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使用App Inventor 2 控制物联网设备/低功耗蓝牙设备(BLE) · App Inventor 2 中文网
...组相似特征的组合，其中每个服务通过通用唯一标识符 (UUID) 来区分其他服务。 与服务类似，特征也通过其自己唯一的数字 UUID [7] 来区分自己。 图 3 显示了服务和特征的层次性质，其中特征位于 GATT 事务的最低级别。 客户端依...
Arduino101（Genuino 101）&App Inventor – RGB LED控制 - 创客硬件开...
... BLE AnalogRead Service
// BLE LED Switch Characteristic - custom 128-bit UUID, read and writable by central
BLEUnsignedIntCharacteristic LEDStatus("19B10011-E8F2-537E-4F6C-D104768A1214", BLERead | BLEWrite );
int incom = 0;
int r, g, b ;
void setup() {
Serial.beg...
How to handle many-to-many relationships in a RESTful API?
...going to make that easier.
Relationship IDs probably ought to be based on UUIDs or something equally long and random, irrespective of whatever type of IDs you use for teams and players. That will let you use the same UUID as the ID component for each end of the relationship without worrying about c...
Rails: How can I set default values in ActiveRecord?
...
You can also pass a lambda to the default parameter. Example:
attribute :uuid, :string, default: -> { SecureRandom.uuid }
The second argument is the type and it can also be a custom type class instance, for example:
attribute :uuid, UuidType.new, default: -> { SecureRandom.uuid }
...
do N times (declarative syntax)
...
For piece of mind I ran a uuid function 50k times to make sure it never duplicated a uuid. So I profiled the top loop vs the bottom just for kicks, just running in the middle of a normal page load using chrome dev tools if im not being dumb I think it...
Client-server synchronization pattern / algorithm?
...ique when items could be created on different devices. I didn't know about UUIDs when I started this, so I used auto-incrementing IDs and wrote some convoluted code that runs on the central server to check new IDs uploaded from devices, change them to a unique ID if there's a conflict, and tell the ...
C++代码质量扫描主流工具深度比较 PDF - 文档下载 - 清泛网 - 专注C/C++及内核技术
...结果展示。
以下重点比较具体检查规则和有效问题报错率。
三、检查规则大比拼
3.1规则大类
针对业内大量扫描工具在实际项目中扫描结果的影响比较，我们将代码质量问题分为以下几大类：
①致命...
【解决】undefined reference to \'apr_thread_rwlock_destory\'、undefine...
...ialize'undefined_reference_apr1、首选确认安装了apr及apr-util否则报错<apr-1 apr_xxx h>头文件找不到。2、-lapr-1 -laprutil-1添加库链接，否则报错：undefined reference to & 39;apr_thread_rwlock_de 1、首选确认安装了apr及apr-util
否则报错“<apr-1/apr_xxx.h>...
App Inventor 2 低功耗蓝牙 BlueToothLE 拓展之：RequestMTU是否有上限？ -...
RequestMTU
没反应,是不是因为这个值1024太大了
1024没触发,64触发了
MTU设64不报错,设100报错 128报错.256不报错.
----
连上后，调用，没有触发回调？
待调查研究这个函数是否有上限。
无法打包成apk - App应用开发 - 清泛IT社区，为创新赋能！
...半，大约300多k的时候可以顺利打包打包用的哪个平台？报错信息截图看一下App Inventor 2 发表于 2025-03-02 11:22
打包用的哪个平台？报错信息截图看一下
用的是离线版
App Inventor 2 发表于 2025-03-02 11:22
打包用的哪...