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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。
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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) ...
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How exactly do Django content types work?

...en models. Blah blah, let's dive into some code and see what I mean. # ourapp.models from django.conf import settings from django.db import models # Assign the User model in case it has been "swapped" User = settings.AUTH_USER_MODEL # Create your models here class Post(models.Model): author = m...
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Return HTTP status code 201 in flask

...sk import Response > return Response("{'a':'b'}", status=201, mimetype='application/json') share | improve this answer | follow | ...
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PCH File in Xcode 6

... buttons) Project > Build Settings > Search: "Prefix Header". Under "Apple LLVM 7.0" you will get the Prefix Header key. Type file directory. e.g: "$(SRCROOT)/$(PROJECT_NAME)/ProjectName-Prefix.pch". Clean project: ⌘cmd+⇧shift+K Build project: ⌘cmd+B ...
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OAuth 2.0: Benefits and use cases — why?

...ent provider (e.g. Facebook, Twitter, etc.) to assure a server (e.g. a Web app that wishes to talk to the content provider on behalf of the client) that the client has some identity. What three-legged authentication offers is the ability to do that without the client or server ever needing to know t...
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How is Docker different from a virtual machine?

...istine copy of the database and will make changes to the data. The classic approach to this is to reset the database after every test either with custom code or with tools like Flyway - this can be very time-consuming and means that tests must be run serially. However, with Docker you could create a...
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Re-enabling window.alert in Chrome

... For our application there are over 150 confirm windows that rely on the synchronous native confirms. We are planning on changing it, but that would result in us spending two weeks to go through each one of these cases. Plus testing,...
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Setting Corner Radius on UIImageView not working

...e layer property of UIView to round the corners of multiple elements in my app. However, this one UIImageView is simply not complying. Not sure what I am missing. ...
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How many bits or bytes are there in a character? [closed]

... some legacy apps still use 1 byte chars with local codepages, but all NT versions of Windows internally run with 2-byte characters (UCS-2 up to NT4, UTF-16 from Windows 2000 onwards, stored as wchar_t), not only Asian ones, and so should...