/*
* 这个例程适用于`rtos`这类支持task的设备, 它演示了......
*
* 需要用户关注或修改的部分, 已经用 TODO 在注释中标明
*
*/
#include <stdio.h>
#include <string.h>
#include "aiot_state_api.h"
#include "aiot_sysdep_api.h"
#include "aiot_mqtt_api.h"
#include "aiot_dm_api.h"
#include "aiot_diag_api.h"
#include "ali_demo.h"
#include "ql_api_osi.h"
#include "ql_api_nw.h"
#include "ali_demo.h"
#include "ql_log.h"
#include "ql_api_datacall.h"
#include "sockets.h"
#include "lwip/ip_addr.h"
#include "lwip/ip6_addr.h"
#include "lwip/netdb.h"
#include "lwip/netif.h"
#include "lwip/inet.h"
#include "lwip/tcp.h"
#define QL_SOCKET_LOG_LEVEL QL_LOG_LEVEL_INFO
#define uart_printf(msg, ...) QL_LOG(QL_SOCKET_LOG_LEVEL, "linkSDK ", msg, ##__VA_ARGS__)
#define diag_mqtt_profile_idx 1
/* 位于portfiles/aiot_port文件夹下的系统适配函数集合 */
extern aiot_sysdep_portfile_t g_aiot_sysdep_portfile;
/* 位于external/ali_ca_cert.c中的服务器证书 */
extern const char *ali_ca_cert;
ql_task_t ql_alisdk_diag_task_ref;
ql_task_t g_diag_mqtt_process_task_ref;
ql_task_t g_diag_mqtt_recv_task_ref;
static uint8_t g_diag_mqtt_process_task_ref_running = 0;
static uint8_t g_diag_mqtt_recv_task_ref_running = 0;
static int datacall_satrt(void)
{
int ret = 0;
int i = 0;
ql_data_call_info_s info;
char ip4_addr_str[16] = {0};
uint8_t nSim = 0;
ql_rtos_task_sleep_s(10);
uart_printf("========== socket demo start ==========");
uart_printf("wait for network register done");
while ((ret = ql_network_register_wait(nSim, 120)) != 0 && i < 10)
{
i++;
ql_rtos_task_sleep_s(1);
}
if (ret == 0)
{
i = 0;
uart_printf("====network registered!!!!====");
}
else
{
uart_printf("====network register failure!!!!!====");
goto exit;
}
ql_set_data_call_asyn_mode(nSim, diag_mqtt_profile_idx, 0);
uart_printf("===start data call====");
ret = ql_start_data_call(nSim, diag_mqtt_profile_idx, QL_PDP_TYPE_IP, "uninet", NULL, NULL, 0);
uart_printf("===data call result:%d", ret);
if (ret != 0)
{
uart_printf("====data call failure!!!!=====");
}
memset(&info, 0x00, sizeof(ql_data_call_info_s));
ret = ql_get_data_call_info(nSim, diag_mqtt_profile_idx, &info);
if (ret != 0)
{
uart_printf("ql_get_data_call_info ret: %d", ret);
ql_stop_data_call(nSim, diag_mqtt_profile_idx);
goto exit;
}
uart_printf("info->mqtt_profile_idx: %d", info.profile_idx);
uart_printf("info->ip_version: %d", info.ip_version);
uart_printf("info->v4.state: %d", info.v4.state);
inet_ntop(AF_INET, &info.v4.addr.ip, ip4_addr_str, sizeof(ip4_addr_str));
uart_printf("info.v4.addr.ip: %s\r\n", ip4_addr_str);
inet_ntop(AF_INET, &info.v4.addr.pri_dns, ip4_addr_str, sizeof(ip4_addr_str));
uart_printf("info.v4.addr.pri_dns: %s\r\n", ip4_addr_str);
inet_ntop(AF_INET, &info.v4.addr.sec_dns, ip4_addr_str, sizeof(ip4_addr_str));
uart_printf("info.v4.addr.sec_dns: %s\r\n", ip4_addr_str);
return 0;
