【Alios-things笔记】嵌入式Linux平台使能WIFI配网和本地通讯
概述
在Alios-things中虽然有linuxhost程序可以运行，但是这个编译出来的程序出来的应用程序只能运行在x86平台，如果想让嵌入式Linux系统的设备接入阿里的物联网平台或者智能生活开放平台，只能使用阿里提供的iotx-sdk-c SDK。
Link Kit SDK用户手册
问题
在MT7688上运行OpenWrt开源路由系统，并使用iotx-sdk-cSDK将其接入阿里智能生活开放平台上，当使用生活开放平台提供的公版APP，在同一个局域网下，无法发现和绑定设备。
解决方法及步骤
无法发现和绑定SDK是由于SDK中没有WIFI配网和本地通讯的模块，在sdk的V2.2版本之前需要提供交叉编译工具向阿里索取libawss.a静态库文件，并将其添加到工程中即可，V2.2.1之后，iotx-sdk-c将WIFI配网模块和本地通讯模块进行了开源。同时还需要修改或添加下面的内容
- 修改iotx_cm_common.c文件
在该文件中有一个awss_report_cloud（）函数，将其做如下修改
- 增加WIFI相关的接口
awss库需要底层接口支持，这些接口的实现与硬件平台密切相关，所以需要在iotx-sdk-c/src/ref-impl/hal/os/OpenWrt下实现相应的接口，接口定义位于SDK的iot_import_awss.h头文件中。
/**
* @brief 在设备的持久化外部存储器比如Flash上, 从配置区域起始位置读取数据到指定的内存缓冲区中
*
* @param buffer : 存放读取配置信息的缓冲区起始地址
* @param length : 将要读取的数据长度, 单位是字节(Byte)
* @retval -1 : 读取失败
* @retval 0 : 读取成功
*/
int HAL_Config_Read(_IN_ char *buffer, _IN_ int length);
/**
* @brief 在设备的持久化外部存储器比如Flash上, 把指定的内存缓冲区向配置区域起始位置写入
*
* @param buffer : 存放要写到外存的数据的缓冲区
* @param length : 将要写入的数据长度, 单位是字节(Byte)
* @retval -1 : 写入失败
* @retval 0 : 写入成功
*/
int HAL_Config_Write(_IN_ const char *buffer, _IN_ int length);
/**
* @brief 获取Wi-Fi的接受信号强度(`RSSI`)
*
* @return 信号强度数值, 单位是dBm
*/
int HAL_Wifi_Get_Rssi_Dbm(void);
/**
* @brief 使WiFi模组进入省电模式, 并持续一段时间
*
* @param 指定在多长时间内, WiFi模组都处于省电模式, 单位是毫秒
* @retval 0 : 设置成功
* @retval -1 : 设置失败
*
* @note sample code
* int HAL_Wifi_Low_Power(int timeout_ms)
* {
* wifi_enter_power_saving_mode();
* msleep(timeout_ms);
* wifi_exit_power_saving_mode();
*
* return 0;
* }
*/
int HAL_Wifi_Low_Power(_IN_ int timeout_ms);
/**
* @brief 获取RF433的接收信号强度(`RSSI`)
*
* @return 信号强度数值, 单位是dBm
*/
int HAL_RF433_Get_Rssi_Dbm(void);
/**
* @brief 获取Wi-Fi网口的MAC地址, 格式应当是"XX:XX:XX:XX:XX:XX"
*
* @param mac_str : 用于存放MAC地址字符串的缓冲区数组
* @return 指向缓冲区数组起始位置的字符指针
*/
char *HAL_Wifi_Get_Mac(_OU_ char mac_str[HAL_MAC_LEN]);
#define HAL_IP_LEN (15 + 1)
/**
* @brief 获取Wi-Fi网口的IP地址, 点分十进制格式保存在字符串数组出参, 二进制格式则作为返回值, 并以网络字节序(大端)表达
*
* @param ifname : 指定Wi-Fi网络接口的名字
* @param ip_str : 存放点分十进制格式的IP地址字符串的数组
* @return 二进制形式的IP地址, 以网络字节序(大端)组织
*/
uint32_t HAL_Wifi_Get_IP(_OU_ char ip_str[HAL_IP_LEN], _IN_ const char *ifname);
/**
* @brief 获取Wi-Fi模块上的操作系统版本字符串
*
* @param version_str : 存放版本字符串的缓冲区数组
* @return 指向缓冲区数组的起始地址
*/
char *HAL_Wifi_Get_Os_Version(_OU_ char version_str[STR_SHORT_LEN]);
/**
* @brief 获取配网服务(`AWSS`)的超时时间长度, 单位是毫秒
*
* @return 超时时长, 单位是毫秒
* @note 推荐时长是60,0000毫秒
*/
int HAL_Awss_Get_Timeout_Interval_Ms(void);
/**
* @brief 获取配网服务(`AWSS`)超时时长到达之后, 去连接默认SSID时的超时时长, 单位是毫秒
*
* @return 超时时长, 单位是毫秒
* @note 推荐时长是0毫秒, 含义是永远持续
*/
int HAL_Awss_Get_Connect_Default_Ssid_Timeout_Interval_Ms(void);
/**
* @brief 获取在每个信道(`channel`)上扫描的时间长度, 单位是毫秒
*
