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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。
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) ...
How can I get the baseurl of site?
...aseUrl = Request.Url.Scheme + "://" + Request.Url.Authority +
Request.ApplicationPath.TrimEnd('/') + "/";
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Save string to the NSUserDefaults?
... ? thanks but your code works as same as mine , I create a custom calendar app which user can write their notes in it , for example in 3 Feb user writes something and this text should be saved in 3 Feb , and when user move to the another days he/she could write something else accruing to thad day da...
Keyword not supported: “data source” initializing Entity Framework Context
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This appears to be missing the providerName="System.Data.EntityClient" bit. Sure you got the whole thing?
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How to convert an int array to String with toString method in Java [duplicate]
...d posted the answer. It was specific to a problem I needed to solve for an app I'm porting, but might save someone some time.
– clearlight
Sep 24 '15 at 1:48
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What are the key differences between Meteor, Ember.js and Backbone.js? [closed]
... get a reply from him.
I'd say if you are looking to learn this style of application development then on the one hand, the wealth of open source backbone examples around could be good for you. But on the other hand, although new, the Ember package is actually more complete IMO than backbone.
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Check for current Node Version
...{
"check-version" : "node checkVersion.js",
"start-server" : "node app.js"
"start" : "npm run check-version && npm run start-server",
"test": "npm run check-version && echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC",
"dep...
Is there a C++ decompiler? [closed]
...he decompiled source with assembler blocks inside, than rewriting your old app from scratch.
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Remove an onclick listener
...mory allocation ? Do we need to free them ? Will that raise performance of app ?
– alicanbatur
Nov 4 '13 at 11:42
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