feat: 添加蓝牙串口模块支持

- 添加 ble_serial_module.c 实现蓝牙串口功能
- 添加 ble_serial_rx_event 和 ble_serial_tx_event 事件定义及实现
- 在 CMakeLists.txt 中注册新的源文件和事件
- 配置蓝牙 L2CAP MTU 和缓冲区大小参数
- 修改 usb_cdc_test_module 支持通过蓝牙发送测试消息
- 实现蓝牙连接状态管理及数据收发功能

src/usb_cdc_test_module.c

@@ -7,9 +7,12 @@
 #include <caf/events/module_state_event.h>
 #include <caf/events/power_event.h>
 
+#include <caf/events/ble_common_event.h>
+
 #include <zephyr/kernel.h>
 #include <zephyr/logging/log.h>
 
+#include "ble_serial_tx_event.h"
 #include "usb_cdc_tx_event.h"
 #include "usb_device_state_event.h"
 
@@ -18,11 +21,13 @@ LOG_MODULE_REGISTER(MODULE, LOG_LEVEL_INF);
 #define USB_CDC_TEST_PERIOD K_SECONDS(1)
 
 static const uint8_t hello_message[] = "hello\r\n";
+static const uint8_t ble_hello_message[] = "ble_hello\r\n";
 
 static struct k_work_delayable hello_work;
 static bool initialized;
 static bool running;
 static bool usb_active;
+static bool ble_active;
 
 static void submit_hello_message(void)
 {
@@ -33,15 +38,31 @@ static void submit_hello_message(void)
 	APP_EVENT_SUBMIT(event);
 }
 
+static void submit_ble_hello_message(void)
+{
+	struct ble_serial_tx_event *event =
+		new_ble_serial_tx_event(sizeof(ble_hello_message) - 1U);
+
+	memcpy(event->dyndata.data, ble_hello_message, sizeof(ble_hello_message) - 1U);
+	APP_EVENT_SUBMIT(event);
+}
+
 static void hello_work_handler(struct k_work *work)
 {
 	ARG_UNUSED(work);
 
-	if (!running || !usb_active) {
+	if (!running) {
 		return;
 	}
 
-	submit_hello_message();
+	if (usb_active) {
+		submit_hello_message();
+	}
+
+	if (ble_active) {
+		submit_ble_hello_message();
+	}
+
 	k_work_reschedule(&hello_work, USB_CDC_TEST_PERIOD);
 }
 
@@ -58,7 +79,7 @@ static int module_start(void)
 	}
 
 	running = true;
-	if (usb_active) {
+	if (usb_active || ble_active) {
 		k_work_reschedule(&hello_work, USB_CDC_TEST_PERIOD);
 	}
 
@@ -98,12 +119,56 @@ static bool handle_usb_device_state_event(const struct usb_device_state_event *e
 	return false;
 }
 
+static bool handle_ble_peer_event(const struct ble_peer_event *event)
+{
+	bool new_ble_active = ble_active;
+
+	switch (event->state) {
+	case PEER_STATE_CONNECTED:
+		new_ble_active = false;
+		break;
+
+	case PEER_STATE_SECURED:
+		new_ble_active = true;
+		break;
+
+	case PEER_STATE_DISCONNECTED:
+		new_ble_active = false;
+		break;
+
+	default:
+		return false;
+	}
+
+	if (new_ble_active == ble_active) {
+		return false;
+	}
+
+	ble_active = new_ble_active;
+
+	if (!running) {
+		return false;
+	}
+
+	if (usb_active || ble_active) {
+		k_work_reschedule(&hello_work, USB_CDC_TEST_PERIOD);
+	} else {
+		k_work_cancel_delayable(&hello_work);
+	}
+
+	return false;
+}
+
 static bool app_event_handler(const struct app_event_header *aeh)
 {
 	if (is_usb_device_state_event(aeh)) {
 		return handle_usb_device_state_event(cast_usb_device_state_event(aeh));
 	}
 
+	if (is_ble_peer_event(aeh)) {
+		return handle_ble_peer_event(cast_ble_peer_event(aeh));
+	}
+
 	if (is_module_state_event(aeh)) {
 		const struct module_state_event *event = cast_module_state_event(aeh);
 
@@ -159,6 +224,7 @@ static bool app_event_handler(const struct app_event_header *aeh)
 
 APP_EVENT_LISTENER(MODULE, app_event_handler);
 APP_EVENT_SUBSCRIBE(MODULE, module_state_event);
+APP_EVENT_SUBSCRIBE(MODULE, ble_peer_event);
 APP_EVENT_SUBSCRIBE(MODULE, usb_device_state_event);
 APP_EVENT_SUBSCRIBE_EARLY(MODULE, power_down_event);
 APP_EVENT_SUBSCRIBE(MODULE, wake_up_event);