* @return 时间长度, 单位是毫秒
* @note 推荐时长是200毫秒到400毫秒
*/
int HAL_Awss_Get_Channelscan_Interval_Ms(void);
/* link type */
enum AWSS_LINK_TYPE {
/* rtos HAL choose this type */
AWSS_LINK_TYPE_NONE,
/* linux HAL may choose the following type */
AWSS_LINK_TYPE_PRISM,
AWSS_LINK_TYPE_80211_RADIO,
AWSS_LINK_TYPE_80211_RADIO_AVS,
AWSS_LINK_TYPE_HT40_CTRL /* for espressif HAL, see struct ht40_ctrl */
};
struct HAL_Ht40_Ctrl {
uint16_t length;
uint8_t filter;
signed char rssi;
};
/**
* @brief 802.11帧的处理函数, 可以将802.11 Frame传递给这个函数
*
* @param[in] buf @n 80211 frame buffer, or pointer to struct ht40_ctrl
* @param[in] length @n 80211 frame buffer length
* @param[in] link_type @n AWSS_LINK_TYPE_NONE for most rtos HAL,
* and for linux HAL, do the following step to check
* which header type the driver supported.
@verbatim
a) iwconfig wlan0 mode monitor #open monitor mode
b) iwconfig wlan0 channel 6 #switch channel 6
c) tcpdump -i wlan0 -s0 -w file.pacp #capture 80211 frame & save
d) open file.pacp with wireshark or omnipeek
check the link header type and fcs included or not
@endverbatim
* @param[in] with_fcs @n 80211 frame buffer include fcs(4 byte) or not
* @param[in] rssi @n rssi of packet, range of [-127, -1]
*/
typedef int (*awss_recv_80211_frame_cb_t)(char *buf, int length,
enum AWSS_LINK_TYPE link_type, int with_fcs, signed char rssi);
/**
* @brief 设置Wi-Fi网卡工作在监听(Monitor)模式, 并在收到802.11帧的时候调用被传入的回调函数
*
* @param[in] cb @n A function pointer, called back when wifi receive a frame.
*/
void HAL_Awss_Open_Monitor(_IN_ awss_recv_80211_frame_cb_t cb);
/**
* @brief 设置Wi-Fi网卡离开监听(Monitor)模式, 并开始以站点(Station)模式工作
*/
void HAL_Awss_Close_Monitor(void);
/**
* @brief 设置Wi-Fi网卡切换到指定的信道(channel)上
*
* @param[in] primary_channel @n Primary channel.
* @param[in] secondary_channel @n Auxiliary channel if 40Mhz channel is supported, currently
* this param is always 0.
* @param[in] bssid @n A pointer to wifi BSSID on which awss lock the channel, most HAL
* may ignore it.
*/
void HAL_Awss_Switch_Channel(
_IN_ char primary_channel,
_IN_OPT_ char secondary_channel,
_IN_OPT_ uint8_t bssid[ETH_ALEN]);
/**
* @brief 要求Wi-Fi网卡连接指定热点(Access Point)的函数
*
* @param[in] connection_timeout_ms @n AP connection timeout in ms or HAL_WAIT_INFINITE
* @param[in] ssid @n AP ssid
* @param[in] passwd @n AP passwd
* @param[in] auth @n optional(AWSS_AUTH_TYPE_INVALID), AP auth info
* @param[in] encry @n optional(AWSS_ENC_TYPE_INVALID), AP encry info
* @param[in] bssid @n optional(NULL or zero mac address), AP bssid info
* @param[in] channel @n optional, AP channel info
* @return
@verbatim
= 0: connect AP & DHCP success
= -1: connect AP or DHCP fail/timeout
@endverbatim
* @see None.
