微信版本为 8.0.12.43 基础库版本为 3.11.2 手机系统版本为 6.0.0.110SP8

// 写入蓝牙打印机

function writeBLECharacteristicValue(buffer) {

  return new Promise((resolve, reject) => {

    const deviceId = printer.deviceId;

    serviceId = serviceId;

    const characteristicId = findList[0].uuid;

    uni.writeBLECharacteristicValue({

      deviceId,

      serviceId,

      characteristicId,

      value: buffer,

      success: (res) => {

        console.log("写入成功", JSON.stringify(res));

        resolve(res);

      },

      fail: (e) => {

        console.log("写入失败", JSON.stringify(e));

        reject(e);

      },

    });

  });

}