samples: nrf_rpc: ps_client: fix BLE snippet after upmerge

The upmerge PR enabled BT_HCI for the protocols
serialization client sample, but the point of this sample
is to use BT_RPC_STACK, which enables RPC serialization
of Bluetooth host APIs, instead of the entire HCI-based
stack.

Restore the previous behavior and add necessary workarounds
to enable Bluetooth shell commands despite of not using
the HCI-based host implementation.

Signed-off-by: Damian Krolik <damian.krolik@nordicsemi.no>

Author: Damian-Nordic

samples/nrf_rpc/protocols_serialization/client/snippets/ble/ble.conf

@@ -16,8 +16,7 @@ CONFIG_BT_DEVICE_NAME="Nordic_UART_Service"
 CONFIG_BT_DEVICE_APPEARANCE=833
 CONFIG_BT_MAX_CONN=1
 CONFIG_BT_MAX_PAIRED=1
-CONFIG_BT_CTLR=n
-CONFIG_BT_HCI=y
+CONFIG_BT_LL_SOFTDEVICE=n
 CONFIG_BT_SHELL=y
 
 # Enable the NUS service

subsys/bluetooth/rpc/CMakeLists.txt

@@ -12,3 +12,8 @@ add_subdirectory(common)
 add_subdirectory_ifdef(CONFIG_BT_RPC_CLIENT client)
 add_subdirectory_ifdef(CONFIG_BT_RPC_HOST host)
 add_subdirectory(soc)
+
+# Host shell commands are only included in Zephyr for BT_HCI, the default stack implementation that
+# is mutually exclusive with BT_RPC_STACK, so the commands must be pulled in manually to make them
+# work with the RPC-based stack.
+add_subdirectory_ifdef(CONFIG_BT_SHELL ${ZEPHYR_BASE}/subsys/bluetooth/host/shell host/shell)

subsys/bluetooth/rpc/Kconfig

@@ -72,6 +72,13 @@ if BT_RPC_CLIENT
 config HEAP_MEM_POOL_SIZE
 	default 4096
 
+# BT_SHELL config in Zephyr depends on BT_HCI, the default stack implementation that is mutually
+# exclusive with BT_RPC_STACK, so this config must be duplicated to make shell commands work with
+# the RPC-based stack.
+config BT_SHELL
+	bool "Bluetooth shell"
+	select SHELL
+
 endif # BT_RPC_CLIENT
 
 if BT_RPC_HOST