exit:
return -1;
}
/* TODO: 如果要关闭日志, 就把这个函数实现为空, 如果要减少日志, 可根据code选择不打印
*
* 例如: [1577589489.033][LK-0317] diag_basic_demo&a13FN5TplKq
*
* 上面这条日志的code就是0317(十六进制), code值的定义见core/aiot_state_api.h
*
*/
/* 日志回调函数, SDK的日志会从这里输出 */
static int32_t demo_state_logcb(int32_t code, char *message)
{
uart_printf("%s", message);
return 0;
}
/* MQTT事件回调函数, 当网络连接/重连/断开时被触发, 事件定义见core/aiot_mqtt_api.h */
static void demo_mqtt_event_handler(void *handle, const aiot_mqtt_event_t *event, void *userdata)
{
switch (event->type) {
/* SDK因为用户调用了aiot_mqtt_connect()接口, 与mqtt服务器建立连接已成功 */
case AIOT_MQTTEVT_CONNECT: {
uart_printf("AIOT_MQTTEVT_CONNECT\n");
}
break;
/* SDK因为网络状况被动断连后, 自动发起重连已成功 */
case AIOT_MQTTEVT_RECONNECT: {
uart_printf("AIOT_MQTTEVT_RECONNECT\n");
}
break;
/* SDK因为网络的状况而被动断开了连接, network是底层读写失败, heartbeat是没有按预期得到服务端心跳应答 */
case AIOT_MQTTEVT_DISCONNECT: {
char *cause = (event->data.disconnect == AIOT_MQTTDISCONNEVT_NETWORK_DISCONNECT) ? ("network disconnect") :
("heartbeat disconnect");
uart_printf("AIOT_MQTTEVT_DISCONNECT: %s\n", cause);
}
break;
default: {
}
}
}
/* MQTT默认消息处理回调, 当SDK从服务器收到MQTT消息时, 且无对应用户回调处理时被调用 */
static void demo_mqtt_default_recv_handler(void *handle, const aiot_mqtt_recv_t *packet, void *userdata)
{
switch (packet->type) {
case AIOT_MQTTRECV_HEARTBEAT_RESPONSE: {
uart_printf("heartbeat response\n");
}
break;
case AIOT_MQTTRECV_SUB_ACK: {
uart_printf("suback, res: -0x%04X, packet id: %d, max qos: %d\n",
-packet->data.sub_ack.res, packet->data.sub_ack.packet_id, packet->data.sub_ack.max_qos);
}
break;
case AIOT_MQTTRECV_PUB: {
uart_printf("pub, qos: %d, topic: %.*s\n", packet->data.pub.qos, packet->data.pub.topic_len, packet->data.pub.topic);
uart_printf("pub, payload: %.*s\n", packet->data.pub.payload_len, packet->data.pub.payload);
}
break;
case AIOT_MQTTRECV_PUB_ACK: {
uart_printf("puback, packet id: %d\n", packet->data.pub_ack.packet_id);
}
break;
default: {
}
}
}
/* 执行aiot_mqtt_process的线程, 包含心跳发送和QoS1消息重发 */
static void demo_mqtt_process_thread(void *args)
{
int32_t res = STATE_SUCCESS;
while (g_diag_mqtt_process_task_ref_running) {
res = aiot_mqtt_process(args);
if (res == STATE_USER_INPUT_EXEC_DISABLED) {
break;
}
ql_rtos_task_sleep_s(1);
}
return;
}
/* 执行aiot_mqtt_recv的线程, 包含网络自动重连和从服务器收取MQTT消息 */
static void demo_mqtt_recv_thread(void *args)
{
int32_t res = STATE_SUCCESS;
while (g_diag_mqtt_recv_task_ref_running) {
res = aiot_mqtt_recv(args);
if (res < STATE_SUCCESS) {
if (res == STATE_USER_INPUT_EXEC_DISABLED) {
break;
}
ql_rtos_task_sleep_s(1);
}
}
return;
}
static int32_t demo_mqtt_start(void *handle, char *product_key, char *device_name, char *device_secret)
{
int32_t res = STATE_SUCCESS;
void *mqtt_handle = handle;
char *url = "iot-as-mqtt.cn-shanghai.aliyuncs.com"; /* 阿里云平台上海站点的域名后缀 */
