ${test_args}
+Execute "./${bsim_peripheral_exe_name}" ${bsim_args} -d=2 -rs=175 -testid=peripheral ${test_args}
+Execute "./${bsim_peripheral_exe_name}" ${bsim_args} -d=3 -rs=703 -testid=peripheral ${test_args}
+Execute "./${bsim_peripheral_exe_name}" ${bsim_args} -d=4 -rs=213 -testid=peripheral ${test_args}
+Execute ./bs_2G4_phy_v1 -dump -v=2 -s=${simulation_id} -D=5 -sim_length=850e6 &
+
+for process_id in $process_ids; do
+  wait $process_id || let "exit_code=$?"
+done
+
+find . -type f -name ${bsim_central_exe_name} -delete
+find . -type f -name ${bsim_peripheral_exe_name} -delete
+
+${BSIM_OUT_PATH}/components/ext_2G4_phy_v1/dump_post_process/csv2pcap -o \
+${BSIM_OUT_PATH}/results/${simulation_id}/Trace_Tx.pcap \
+${BSIM_OUT_PATH}/results/${simulation_id}/d_2G4*.Tx.csv
+
+${BSIM_OUT_PATH}/components/ext_2G4_phy_v1/dump_post_process/csv2pcap -o \
+${BSIM_OUT_PATH}/results/${simulation_id}/Trace_Rx.pcap \
+${BSIM_OUT_PATH}/results/${simulation_id}/d_2G4*.Rx.csv
+
+echo "${BSIM_OUT_PATH}/results/${simulation_id}/Trace_Tx.pcap"
+echo "${BSIM_OUT_PATH}/results/${simulation_id}/Trace_Rx.pcap"
+
+exit $exit_code