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标题: MQTT报文多个数据的提取 [打印本页]

作者: dou454 时间: 昨天 14:49
标题: MQTT报文多个数据的提取
想做个订阅MQTT，采集的APP，怎么才能正确的连接mqtt服务器并订阅主题，把对应的数据按顺序提取到标签1，标签2，标签3……我把画面和mqtt订阅的数据发上来，求解救！！

(, 下载次数: 3) (, 下载次数: 3)

{
  "RTValue": [
{
   "name": "GQ-YIWANG-CHU-WD",
   "value": 75.45,
   "type": 16,
   "quality": 1,
   "timestamp": 1772424139
},
{
   "name": "GQ-YIWANG-HUI-WD",
   "value": 35.02,
   "type": 16,
   "quality": 1,
   "timestamp": 1772423665
},
{
   "name": "GQ-ERWANG-CHU-WD",
   "value": 37,
   "type": 16,
   "quality": 1,
   "timestamp": 1772424394
},
{
   "name": "GQ-ERWANG-HUI-WD",
   "value": 35.2,
   "type": 16,
   "quality": 1,
   "timestamp": 1772424073
},
{
   "name": "GQ-YIWANG-CHU-YL",
   "value": 0.24,
   "type": 16,
   "quality": 1,
   "timestamp": 1772424355
},
{
   "name": "GQ-YIWANG-HUI-YL",
   "value": 0.24,
   "type": 16,
   "quality": 1,
   "timestamp": 1772424376
},
{
   "name": "GQ-ERWANG-CHU-YL",
   "value": 0.51,
   "type": 16,
   "quality": 1,
   "timestamp": 1772424328
},
{
   "name": "GQ-ERWANG-HUI-YL",
   "value": 0.46,
   "type": 16,
   "quality": 1,
   "timestamp": 1772424391
},
{
   "name": "GQ-XHB-PL-GD-DU",
   "value": 38,
   "type": 16,
   "quality": 1,
   "timestamp": 1772424301
},
{
   "name": "YIWANG-CHU-WD",
   "value": 75.85,
   "type": 16,
   "quality": 1,
   "timestamp": 1772424273
},
{
   "name": "YIWANG-HUI-WD",
   "value": 35.62,
   "type": 16,
   "quality": 1,
   "timestamp": 1772424372
},
{
   "name": "ERWANG-CHU-WD",
   "value": 40.9,
   "type": 16,
   "quality": 1,
   "timestamp": 1772424393
},
{
   "name": "ERWANG-HUI-WD",
   "value": 34.7,
   "type": 16,
   "quality": 1,
   "timestamp": 1772424378
},
{
   "name": "YIWANG-CHU-YL",
   "value": 0.25,
   "type": 16,
   "quality": 1,
   "timestamp": 1772424375
},
{
   "name": "YIWANG-HUI-YL",
   "value": 0.23,
   "type": 16,
   "quality": 1,
   "timestamp": 1772424351
},
{
   "name": "ERWANG-CHU-YL",
   "value": 0.5,
   "type": 16,
   "quality": 1,
   "timestamp": 1772424381
},
{
   "name": "ERWANG-HUI-YL",
   "value": 0.42,
   "type": 16,
   "quality": 1,
   "timestamp": 1772424387
},
{
   "name": "XHB-PL-GD-DU",
   "value": 38,
   "type": 16,
   "quality": 1,
   "timestamp": 1772351919
}
  ]
}

作者: App Inventor 2 时间: 昨天 21:17
(, 下载次数: 0)

见上面代码块，解析json，拿出数据项，是一个列表，拿出第一项目中的value，结果是：75.45

要取其他项的数据，改动上面的索引值即可。

其他类似的帖子：https://bbs.tsingfun.com/thread-2631-1-1.html

作者: dou454 时间: 昨天 22:37

App Inventor 2 发表于 2026-03-02 21:17
见上面代码块，解析json，拿出数据项，是一个列表，拿出第一项目中的value，结果是：75.45

要取其他项的 ...

上面关于MQTT的设置没问题了吗我是新手麻烦你了

作者: App Inventor 2 时间: 昨天 22:51

dou454 发表于 2026-03-02 22:37
上面关于MQTT的设置没问题了吗我是新手麻烦你了

新手的话，建议先跟着教程做一遍，跑通了再考虑json数据的解析：https://www.fun123.cn/reference/iot/MQTTGuide.html

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