char host[100] = {0}; /* 用这个数组拼接设备连接的云平台站点全地址, 规则是 ${productKey}.iot-as-mqtt.cn-shanghai.aliyuncs.com */
uint16_t port = 443; /* 无论设备是否使用TLS连接阿里云平台, 目的端口都是443 */
aiot_sysdep_network_cred_t cred; /* 安全凭据结构体, 如果要用TLS, 这个结构体中配置CA证书等参数 */
/* 创建SDK的安全凭据, 用于建立TLS连接 */
memset(&cred, 0, sizeof(aiot_sysdep_network_cred_t));
cred.option = AIOT_SYSDEP_NETWORK_CRED_SVRCERT_CA; /* 使用RSA证书校验MQTT服务端 */
cred.max_tls_fragment = 16384; /* 最大的分片长度为16K, 其它可选值还有4K, 2K, 1K, 0.5K */
cred.sni_enabled = 1; /* TLS建连时, 支持Server Name Indicator */
cred.x509_server_cert = ali_ca_cert; /* 用来验证MQTT服务端的RSA根证书 */
cred.x509_server_cert_len = strlen(ali_ca_cert); /* 用来验证MQTT服务端的RSA根证书长度 */
/* TODO: 如果以下代码不被注释, 则例程会用TCP而不是TLS连接云平台 */
/*
{
memset(&cred, 0, sizeof(aiot_sysdep_network_cred_t));
cred.option = AIOT_SYSDEP_NETWORK_CRED_NONE;
}
*/
snprintf(host, 100, "%s.%s", product_key, url);
/* 配置MQTT服务器地址 */
aiot_mqtt_setopt(mqtt_handle, AIOT_MQTTOPT_HOST, (void *)host);
/* 配置MQTT服务器端口 */
aiot_mqtt_setopt(mqtt_handle, AIOT_MQTTOPT_PORT, (void *)&port);
int pdp = diag_mqtt_profile_idx;
aiot_mqtt_setopt(mqtt_handle, AIOT_MQTTOPT_PROFILE_IDX, (void *)&pdp);
/* 配置设备productKey */
aiot_mqtt_setopt(mqtt_handle, AIOT_MQTTOPT_PRODUCT_KEY, (void *)product_key);
/* 配置设备deviceName */
aiot_mqtt_setopt(mqtt_handle, AIOT_MQTTOPT_DEVICE_NAME, (void *)device_name);
/* 配置设备deviceSecret */
aiot_mqtt_setopt(mqtt_handle, AIOT_MQTTOPT_DEVICE_SECRET, (void *)device_secret);
/* 配置网络连接的安全凭据, 上面已经创建好了 */
aiot_mqtt_setopt(mqtt_handle, AIOT_MQTTOPT_NETWORK_CRED, (void *)&cred);
/* 配置MQTT默认消息接收回调函数 */
aiot_mqtt_setopt(mqtt_handle, AIOT_MQTTOPT_RECV_HANDLER, (void *)demo_mqtt_default_recv_handler);
/* 配置MQTT事件回调函数 */
aiot_mqtt_setopt(mqtt_handle, AIOT_MQTTOPT_EVENT_HANDLER, (void *)demo_mqtt_event_handler);
/* 配置MQTT连接超时时间 */
int time_delay_ms = 5000;
aiot_mqtt_setopt(mqtt_handle, AIOT_MQTTOPT_CONNECT_TIMEOUT_MS, (void *)&time_delay_ms);
/* 与服务器建立MQTT连接 */
res = aiot_mqtt_connect(mqtt_handle);
if (res < STATE_SUCCESS) {
/* 尝试建立连接失败, 销毁MQTT实例, 回收资源 */
aiot_mqtt_deinit(&mqtt_handle);
uart_printf("aiot_mqtt_connect failed: -0x%04X\n", -res);
return -1;
}
/* 创建一个单独的线程, 专用于执行aiot_mqtt_process, 它会自动发送心跳保活, 以及重发QoS1的未应答报文 */
g_diag_mqtt_process_task_ref_running = 1;
res = ql_rtos_task_create(&g_diag_mqtt_process_task_ref, 24000, 24, "client_proc", demo_mqtt_process_thread, (void*)mqtt_handle, 5);
if (res < 0) {
uart_printf("pthread_create demo_mqtt_process_thread failed: %d\n", res);
aiot_mqtt_deinit(&mqtt_handle);
return -1;
}
/* 创建一个单独的线程用于执行aiot_mqtt_recv, 它会循环收取服务器下发的MQTT消息, 并在断线时自动重连 */
g_diag_mqtt_recv_task_ref_running = 1;
res = ql_rtos_task_create(&g_diag_mqtt_recv_task_ref, 24000, 25, "recv_test", demo_mqtt_recv_thread, (void*)mqtt_handle, 5);
if (res < 0) {
