大约有 40,000 项符合查询结果（耗时：0.0571秒） [XML]
MQTT相关知识研究笔记 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...4、MQTT测试客户端：
不用挑选了，就它 MQTTX：https://mqttx.app/zh
创建并发送BLE蓝牙广播 - 创客硬件开发 - 清泛IT社区，为创新赋能！
在MIT App Inventor社区的一篇帖子中，用户尝试使用最新的BLE扩展来创建和发送蓝牙广播，但遇到了一些问题。Evan Patton指出，Android的BLE子系统需要使用16位UUID，并提供了一个测试版的BLE扩展，解决了广播发送失败的问题。
以下...
【客户反馈】增加直接改项目名称的功能 - 用户反馈 - 清泛IT社区，为创新赋能！
...了，编译通过。 rename后再另存，就不行。
修复中。。。App Inventor 2 发表于 2024-08-30 09:29
rename 没有真正改名，编译仍然失败
另存为 是彻底改了，编译通过。 rename后再另存，就不行。
修复中。。 ...
改名功能...
MQTT支持获取设备端的在线状态吗？ - 创客硬件开发 - 清泛IT社区，为创新赋能！
mqtt拓展支持获取设备端的在线状态吗？这里仅仅提供一个思路：
设备状态是设备的一项数据，这个也需要设备上报其状态数据给app端，类似网络的心跳包，定时上报状态数据，一定时间没取到数据就认为设备离线。
micro:bit 连接报错 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...错了。
运行故障
java.lang.ExceptionInInitializerError at edu.mit.appinventor.ble.BluetoothLEint$BLEReadOperation.subscribeBluetoothLEint.java:357) at
edu.mit.appinventor.ble.BluetoothLEintSBLEReadOperation.run(BluetoothLEint.java:325) at android.os.Handler.handleCallback(Handler.java:1013) ...
What is Normalisation (or Normalization)?
...
Normalization is basically to design a database schema such that duplicate and redundant data is avoided. If some piece of data is duplicated several places in the database, there is the risk that it is updated in one place but not the other, lead...
Why is there extra padding at the top of my UITableView with style UITableViewStyleGrouped in iOS7
...he tableView's tableHeaderView = nil.
Because my tableView has a dynamically appearing tableHeaderView, when I need to hide the tableHeaderView, instead of doing self.tableView.tableHeaderView = nil;, I do:
self.tableView.tableHeaderView = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, sel...
How do I declare a global variable in VBA?
...
I tried all the other suggestions about "scope" and none worked. The only thing that worked was a new Module specifically for global vars and it works!
– Fandango68
Sep 27 '19 at 4:23
...
Force R not to use exponential notation (e.g. e+10)?
...
This is a bit of a grey area. You need to recall that R will always invoke a print method, and these print methods listen to some options. Including 'scipen' -- a penalty for scientific display. From help(options):
‘scipen’: integer. A penalty to be applied wh...
Git Blame Commit Statistics
... path or modify your path and use it like
git authors '*/*.c' # look for all files recursively ending in .c
git authors '*/*.[ch]' # look for all files recursively ending in .c or .h
git authors 'Makefile' # just count lines of authors in the Makefile
Original Answer
While the accepted answer d...