* @note
* If the STA connects the old AP, HAL should disconnect from the old AP firstly.
* If bssid specifies the dest AP, HAL should use bssid to connect dest AP.
*/
int HAL_Awss_Connect_Ap(
_IN_ uint32_t connection_timeout_ms,
_IN_ char ssid[HAL_MAX_SSID_LEN],
_IN_ char passwd[HAL_MAX_PASSWD_LEN],
_IN_OPT_ enum AWSS_AUTH_TYPE auth,
_IN_OPT_ enum AWSS_ENC_TYPE encry,
_IN_OPT_ uint8_t bssid[ETH_ALEN],
_IN_OPT_ uint8_t channel);
/**
* @brief check system network is ready(get ip address) or not.
*
* @param None.
* @return 0, net is not ready; 1, net is ready.
* @see None.
* @note None.
*/
int HAL_Sys_Net_Is_Ready();
/**
* @brief 在当前信道(channel)上以基本数据速率(1Mbps)发送裸的802.11帧(raw 802.11 frame)
*
* @param[in] type @n see enum HAL_Awss_frame_type, currently only FRAME_BEACON
* FRAME_PROBE_REQ is used
* @param[in] buffer @n 80211 raw frame, include complete mac header & FCS field
* @param[in] len @n 80211 raw frame length
* @return
@verbatim
= 0, send success.
= -1, send failure.
= -2, unsupported.
@endverbatim
* @see None.
* @note awss use this API send raw frame in wifi monitor mode & station mode
*/
int HAL_Wifi_Send_80211_Raw_Frame(_IN_ enum HAL_Awss_Frame_Type type,
_IN_ uint8_t *buffer, _IN_ int len);
/**
* @brief 管理帧的处理回调函数
*
* @param[in] buffer @n 80211 raw frame or ie(information element) buffer
* @param[in] len @n buffer length
* @param[in] rssi_dbm @n rssi in dbm, range of [-127, -1], set it to -1 if not supported
* @param[in] buffer_type @n 0 when buffer is a 80211 frame,
* 1 when buffer only contain IE info
* @return None.
* @see None.
* @note None.
*/
typedef void (*awss_wifi_mgmt_frame_cb_t)(_IN_ uint8_t *buffer, _IN_ int len,
_IN_ signed char rssi_dbm, _IN_ int buffer_type);
/**
* @brief 在站点(Station)模式下使能或禁用对管理帧的过滤
*
* @param[in] filter_mask @n see mask macro in enum HAL_Awss_frame_type,
* currently only FRAME_PROBE_REQ_MASK & FRAME_BEACON_MASK is used
* @param[in] vendor_oui @n oui can be used for precise frame match, optional
* @param[in] callback @n see awss_wifi_mgmt_frame_cb_t, passing 80211
* frame or ie to callback. when callback is NULL
* disable sniffer feature, otherwise enable it.
* @return
@verbatim
= 0, success
= -1, fail
= -2, unsupported.
@endverbatim
* @see None.
* @note awss use this API to filter specific mgnt frame in wifi station mode
*/
int HAL_Wifi_Enable_Mgmt_Frame_Filter(
_IN_ uint32_t filter_mask,
_IN_OPT_ uint8_t vendor_oui[3],
_IN_ awss_wifi_mgmt_frame_cb_t callback);
typedef struct {
enum AWSS_AUTH_TYPE auth;
enum AWSS_ENC_TYPE encry;
uint8_t channel;
signed char rssi_dbm;
char ssid[HAL_MAX_SSID_LEN];
uint8_t mac[ETH_ALEN];
} awss_ap_info_t;
/**
* @brief handle one piece of AP information from wifi scan result
*
* @param[in] ssid @n name of AP
* @param[in] bssid @n mac address of AP
* @param[in] channel @n AP channel
* @param[in] rssi @n rssi range[-127, -1].
* the higher the RSSI number, the stronger the signal.
* @param[in] is_last_ap @n this AP information is the last one if is_last_ap > 0.
* this AP information is not the last one if is_last_ap == 0.