uart_printf("pthread_create demo_mqtt_recv_thread failed: %d\n", res);
g_diag_mqtt_process_task_ref_running = 0;
aiot_mqtt_deinit(&mqtt_handle);
return -1;
}
return 0;
}
static int32_t demo_mqtt_stop(void **handle)
{
int32_t res = STATE_SUCCESS;
void *mqtt_handle = NULL;
mqtt_handle = *handle;
g_diag_mqtt_process_task_ref_running = 0;
g_diag_mqtt_recv_task_ref_running = 0;
// pthread_join(g_diag_mqtt_process_task_ref, NULL);
// pthread_join(g_diag_mqtt_recv_task_ref, NULL);
ql_rtos_task_delete(g_diag_mqtt_process_task_ref);
ql_rtos_task_delete(g_diag_mqtt_recv_task_ref);
/* 断开MQTT连接 */
res = aiot_mqtt_disconnect(mqtt_handle);
if (res < STATE_SUCCESS) {
aiot_mqtt_deinit(&mqtt_handle);
uart_printf("aiot_mqtt_disconnect failed: -0x%04X\n", -res);
return -1;
}
/* 销毁MQTT实例 */
res = aiot_mqtt_deinit(&mqtt_handle);
if (res < STATE_SUCCESS) {
uart_printf("aiot_mqtt_deinit failed: -0x%04X\n", -res);
return -1;
}
return 0;
}
/* 用户数据接收处理回调函数 */
static void demo_dm_recv_handler(void *dm_handle, const aiot_dm_recv_t *recv, void *userdata)
{
uart_printf("demo_dm_recv_handler, type = %d\r\n", recv->type);
switch (recv->type) {
/* 属性上报, 事件上报, 获取期望属性值或者删除期望属性值的应答 */
case AIOT_DMRECV_GENERIC_REPLY: {
uart_printf("msg_id = %d, code = %d, data = %.*s, message = %.*s\r\n",
recv->data.generic_reply.msg_id,
recv->data.generic_reply.code,
recv->data.generic_reply.data_len,
recv->data.generic_reply.data,
recv->data.generic_reply.message_len,
recv->data.generic_reply.message);
}
break;
/* 属性设置 */
case AIOT_DMRECV_PROPERTY_SET: {
uart_printf("msg_id = %ld, params = %.*s\r\n",
(unsigned long)recv->data.property_set.msg_id,
recv->data.property_set.params_len,
recv->data.property_set.params);
/* TODO: 以下代码演示如何对来自云平台的属性设置指令进行应答, 用户可取消注释查看演示效果 */
/*
{
aiot_dm_msg_t msg;
memset(&msg, 0, sizeof(aiot_dm_msg_t));
msg.type = AIOT_DMMSG_PROPERTY_SET_REPLY;
msg.data.property_set_reply.msg_id = recv->data.property_set.msg_id;
msg.data.property_set_reply.code = 200;
msg.data.property_set_reply.data = "{}";
int32_t res = aiot_dm_send(dm_handle, &msg);
if (res < 0) {
uart_printf("aiot_dm_send failed\r\n");
}
}
*/
}
break;
/* 异步服务调用 */
case AIOT_DMRECV_ASYNC_SERVICE_INVOKE: {
uart_printf("msg_id = %ld, service_id = %s, params = %.*s\r\n",
(unsigned long)recv->data.async_service_invoke.msg_id,
recv->data.async_service_invoke.service_id,
recv->data.async_service_invoke.params_len,
recv->data.async_service_invoke.params);
/* TODO: 以下代码演示如何对来自云平台的异步服务调用进行应答, 用户可取消注释查看演示效果
*
* 注意: 如果用户在回调函数外进行应答, 需要自行保存msg_id, 因为回调函数入参在退出回调函数后将被SDK销毁, 不可以再访问到
*/
/*
{
aiot_dm_msg_t msg;
memset(&msg, 0, sizeof(aiot_dm_msg_t));
msg.type = AIOT_DMMSG_ASYNC_SERVICE_REPLY;
msg.data.async_service_reply.msg_id = recv->data.async_service_invoke.msg_id;
msg.data.async_service_reply.code = 200;
