Sending all fields data with Mqtt

2024 2 6
1 个回答
更新时间：2024 3 5
12 次查看（30 天）

0 个投票

When using Rest api there is a neat feature whereby you can send data to fields of a channel by doing this in the thingspeakwrite ....[11,12,13,14,15,16,17,18] //where the field1 = 1, field2= 2 etc.
It appears that in Mqtt , the syntaxt must be field1= 1, filed2 etc which seems verbose. Can the data be sent using Mqtt in a syntax like PublishString= ...... ChannelID,[11,12,13,14,15,16,17,18], API_Key=mychannelkey;

请先登录，再回答此问题。

回答（1 个）

0 个投票

Yes, there is a multiple field syntax. See the publish to channel field doc.
In the Payload pane, use the following settings:
Topic: channels/33301/publish
Payload: field1=45&field2=60&status=MQTTPUBLISH

2 个评论
显示 无 隐藏 无

Marc Hanssens
Marc Hanssens 2024-3-4
Hi Christopher,
Thanks for the reply. I think that I didn't phase my question correctly.
In your example :Payload: field1=45&field2=60&status=MQTTPUBLISH you are passing the values 45 and 60 to fields 1 & 2 respectively.
I would like to pass the values in less verbose way and do something similar to thingspeakwrite, like: Payload: [45,60]&status=MQTTPUBLISH
is this possible with MQTT?
thingSpeakWrite is a function in MATLAB, though it does use the REST API in the background.. You can definitely write MATLAB functions to simplify your code, but you will need to keep them in your MATLAB analysis or visualizations code (you cant yet call custom functions in your ThingSpeak code, though you can in MATLAB online). You can use MATLAB to communicate with ThingSpeak via MQTT. The syntax you use inside your functions will still need to be what is shown above.

请先登录，再进行评论。

类别

在 帮助中心 和 File Exchange 中查找有关 Introduction to Installation and Licensing 的更多信息

产品

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by