* @return 0 for wifi scan is done, otherwise return -1
* @see None.
* @note None.
*/
typedef int (*awss_wifi_scan_result_cb_t)(
const char ssid[HAL_MAX_SSID_LEN],
const uint8_t bssid[ETH_ALEN],
enum AWSS_AUTH_TYPE auth,
enum AWSS_ENC_TYPE encry,
uint8_t channel, signed char rssi,
int is_last_ap);
/**
* @brief 启动一次Wi-Fi的空中扫描(Scan)
*
* @param[in] cb @n pass ssid info(scan result) to this callback one by one
* @return 0 for wifi scan is done, otherwise return -1
* @see None.
* @note
* This API should NOT exit before the invoking for cb is finished.
* This rule is something like the following :
* HAL_Wifi_Scan() is invoked...
* ...
* for (ap = first_ap; ap <= last_ap; ap = next_ap){
* cb(ap)
* }
* ...
* HAL_Wifi_Scan() exit...
*/
int HAL_Wifi_Scan(awss_wifi_scan_result_cb_t cb);
/**
* @brief 获取所连接的热点(Access Point)的信息
*
* @param[out] ssid: array to store ap ssid. It will be null if ssid is not required.
* @param[out] passwd: array to store ap password. It will be null if ap password is not required.
* @param[out] bssid: array to store ap bssid. It will be null if bssid is not required.
* @return
@verbatim
= 0: succeeded
= -1: failed
@endverbatim
* @see None.
* @note
* If the STA dosen't connect AP successfully, HAL should return -1 and not touch the ssid/passwd/bssid buffer.
*/
int HAL_Wifi_Get_Ap_Info(
_OU_ char ssid[HAL_MAX_SSID_LEN],
_OU_ char passwd[HAL_MAX_PASSWD_LEN],
_OU_ uint8_t bssid[ETH_ALEN]);
/**
* @brief 获取`smartconfig`服务的安全等级
*
* @param None.
* @return The security level:
@verbatim
0: open (no encrypt)
1: aes256cfb with default aes-key and aes-iv
2: aes128cfb with default aes-key and aes-iv
3: aes128cfb with aes-key per product and aes-iv = 0
4: aes128cfb with aes-key per device and aes-iv = 0
5: aes128cfb with aes-key per manufacture and aes-iv = 0
others: invalid
@endverbatim
* @see None.
*/
int HAL_Awss_Get_Encrypt_Type();
/**
* @brief Get Security level for wifi configuration with connection.
* Used for AP solution of router and App.
*
* @param None.
* @return The security level:
@verbatim
3: aes128cfb with aes-key per product and aes-iv = random
4: aes128cfb with aes-key per device and aes-iv = random
5: aes128cfb with aes-key per manufacture and aes-iv = random
others: invalid
@endverbatim
* @see None.
*/
int HAL_Awss_Get_Conn_Encrypt_Type();接口实现如下所示：
或者参考Alios-things 中rhino的实现
https://github.com/alibaba/AliOS-Things/blob/master/framework/protocol/linkkit/iotkit/hal-impl/rhino/HAL_AWSS_rhino.c
/**
* @brief 获取Wi-Fi的接受信号强度(`RSSI`)
*
* @return 信号强度数值, 单位是dBm
*/
int HAL_Wifi_Get_Rssi_Dbm(void)
{
return 0;
}
/**
* @brief 使WiFi模组进入省电模式, 并持续一段时间
*
* @param 指定在多长时间内, WiFi模组都处于省电模式, 单位是毫秒
* @retval 0 : 设置成功
* @retval -1 : 设置失败
*
* @note sample code
* int HAL_Wifi_Low_Power(int timeout_ms)
* {
* wifi_enter_power_saving_mode();
* msleep(timeout_ms);
* wifi_exit_power_saving_mode();
*
* return 0;
* }
*/
int HAL_Wifi_Low_Power(_IN_ int timeout_ms)
{
return 0;
}
/**
* @brief 获取Wi-Fi网口的MAC地址, 格式应当是"XX:XX:XX:XX:XX:XX"
