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

1. 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
   
2. 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; }