samples: Bluetooth: Remove duplicate board conf for iso_broadcast

Remove duplicated board specific conf file for iso_broadcast
and iso_receive samples. Instead, have an overlay conf file.

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

Author: cvinayak

samples/bluetooth/iso_broadcast/README.rst

@@ -21,7 +21,8 @@ Building and Running
 ********************
 
 This sample can be found under :zephyr_file:`samples/bluetooth/iso_broadcast` in
-the Zephyr tree.
+the Zephyr tree. Use `-DOVERLAY_CONFIG=overlay-bt_ll_sw_split.conf` to enable
+required ISO feature support in Zephyr Bluetooth Controller on supported boards.
 
 Use the sample found under :zephyr_file:`samples/bluetooth/iso_receive` in the
 Zephyr tree that will scan, establish a periodic advertising synchronization,

samples/bluetooth/iso_broadcast/boards/nrf21540dk_nrf52840.conf

@@ -0,0 +1,13 @@
+CONFIG_BT_CTLR_ADV_ISO=y
+CONFIG_BT_CTLR_ADV_ISO_PDU_LEN_MAX=4
+CONFIG_BT_CTLR_ADV_ISO_STREAM_MAX=2
+
+CONFIG_BT_CTLR_ISOAL_SOURCES=2
+
+# FIXME: Host needs CONFIG_BT_ISO_TX_MTU + 4 bytes for sequence number, and
+# optionally additional + 4 bytes for timestamp when not using
+# BT_ISO_TIMESTAMP_NONE in bt_iso_chan_send(), otherwise Host tries to fragment
+# ISO data.
+# When Host is fixed, CONFIG_BT_CTLR_ISO_TX_BUFFER_SIZE can inherit the
+# CONFIG_BT_ISO_TX_MTU value.
+CONFIG_BT_CTLR_ISO_TX_BUFFER_SIZE=12

samples/bluetooth/iso_broadcast/boards/nrf52840dk_nrf52840.conf

@@ -4,9 +4,7 @@ CONFIG_BT_DEBUG_LOG=y
 CONFIG_BT_DEVICE_NAME="Test ISO Broadcaster"
 
 CONFIG_BT_ISO_MAX_CHAN=2
-CONFIG_BT_ISO_TX_BUF_COUNT=2
+CONFIG_BT_ISO_TX_BUF_COUNT=4
 
 # Just needs to send a uint32_t value
-CONFIG_BT_ISO_TX_MTU=23
-
-CONFIG_BT_CTLR_ISO_TX_BUFFERS=2
+CONFIG_BT_ISO_TX_MTU=4

samples/bluetooth/iso_broadcast/boards/nrf52_bsim.conf

@@ -7,3 +7,10 @@ tests:
     integration_platforms:
       - qemu_cortex_m3
     tags: bluetooth
+  sample.bluetooth.iso_broadcast.bt_ll_sw_split:
+    harness: bluetooth
+    platform_allow: qemu_cortex_m3 qemu_x86 nrf52_bsim nrf52dk_nrf52832
+    integration_platforms:
+      - nrf52dk_nrf52832
+    extra_args: OVERLAY_CONFIG=overlay-bt_ll_sw_split.conf
+    tags: bluetooth

samples/bluetooth/iso_broadcast/boards/nrf52dk_nrf52832.conf

@@ -21,7 +21,8 @@ Building and Running
 ********************
 
 This sample can be found under :zephyr_file:`samples/bluetooth/iso_receive` in
-the Zephyr tree.
+the Zephyr tree. Use `-DOVERLAY_CONFIG=overlay-bt_ll_sw_split.conf` to enable
+required ISO feature support in Zephyr Bluetooth Controller on supported boards.
 
 Use the sample found under :zephyr_file:`samples/bluetooth/iso_broadcast` on
 another board that will start periodic advertising, create BIG to which this