tests: Bluetooth: bsim: Add test for auto connection parameter update

Add BabbleSim test to cover the automatic preferred
peripheral connection parameter requests across multiple
simultaneous connections.

Signed-off-by: Vinayak Kariappa Chettimada <[email protected]>

Author: cvinayak

tests/bsim/bluetooth/ll/compile.sh

@@ -48,5 +48,6 @@ app=tests/bsim/bluetooth/ll/multiple_id compile
 app=tests/bsim/bluetooth/ll/throughput compile
 
 app=tests/bsim/bluetooth/ll/conn_param compile
+app=tests/bsim/bluetooth/ll/conn_param conf_file=prj-ll_sw_llcp_legacy.conf compile
 
 wait_for_background_jobs

tests/bsim/bluetooth/ll/conn_param/prj-ll_sw_llcp_legacy.conf

@@ -0,0 +1,57 @@
+CONFIG_BT=y
+CONFIG_BT_PERIPHERAL=y
+CONFIG_BT_CENTRAL=y
+
+CONFIG_BT_DEVICE_NAME="Zephyr Conn Param"
+
+CONFIG_BT_USER_PHY_UPDATE=y
+CONFIG_BT_AUTO_PHY_UPDATE=y
+CONFIG_BT_USER_DATA_LEN_UPDATE=y
+CONFIG_BT_AUTO_DATA_LEN_UPDATE=y
+
+CONFIG_BT_GAP_AUTO_UPDATE_CONN_PARAMS=y
+CONFIG_BT_PERIPHERAL_PREF_MIN_INT=41
+CONFIG_BT_PERIPHERAL_PREF_MAX_INT=41
+CONFIG_BT_PERIPHERAL_PREF_LATENCY=0
+CONFIG_BT_PERIPHERAL_PREF_TIMEOUT=31
+
+CONFIG_BT_CONN_PARAM_UPDATE_TIMEOUT=30000
+CONFIG_BT_CONN_PARAM_RETRY_COUNT=10
+CONFIG_BT_CONN_PARAM_RETRY_TIMEOUT=1000
+
+CONFIG_BT_MAX_CONN=5
+CONFIG_BT_ID_MAX=5
+
+# L2CAP, ATT and SMP may cause data transmission deadlock due to shortage
+# of buffers when transactions crossover amongst the connections in the same
+# device.
+
+CONFIG_BT_GATT_CLIENT=y
+
+# CONFIG_BT_SMP=y
+# CONFIG_BT_MAX_PAIRED=250
+# CONFIG_BT_PRIVACY=y
+
+CONFIG_BT_L2CAP_TX_MTU=247
+
+CONFIG_BT_BUF_CMD_TX_SIZE=255
+CONFIG_BT_BUF_EVT_RX_SIZE=255
+CONFIG_BT_BUF_EVT_DISCARDABLE_SIZE=255
+CONFIG_BT_BUF_ACL_TX_SIZE=251
+CONFIG_BT_BUF_ACL_TX_COUNT=5
+CONFIG_BT_BUF_ACL_RX_SIZE=251
+
+CONFIG_BT_LL_SW_LLCP_LEGACY=y
+CONFIG_BT_CTLR_DATA_LENGTH_MAX=251
+
+# Each PHY update can pause connections for 6 interval hence to let other
+# parallel connection establishment to succeed increase Rx buffer count.
+CONFIG_BT_CTLR_RX_BUFFERS=6
+
+# Provide enough spacing between connections so that multiple peripheral roles
+# when connected to a single peer device (peripheral_identity sample) have
+# room for window widening and do not overlap with each other in that single
+# peer device. This can be tuned based on connection interval and clock
+# accuracy, current value here is sufficient for 500ppm at 1 second interval.
+CONFIG_BT_CTLR_ADVANCED_FEATURES=y
+CONFIG_BT_CTLR_CENTRAL_SPACING=3000

tests/bsim/bluetooth/ll/conn_param/tests_scripts/conn_param_legacy.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+# Copyright 2018 Oticon A/S
+# SPDX-License-Identifier: Apache-2.0
+
+source ${ZEPHYR_BASE}/tests/bsim/sh_common.source
+
+# Basic connection test: a central connects to a peripheral and expects a
+# notification, using the split controller (ULL LLL)
+simulation_id="conn_param_legacy"
+verbosity_level=2
+EXECUTE_TIMEOUT=900
+
+cd ${BSIM_OUT_PATH}/bin
+
+Execute ./bs_${BOARD_TS}_tests_bsim_bluetooth_ll_conn_param_prj-ll_sw_llcp_legacy_conf \
+  -v=${verbosity_level} -s=${simulation_id} -d=0 -RealEncryption=1 -testid=central
+
+Execute ./bs_${BOARD_TS}_tests_bsim_bluetooth_ll_conn_param_prj-ll_sw_llcp_legacy_conf \
+  -v=${verbosity_level} -s=${simulation_id} -d=1 -RealEncryption=1 -testid=peripheral
+
+Execute ./bs_2G4_phy_v1 -v=${verbosity_level} -s=${simulation_id} \
+  -D=2 -sim_length=1200e6 $@ -argschannel -at=40
+
+wait_for_background_jobs