HarmonyOS 实现蓝牙连接打印机发送数据

操作步骤：1、调用蓝牙连接方法报BussinessError 2900003: Bluetooth switch is off.蓝牙开关是开启的。

onConnect(address: string) {
  let sppOption:socket.SppOptions = {uuid: '00001810-0000-1000-8000-00805F9B34FB', secure: false, type: 0};
  try {
    socket.sppConnect(address, sppOption, (code: BusinessError, number: number) => {
      if (code) {
        console.error('sppListen error, code is ' + code);
        return;
      } else {
        console.log('bluetooth serverSocket Number: ' + number);
        // 获取的clientNumber用作客户端后续读/写操作socket的id。
        this.clientNumber = number;
      }
    });
  } catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
  }
}