*
* @param mac_str : 用于存放MAC地址字符串的缓冲区数组
* @return 指向缓冲区数组起始位置的字符指针
*/
char *HAL_Wifi_Get_Mac(_OU_ char mac_str[HAL_MAC_LEN])
{
memcpy(mac_str,"12:34:56:78:90:1A",HAL_MAC_LEN);
return mac_str;
}
/**
* @brief 获取Wi-Fi模块上的操作系统版本字符串
*
* @param version_str : 存放版本字符串的缓冲区数组
* @return 指向缓冲区数组的起始地址
*/
#define AOS_VERSION_STR "aos1.2.0"
char *HAL_Wifi_Get_Os_Version(_OU_ char version_str[STR_SHORT_LEN])
{
return strncpy(version_str, AOS_VERSION_STR, sizeof(AOS_VERSION_STR));
}
/**
* @brief 获取配网服务(`AWSS`)的超时时间长度, 单位是毫秒
*
* @return 超时时长, 单位是毫秒
* @note 推荐时长是60,0000毫秒
*/
int HAL_Awss_Get_Timeout_Interval_Ms(void)
{
return 3 * 60 * 1000;
}
/**
* @brief 获取配网服务(`AWSS`)超时时长到达之后, 去连接默认SSID时的超时时长, 单位是毫秒
*
* @return 超时时长, 单位是毫秒
* @note 推荐时长是0毫秒, 含义是永远持续
*/
int HAL_Awss_Get_Connect_Default_Ssid_Timeout_Interval_Ms(void)
{
return 0;
}
/**
* @brief 获取在每个信道(`channel`)上扫描的时间长度, 单位是毫秒
*
* @return 时间长度, 单位是毫秒
* @note 推荐时长是200毫秒到400毫秒
*/
int HAL_Awss_Get_Channelscan_Interval_Ms(void)
{
return 200;
}
/**
* @brief 设置Wi-Fi网卡工作在监听(Monitor)模式, 并在收到802.11帧的时候调用被传入的回调函数
*
* @param[in] cb @n A function pointer, called back when wifi receive a frame.
*/
void HAL_Awss_Open_Monitor(_IN_ awss_recv_80211_frame_cb_t cb)
{
}
/**
* @brief 设置Wi-Fi网卡离开监听(Monitor)模式, 并开始以站点(Station)模式工作
*/
void HAL_Awss_Close_Monitor(void)
{
}
/**
* @brief 设置Wi-Fi网卡切换到指定的信道(channel)上
*
* @param[in] primary_channel @n Primary channel.
* @param[in] secondary_channel @n Auxiliary channel if 40Mhz channel is supported, currently
* this param is always 0.
* @param[in] bssid @n A pointer to wifi BSSID on which awss lock the channel, most HAL
* may ignore it.
*/
void HAL_Awss_Switch_Channel(
_IN_ char primary_channel,
_IN_OPT_ char secondary_channel,
_IN_OPT_ uint8_t bssid[ETH_ALEN])
{
}
/**
* @brief 要求Wi-Fi网卡连接指定热点(Access Point)的函数
*
* @param[in] connection_timeout_ms @n AP connection timeout in ms or HAL_WAIT_INFINITE
* @param[in] ssid @n AP ssid
* @param[in] passwd @n AP passwd
* @param[in] auth @n optional(AWSS_AUTH_TYPE_INVALID), AP auth info
* @param[in] encry @n optional(AWSS_ENC_TYPE_INVALID), AP encry info
* @param[in] bssid @n optional(NULL or zero mac address), AP bssid info
* @param[in] channel @n optional, AP channel info
* @return
@verbatim
= 0: connect AP & DHCP success
= -1: connect AP or DHCP fail/timeout
@endverbatim
* @see None.
* @note
* If the STA connects the old AP, HAL should disconnect from the old AP firstly.
* If bssid specifies the dest AP, HAL should use bssid to connect dest AP.
*/
int HAL_Awss_Connect_Ap(
_IN_ uint32_t connection_timeout_ms,
_IN_ char ssid[HAL_MAX_SSID_LEN],
_IN_ char passwd[HAL_MAX_PASSWD_LEN],
_IN_OPT_ enum AWSS_AUTH_TYPE auth,
_IN_OPT_ enum AWSS_ENC_TYPE encry,
_IN_OPT_ uint8_t bssid[ETH_ALEN],
_IN_OPT_ uint8_t channel)
{
return -1;
}
/**
* @brief check system network is ready(get ip address) or not.
*
* @param None.
* @return 0, net is not ready; 1, net is ready.
* @see None.
* @note None.
