蓝牙连接报错该如何处理？

import { BusinessError } from '@kit.BasicServicesKit' 
import socket from '@ohos.bluetooth.socket'; 
import connection from '@ohos.bluetooth.connection'; 
import { abilityAccessCtrl, common, PermissionRequestResult, Permissions } from '@kit.AbilityKit'; 
 
@Component 
@Entry 
export struct DSRefresh { 
 
  permissions: Array<Permissions> = ['ohos.permission.ACCESS_BLUETOOTH']; 
 
  reqPermissionsFromUser(permissions: Array<Permissions>): void { 
    let context: Context = getContext(this) as common.UIAbilityContext; 
    let atManager: abilityAccessCtrl.AtManager = abilityAccessCtrl.createAtManager(); 
    // requestPermissionsFromUser会判断权限的授权状态来决定是否唤起弹窗 
    atManager.requestPermissionsFromUser(context, permissions).then((data: PermissionRequestResult) => { 
      let grantStatus: Array<number> = data.authResults; 
      let length: number = grantStatus.length; 
      for (let i = 0; i < length; i++) { 
        if (grantStatus[i] === 0) { 
          // 用户授权，可以继续访问目标操作 
        } else { 
          // 用户拒绝授权，提示用户必须授权才能访问当前页面的功能，并引导用户到系统设置中打开相应的权限 
          return; 
        } 
      } 
      // 授权成功 
    }).catch((err: BusinessError) => { 
      console.error(`Failed to request permissions from user. Code is ${err.code}, message is ${err.message}`); 
    }) 
  } 
 
  aboutToAppear(): void { 
    this.reqPermissionsFromUser(this.permissions) 
  } 
  build() { 
    Column() { 
      Button() 
        .onClick(() => { 
          let devices: Array<string> = [] 
          try { 
            devices = connection.getPairedDevices(); 
          } catch (err) { 
            console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message); 
          } 
          if(devices.length ==0){ 
            return 
          } 
          socket.sppConnect(devices[0], { 
            uuid: '00001101-0000-1000-8000-008xxxB34FB', 
            secure: true, 
            type: 0 
          }, (code, socketID) => { 
            if (code != null) { 
              console.error('sppConnect error, code = ' + (code as BusinessError).code); 
              return; 
            } 
            console.info('sppConnect success, socketId = ' + socketID); 
          }) 
        }) 
        .height('100%') 
    } 
  } 
}
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