msg.data.async_service_reply.service_id = "ToggleLightSwitch";
msg.data.async_service_reply.data = "{\"dataA\": 20}";
int32_t res = aiot_dm_send(dm_handle, &msg);
if (res < 0) {
uart_printf("aiot_dm_send failed\r\n");
}
}
*/
}
break;
/* 同步服务调用 */
case AIOT_DMRECV_SYNC_SERVICE_INVOKE: {
uart_printf("msg_id = %ld, rrpc_id = %s, service_id = %s, params = %.*s\r\n",
(unsigned long)recv->data.sync_service_invoke.msg_id,
recv->data.sync_service_invoke.rrpc_id,
recv->data.sync_service_invoke.service_id,
recv->data.sync_service_invoke.params_len,
recv->data.sync_service_invoke.params);
/* TODO: 以下代码演示如何对来自云平台的同步服务调用进行应答, 用户可取消注释查看演示效果
*
* 注意: 如果用户在回调函数外进行应答, 需要自行保存msg_id和rrpc_id字符串, 因为回调函数入参在退出回调函数后将被SDK销毁, 不可以再访问到
*/
/*
{
aiot_dm_msg_t msg;
memset(&msg, 0, sizeof(aiot_dm_msg_t));
msg.type = AIOT_DMMSG_SYNC_SERVICE_REPLY;
msg.data.sync_service_reply.rrpc_id = recv->data.sync_service_invoke.rrpc_id;
msg.data.sync_service_reply.msg_id = recv->data.sync_service_invoke.msg_id;
msg.data.sync_service_reply.code = 200;
msg.data.sync_service_reply.service_id = "SetLightSwitchTimer";
msg.data.sync_service_reply.data = "{}";
int32_t res = aiot_dm_send(dm_handle, &msg);
if (res < 0) {
uart_printf("aiot_dm_send failed\r\n");
}
}
*/
}
break;
/* 下行二进制数据 */
case AIOT_DMRECV_RAW_DATA: {
uart_printf("raw data len = %d\r\n", recv->data.raw_data.data_len);
/* TODO: 以下代码演示如何发送二进制格式数据, 若使用需要有相应的数据透传脚本部署在云端 */
/*
{
aiot_dm_msg_t msg;
uint8_t raw_data[] = {0x01, 0x02};
memset(&msg, 0, sizeof(aiot_dm_msg_t));
msg.type = AIOT_DMMSG_RAW_DATA;
msg.data.raw_data.data = raw_data;
msg.data.raw_data.data_len = sizeof(raw_data);
aiot_dm_send(dm_handle, &msg);
}
*/
}
break;
/* 二进制格式的同步服务调用, 比单纯的二进制数据消息多了个rrpc_id */
case AIOT_DMRECV_RAW_SYNC_SERVICE_INVOKE: {
uart_printf("raw sync service rrpc_id = %s, data_len = %d\r\n",
recv->data.raw_service_invoke.rrpc_id,
recv->data.raw_service_invoke.data_len);
}
break;
default:
break;
}
}
static int32_t demo_dm_start(void **handle, void *mqtt_handle, char *product_key, char *device_name)
{
void *dm_handle = NULL;
dm_handle = aiot_dm_init();
if (dm_handle == NULL) {
return -1;
}
/* 配置MQTT实例句柄 */
aiot_dm_setopt(dm_handle, AIOT_DMOPT_MQTT_HANDLE, mqtt_handle);
/* 配置消息接收处理回调函数 */
aiot_dm_setopt(dm_handle, AIOT_DMOPT_RECV_HANDLER, (void *)demo_dm_recv_handler);
*handle = dm_handle;
return STATE_SUCCESS;
}
static int32_t demo_dm_stop(void **handle)
{
int32_t res = STATE_SUCCESS;
/* 销毁DATA-MODEL实例, 一般不会运行到这里 */
res = aiot_dm_deinit(handle);
if (res < STATE_SUCCESS) {
uart_printf("aiot_dm_deinit failed: -0x%04X\n", -res);
return -1;
}
return STATE_SUCCESS;
}
/* 事件回调函数, 当网络连接/重连/断开时被触发, 事件定义见core/aiot_diag_api.h */
static void demo_diag_event_handler(void *handle, const aiot_diag_event_t *event, void *userdata)