*/
int HAL_Sys_Net_Is_Ready()
{
return 1;
}
/**
* @brief 在当前信道(channel)上以基本数据速率(1Mbps)发送裸的802.11帧(raw 802.11 frame)
*
* @param[in] type @n see enum HAL_Awss_frame_type, currently only FRAME_BEACON
* FRAME_PROBE_REQ is used
* @param[in] buffer @n 80211 raw frame, include complete mac header & FCS field
* @param[in] len @n 80211 raw frame length
* @return
@verbatim
= 0, send success.
= -1, send failure.
= -2, unsupported.
@endverbatim
* @see None.
* @note awss use this API send raw frame in wifi monitor mode & station mode
*/
int HAL_Wifi_Send_80211_Raw_Frame(_IN_ enum HAL_Awss_Frame_Type type,
_IN_ uint8_t *buffer, _IN_ int len)
{
return 0;
}
/**
* @brief 在站点(Station)模式下使能或禁用对管理帧的过滤
*
* @param[in] filter_mask @n see mask macro in enum HAL_Awss_frame_type,
* currently only FRAME_PROBE_REQ_MASK & FRAME_BEACON_MASK is used
* @param[in] vendor_oui @n oui can be used for precise frame match, optional
* @param[in] callback @n see awss_wifi_mgmt_frame_cb_t, passing 80211
* frame or ie to callback. when callback is NULL
* disable sniffer feature, otherwise enable it.
* @return
@verbatim
= 0, success
= -1, fail
= -2, unsupported.
@endverbatim
* @see None.
* @note awss use this API to filter specific mgnt frame in wifi station mode
*/
int HAL_Wifi_Enable_Mgmt_Frame_Filter(
_IN_ uint32_t filter_mask,
_IN_OPT_ uint8_t vendor_oui[3],
_IN_ awss_wifi_mgmt_frame_cb_t callback)
{
return 0;
}
/**
* @brief 启动一次Wi-Fi的空中扫描(Scan)
*
* @param[in] cb @n pass ssid info(scan result) to this callback one by one
* @return 0 for wifi scan is done, otherwise return -1
* @see None.
* @note
* This API should NOT exit before the invoking for cb is finished.
* This rule is something like the following :
* HAL_Wifi_Scan() is invoked...
* ...
* for (ap = first_ap; ap <= last_ap; ap = next_ap){
* cb(ap)
* }
* ...
* HAL_Wifi_Scan() exit...
*/
int HAL_Wifi_Scan(awss_wifi_scan_result_cb_t cb)
{
return 0;
}
/**
* @brief 获取所连接的热点(Access Point)的信息
*
* @param[out] ssid: array to store ap ssid. It will be null if ssid is not required.
* @param[out] passwd: array to store ap password. It will be null if ap password is not required.
* @param[out] bssid: array to store ap bssid. It will be null if bssid is not required.
* @return
@verbatim
= 0: succeeded
= -1: failed
@endverbatim
* @see None.
* @note
* If the STA dosen't connect AP successfully, HAL should return -1 and not touch the ssid/passwd/bssid buffer.
*/
int HAL_Wifi_Get_Ap_Info(
_OU_ char ssid[HAL_MAX_SSID_LEN],
_OU_ char passwd[HAL_MAX_PASSWD_LEN],
_OU_ uint8_t bssid[ETH_ALEN])
{
return 0;
}
/**
* @brief 获取`smartconfig`服务的安全等级
*
* @param None.
* @return The security level:
@verbatim
0: open (no encrypt)
1: aes256cfb with default aes-key and aes-iv
2: aes128cfb with default aes-key and aes-iv
3: aes128cfb with aes-key per product and aes-iv = 0
4: aes128cfb with aes-key per device and aes-iv = 0
5: aes128cfb with aes-key per manufacture and aes-iv = 0
others: invalid
@endverbatim
* @see None.
*/
int HAL_Awss_Get_Encrypt_Type()
{
return 3;
}
/**
* @brief Get Security level for wifi configuration with connection.
* Used for AP solution of router and App.
*
* @param None.
* @return The security level:
@verbatim
3: aes128cfb with aes-key per product and aes-iv = random
4: aes128cfb with aes-key per device and aes-iv = random
5: aes128cfb with aes-key per manufacture and aes-iv = random
others: invalid
@endverbatim
* @see None.
*/
int HAL_Awss_Get_Conn_Encrypt_Type()
{
return 4;
}