iOS 蓝牙写入数据类型选择 CBCharacteristicW

if(characteristic.properties & CBCharacteristicPropertyWriteWithoutResponse){

        [p writeValue:data forCharacteristic:characteristic type:CBCharacteristicWriteWithoutResponse];

    }else{

        [p writeValue:data forCharacteristic:characteristic type:CBCharacteristicWriteWithResponse];

    }