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Title: Scan Device QR Code for Pairing

participant Device
participant httpdns
participant mqtt
participant APP
participant cloud

Note over Device: Power on device and connect it to internet
Note over Device: Reset device to be paired

Device -> httpdns: Select HTTP DNS and request mqttsUrl domain name
httpdns -> Device: Return mqttsUrl domain name
Device -> mqtt: Use UUID to connect to mqtt

APP -> Device: Scan device QR code
APP -> cloud: Get device UUID and request a token from the cloud
APP -> cloud: Pool activated device with token

cloud -> mqtt: Push token and region
mqtt -> Device: Pass token and region to device

Device -> cloud: Request to activate device
cloud -> Device: Activated successfully

cloud-->APP: Activated successfully with paired device list returned

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/**
 *  To obtain token with uuid  (valid for 10 minutes)
 *
 *  @param uuid    Device uuid
 *  @param homeId  Home Id
 *  @param success Success block
 *  @param failure Failure block
 */
- (void)getTokenWithUUID:(NSString *)uuid
                  homeId:(long long)homeId
                 success:(TYSuccessString)success
                 failure:(TYFailureError)failure;

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 [[TuyaSmartActivator sharedInstance] getTokenWithUUID:uuid homeId:homeId success:^(NSString *result) {
       // get token
    } failure:^(NSError *error) {
        
    }];

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/**
 *  start config (Wireless config)
 *
 *  @param mode     Config mode, EZ or AP
 *  @param ssid     Name of route
 *  @param password Password of route
 *  @param token    配网 Token
 *  @param timeout  Timeout, default 100 seconds
 */
- (void)startConfigWiFi:(TYActivatorMode)mode
                   ssid:(NSString *)ssid
               password:(NSString *)password
                  token:(NSString *)token
                timeout:(NSTimeInterval)timeout;

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[[TuyaSmartActivator sharedInstance] startConfigWiFi:TYActivatorModeEZ ssid:@"" password:@"" token:self.token timeout:Timeout];

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/**
 Callback of Config Network Status Update

 @param activator   instance
 @param deviceModel deviceModel
 @param error       error
 */
- (void)activator:(TuyaSmartActivator *)activator didReceiveDevice:(TuyaSmartDeviceModel *)deviceModel error:(NSError *)error;

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[TuyaSmartActivator sharedInstance].delegate = self;

- (void)activator:(TuyaSmartActivator *)activator didReceiveDevice:(TuyaSmartDeviceModel *)deviceModel error:(NSError *)error {
      // get deviceModel 
}