tests: bluetooth: tester: add RFCOMM service support

Add RFCOMM service implementation to the Bluetooth tester framework,
enabling testing of RFCOMM protocol functionality over Bluetooth
Classic connections.

The implementation includes:
- RFCOMM DLC (Data Link Connection) management with support for up to
  10 concurrent channels and 5 server instances
- BTP (Bluetooth Test Protocol) command handlers for connect,
  disconnect, send data, listen, send RPN, and get DLC info operations
- Event notifications for connection state changes and data transfer
- Integration with the existing BTP service infrastructure

Enable RFCOMM support in the Bluetooth Classic test configuration.

Co-Author: Jiawei Yang <jiawei.yang_1@nxp.com>
Signed-off-by: Lyle Zhu <lyle.zhu@nxp.com>

Author: lylezhu2012

tests/bluetooth/tester/CMakeLists.txt

@@ -33,6 +33,10 @@ if(CONFIG_BT_OTS)
     target_sources(app PRIVATE src/btp_ots.c)
 endif()
 
+if(CONFIG_BT_RFCOMM)
+    target_sources(app PRIVATE src/btp_rfcomm.c)
+endif()
+
 zephyr_library_include_directories(src src/btp src/audio/btp)
 add_subdirectory_ifdef(CONFIG_BT_AUDIO src/audio)
 

tests/bluetooth/tester/prj_br.conf

@@ -13,3 +13,5 @@ CONFIG_BT_L2CAP_STREAM=y
 CONFIG_BT_L2CAP_FCS=y
 CONFIG_BT_L2CAP_EXT_WIN_SIZE=y
 CONFIG_BT_L2CAP_MAX_WINDOW_SIZE=5
+
+CONFIG_BT_RFCOMM=y

tests/bluetooth/tester/src/btp/btp.h

@@ -42,6 +42,7 @@
 #include "btp_ots.h"
 #include "btp_pbp.h"
 #include "btp_sdp.h"
+#include "btp_rfcomm.h"
 
 #define BTP_MTU 1024
 #define BTP_DATA_MAX_SIZE (BTP_MTU - sizeof(struct btp_hdr))
@@ -83,8 +84,9 @@
 #define BTP_SERVICE_ID_OTS      0x1d
 #define BTP_SERVICE_ID_PBP      0x1e
 #define BTP_SERVICE_ID_SDP      0x1f
+#define BTP_SERVICE_ID_RFCOMM   0x20
 
-#define BTP_SERVICE_ID_MAX	BTP_SERVICE_ID_SDP
+#define BTP_SERVICE_ID_MAX	BTP_SERVICE_ID_RFCOMM
 
 #define BTP_STATUS_SUCCESS	0x00
 #define BTP_STATUS_FAILED	0x01

tests/bluetooth/tester/src/btp/btp_rfcomm.h

@@ -0,0 +1,94 @@
+/* btp_rfcomm.h - Bluetooth RFCOMM tester headers */
+
+/*
+ * Copyright 2025 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <stdint.h>
+
+#include <zephyr/bluetooth/addr.h>
+
+/* RFCOMM Service */
+/* commands */
+#define BTP_RFCOMM_READ_SUPPORTED_COMMANDS		0x01
+struct btp_rfcomm_read_supported_commands_rp {
+	uint8_t data[0];
+} __packed;
+
+#define BTP_RFCOMM_CONNECT				0x02
+struct btp_rfcomm_connect_cmd {
+	bt_addr_le_t address;
+	uint8_t channel;
+} __packed;
+
+#define BTP_RFCOMM_DISCONNECT				0x03
+struct btp_rfcomm_disconnect_cmd {
+	bt_addr_le_t address;
+	uint8_t channel;
+} __packed;
+
+#define BTP_RFCOMM_SEND_DATA				0x04
+struct btp_rfcomm_send_data_cmd {
+	bt_addr_le_t address;
+	uint8_t channel;
+	uint16_t data_len;
+	uint8_t data[];
+} __packed;
+
+#define BTP_RFCOMM_LISTEN				0x05
+struct btp_rfcomm_listen_cmd {
+	uint8_t channel;
+} __packed;
+
+#define BTP_RFCOMM_SEND_RPN				0x06
+struct btp_rfcomm_send_rpn_cmd {
+	bt_addr_le_t address;
+	uint8_t channel;
+	uint8_t baud_rate;
+	uint8_t line_settings;
+	uint8_t flow_control;
+	uint8_t xon_char;
+	uint8_t xoff_char;
+	uint16_t param_mask;
+} __packed;
+
+#define BTP_RFCOMM_GET_DLC_INFO				0x07
+struct btp_rfcomm_get_dlc_info_cmd {
+	bt_addr_le_t address;
+	uint8_t channel;
+} __packed;
+struct btp_rfcomm_get_dlc_info_rp {
+	uint16_t mtu;
+	uint8_t state;
+} __packed;
+
+/* events */
+#define BTP_RFCOMM_EV_CONNECTED				0x80
+struct btp_rfcomm_connected_ev {
+	bt_addr_le_t address;
+	uint8_t channel;
+	uint16_t mtu;
+} __packed;
+
+#define BTP_RFCOMM_EV_DISCONNECTED			0x81
+struct btp_rfcomm_disconnected_ev {
+	bt_addr_le_t address;
+	uint8_t channel;
+} __packed;
+
+#define BTP_RFCOMM_EV_DATA_RECEIVED			0x82
+struct btp_rfcomm_data_received_ev {
+	bt_addr_le_t address;
+	uint8_t channel;
+	uint16_t data_length;
+	uint8_t data[];
+} __packed;
+
+#define BTP_RFCOMM_EV_DATA_SENT				0x83
+struct btp_rfcomm_data_sent_ev {
+	bt_addr_le_t address;
+	uint8_t channel;
+	int8_t err;
+} __packed;

tests/bluetooth/tester/src/btp/bttester.h

@@ -148,3 +148,6 @@ uint8_t tester_unregister_pbp(void);
 
 uint8_t tester_init_sdp(void);
 uint8_t tester_unregister_sdp(void);
+
+uint8_t tester_init_rfcomm(void);
+uint8_t tester_unregister_rfcomm(void);

tests/bluetooth/tester/src/btp_core.c

@@ -300,6 +300,11 @@ static uint8_t register_service(const void *cmd, uint16_t cmd_len,
 		status = tester_init_sdp();
 		break;
 #endif /* CONFIG_BT_CLASSIC */
+#if defined(CONFIG_BT_RFCOMM)
+	case BTP_SERVICE_ID_RFCOMM:
+		status = tester_init_rfcomm();
+		break;
+#endif /* CONFIG_BT_RFCOMM */
 	default:
 		LOG_WRN("unknown id: 0x%02x", cp->id);
 		status = BTP_STATUS_FAILED;
@@ -460,6 +465,11 @@ static uint8_t unregister_service(const void *cmd, uint16_t cmd_len,
 		status = tester_unregister_sdp();
 		break;
 #endif /* CONFIG_BT_CLASSIC */
+#if defined(CONFIG_BT_RFCOMM)
+	case BTP_SERVICE_ID_RFCOMM:
+		status = tester_unregister_rfcomm();
+		break;
+#endif /* CONFIG_BT_RFCOMM */
 	default:
 		LOG_WRN("unknown id: 0x%x", cp->id);
 		status = BTP_STATUS_FAILED;