{
switch (event->type) {
case AIOT_DIAGEVT_ALERT: {
uart_printf("AIOT_DIAGEVT_ALERT, module name: %s, level: %s, desc: %s\n",
event->data.alert.module_name, event->data.alert.level, event->data.alert.desc);
}
break;
default: {
}
}
}
/* 数据处理回调, 当SDK从网络上收到diag消息时被调用 */
// static void demo_diag_recv_handler(void *handle, const aiot_diag_recv_t *packet, void *userdata)
// {
// switch (packet->type) {
// case AIOT_DIAGRECV_DIAG_CONTROL: {
// }
// break;
// default: {
//
// }
// }
// }
static void ali_diag_test(void *arg)
{
int32_t res = STATE_SUCCESS;
void *mqtt_handle = NULL, *diag_handle = NULL, *dm_handle = NULL;
/* TODO: 替换为自己设备的三元组 */
char *product_key = "a1TSu2F29co";
char *device_name = "000001";
char *device_secret = "bd220c3a9c6a5b3f5921485d091497e1";
/*执行拨号操作，设备联网*/
if(datacall_satrt()!=0)
goto exit;
//return;
/* 配置SDK的底层依赖 */
aiot_sysdep_set_portfile(&g_aiot_sysdep_portfile);
/* 配置SDK的日志输出 */
aiot_state_set_logcb(demo_state_logcb);
/* 创建1个MQTT客户端实例并内部初始化默认参数 */
mqtt_handle = aiot_mqtt_init();
if (mqtt_handle == NULL) {
uart_printf("aiot_mqtt_init failed\n");
goto exit;
//return;
}
diag_handle = aiot_diag_init();
if (diag_handle == NULL) {
uart_printf("aiot_diag_init failed\n");
goto exit;
//return;
}
aiot_diag_setopt(diag_handle, AIOT_DIAGOPT_MQTT_HANDLE, mqtt_handle);
aiot_diag_setopt(diag_handle, AIOT_DIAGOPT_EVENT_HANDLER, demo_diag_event_handler);
aiot_diag_start(diag_handle);
/* 建立MQTT连接, 并开启保活线程和接收线程 */
res = demo_mqtt_start(mqtt_handle, product_key, device_name, device_secret);
if (res < 0) {
uart_printf("demo_mqtt_start failed\n");
goto exit;
//return;
}
res = demo_dm_start(&dm_handle, mqtt_handle, product_key, device_name);
if (res < 0) {
uart_printf("demo_dm_start failed\n");
goto exit;
//return;
}
/* {
aiot_dm_msg_t msg;
memset(&msg, 0, sizeof(aiot_dm_msg_t));
msg.type = AIOT_DMMSG_PROPERTY_POST;
msg.data.property_post.params = "{\"LightSwitch\":1}";
res = aiot_dm_send(dm_handle, &msg);
} */
while(1) {
ql_rtos_task_sleep_s(1);
}
exit:
/* 销毁dm实例, 一般不会运行到这里 */
demo_dm_stop(&dm_handle);
/* 销毁diag实例, 一般不会运行到这里 */
aiot_diag_deinit(&diag_handle);
/* 销毁MQTT实例, 退出线程, 一般不会运行到这里 */
demo_mqtt_stop(&mqtt_handle);
return;
}
#define QL_ALI_TASK_STACK_SIZE 10240
#define QL_ALI_TASK_PRIO APP_PRIORITY_NORMAL
#define QL_ALI_TASK_EVENT_CNT 5
int ql_ali_sdk_diag_test_init(void)
{
QlOSStatus status;
int count = 0;
/* 主体进入休眠 */
while (count < 10)
{
count++;
ql_rtos_task_sleep_s(1);
uart_printf("ql_ali_sdk_mqtt_client_test_init -0x%04X\n", count);
}
status =ql_rtos_task_create(&ql_alisdk_diag_task_ref, QL_ALI_TASK_STACK_SIZE, APP_PRIORITY_NORMAL, "diag_test", ali_diag_test, NULL, QL_ALI_TASK_EVENT_CNT);
if (status != QL_OSI_SUCCESS)
{
uart_printf("ql_ali_sdk_diag_test_init error");
return -1;
}
return 0;
}