samples: logging: Add support for UART over Bluetooth LE NUS

Tested and working with nrf52840dk/nrf52840.

Signed-off-by: Luis Ubieda <luisf@croxel.com>

samples/subsys/logging/logger/bt.overlay

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2024 Croxel, Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+ / {
+	chosen {
+		zephyr,console = &bt_nus_console_uart;
+	};
+
+	bt_nus_console_uart: bt_nus_console_uart {
+		compatible = "zephyr,nus-uart";
+		rx-fifo-size = <1024>;
+		tx-fifo-size = <1024>;
+	};
+};

samples/subsys/logging/logger/overlay-bt.conf

@@ -0,0 +1,16 @@
+CONFIG_SERIAL=y
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+
+CONFIG_BT=y
+CONFIG_BT_PERIPHERAL=y
+CONFIG_BT_NUS=y
+CONFIG_UART_BT=y
+CONFIG_BT_NUS_AUTO_START_BLUETOOTH=y
+
+# Bluetooth optimizations to allow larger data packets.
+CONFIG_BT_RX_STACK_SIZE=2048
+CONFIG_BT_L2CAP_TX_MTU=512
+CONFIG_BT_BUF_ACL_RX_SIZE=502
+CONFIG_BT_BUF_ACL_TX_SIZE=502
+CONFIG_BT_CTLR_DATA_LENGTH_MAX=251

samples/subsys/logging/logger/sample.yaml

@@ -29,6 +29,21 @@ tests:
       - CONFIG_LOG_BACKEND_RTT=y
       - CONFIG_USE_SEGGER_RTT=y
 
+  sample.logger.bt:
+    platform_allow:
+      - nrf52840dk/nrf52840
+    integration_platforms:
+      - nrf52840dk/nrf52840
+    tags:
+      - logging
+      - bluetooth
+    filter: CONFIG_DT_HAS_ZEPHYR_NUS_UART_ENABLED
+    arch_exclude:
+      - posix
+    extra_args:
+      - OVERLAY_CONFIG="overlay-bt.conf"
+      - DTC_OVERLAY_FILE="bt.overlay"
+
   sample.logger.usermode:
     integration_platforms:
       - mps2/an385