Question

我目前正在做一个使用三星Galaxy Gear S3作为蓝牙低功耗服务器来构建客户服务的项目。问题是在我构建了特性和描述符，将它们添加到另一个服务器并将服务注册到服务器并启动服务器之后，我的iPhone上的BlueScanner应用程序只显示我的特性和描述符没有价值，但有uuid。这是我的代码：

const char *service_uuid = "ADE3D529-C784-4F63-A987-EB69F70EE816";
bt_gatt_service_type_e type = BT_GATT_SERVICE_TYPE_PRIMARY;
//server handle
static bt_gatt_server_h gattServer = NULL;

//service handle
static bt_gatt_h gattSvc = NULL;

//Characteristic handle
bt_gatt_h gattChara = NULL;
const char *charaUuid = "AD7B334F-4637-4B86-90B6-9D787F03D218";
//const char *charaValue = "myCharacteristic";

//descriptor handle
static bt_gatt_h gattDescriptor = NULL;
const char *DescUuid = "0x1002";
const char *DescValue = "50";

void createService() {
dlog_print(DLOG_INFO, LOG_TAG, "Create Service");
int ret = bt_gatt_server_initialize();
if (ret != BT_ERROR_NONE) {
    char* err;
    err = get_error_message(ret);
    dlog_print(DLOG_ERROR, LOG_TAG, "Init GATT server failed. err = %s",
            err);
}

if (!gattServer) {
//      gattServer not exist, create server
    ret = bt_gatt_server_create(&gattServer);
    if (ret != BT_ERROR_NONE) {
        char* err;
        err = get_error_message(ret);
        dlog_print(DLOG_ERROR, LOG_TAG,
                "Create GATT server failed. err = %s", err);
    } else {
        dlog_print(DLOG_INFO, LOG_TAG, "Create GATT server Succeed");
    }
}

ret = bt_gatt_service_create(service_uuid, type, &gattSvc);
if (ret != BT_ERROR_NONE) {
    char* err;
    err = get_error_message(ret);
    dlog_print(DLOG_ERROR, LOG_TAG, "Create GATT service failed. err = %s",
            err);
} else {
    dlog_print(DLOG_INFO, LOG_TAG, "Create GATT service Succeed");
}

ret = bt_gatt_characteristic_create(charaUuid,
        BT_GATT_PERMISSION_READ | BT_GATT_PERMISSION_WRITE,
        BT_GATT_PROPERTY_INDICATE | BT_GATT_PROPERTY_READ, charaValue,
        LE_INITIAL_BUF_SIZE, &gattChara);
if (ret != BT_ERROR_NONE) {
    char* err;
    err = get_error_message(ret);
    dlog_print(DLOG_ERROR, LOG_TAG,
            "create characteristic  failed. err = %s", err);
} else {
    dlog_print(DLOG_INFO, LOG_TAG, "create characteristic Succeed");
}

ret = bt_gatt_server_set_read_value_requested_cb(gattChara,
        __bt_gatt_server_read_value_requested_cb, NULL);
if (ret != BT_ERROR_NONE) {
    char* err;
    err = get_error_message(ret);
    dlog_print(DLOG_ERROR, LOG_TAG, "create read request failed. err = %s",
            err);
} else {
    dlog_print(DLOG_INFO, LOG_TAG, "create read request Succeed");
}

ret = bt_gatt_descriptor_create(DescUuid,
        BT_GATT_PERMISSION_READ | BT_GATT_PERMISSION_WRITE, DescValue,
        LE_INITIAL_BUF_SIZE, &gattDescriptor);
if (ret != BT_ERROR_NONE) {
    char* err;
    err = get_error_message(ret);
    dlog_print(DLOG_ERROR, LOG_TAG, "create descriptor failed. err = %s",
            err);
} else {
    dlog_print(DLOG_INFO, LOG_TAG, "create descriptor server Succeed");
}

ret = bt_gatt_characteristic_add_descriptor(gattChara, gattDescriptor);
if (ret != BT_ERROR_NONE) {
    char* err;
    err = get_error_message(ret);
    dlog_print(DLOG_ERROR, LOG_TAG,
            "add descriptor to characteristic failed. err = %s", err);
} else {
    dlog_print(DLOG_INFO, LOG_TAG,
            "add descriptor to characteristic Succeed");
}
ret = bt_gatt_service_add_characteristic(gattSvc, gattChara);
if (ret != BT_ERROR_NONE) {
    char* err;
    err = get_error_message(ret);
    dlog_print(DLOG_ERROR, LOG_TAG,
            "add characteristic to service failed. err = %s", err);
} else {
    dlog_print(DLOG_INFO, LOG_TAG, "add characteristic to service Succeed");
}

ret = bt_gatt_server_register_service(gattServer, gattSvc);
if (ret != BT_ERROR_NONE) {
    char* err;
    err = get_error_message(ret);
    dlog_print(DLOG_ERROR, LOG_TAG,
            "register GATT service failed. err = %s", err);
} else {
    dlog_print(DLOG_INFO, LOG_TAG, "register GATT service Succeed");
}

ret = bt_gatt_server_start();
if (ret != BT_ERROR_NONE) {
    char* err;
    err = get_error_message(ret);
    dlog_print(DLOG_ERROR, LOG_TAG, "start GATT server failed. err = %s",
            err);
} else {
    dlog_print(DLOG_INFO, LOG_TAG, "start GATT server Succeed");
}
}

提前致谢！

Answer 1

我最终解决了这个问题。事实证明必须在“__bt_gatt_server_read_value_requested_cb”中调用“bt_gatt_server_send_response”函数。我猜客户端每次都读取该值，因为函数没有定义，所以它不返回任何内容，因此服务器的值设置为NULL。

Tizen 3.0.0.2上的蓝牙LE Gatt服务器特征值始终为NULL

1 个答案: