Send mqtt payload via button

[grhsc]

Dear developer

In my case, the device operates through mqtt payload, so it is not like a factory, setting start and stop through 0,1
Instead, a load like this is used to start and stop the device
{“tagId”:”pump1″,”value”:1}
{“tagId”:”pump1″,”value”:0}

So I need to send string. Through settings, I have implemented a button on the screen. After clicking, a string input box pops up. After entering {“tagId”:”pump1″,”value”:1}, the device can be controlled.

But obviously such input is not user-friendly, and users need to enter different id values.
Is there a way to send {“tagId”:”pump1″,”value”:1} to the mqtt topic without manual input as long as an ON button is clicked.

If it works, I will define another button OFF with the content {“tagId”:”pump1″,”value”:0}

I guess it should be possible via formulas or other advanced functions, but I’m not quite familiar with it yet.
Looking forward to your help, thank you in advance.

[Mikhail]

Hello,

Add to the Scripts table:

public string GetPayload()
{
  return "{\"tagId\":\"pump1\",\"value\":" + CmdVal + "}";
}

Then use GetPayload() as an output formula of the channel.
Let me know if it works or not.

[grhsc]

Allow me to express my gratitude to you, not only for the effective and quick reply, but also for the wonderful design of rapidscada. Whenever I look forward to a feature, it has been designed.

[grhsc]

I have tested it and it works fine.
super perfect!
thanks again

[Mikhail]

Cool! It can be useful for many users 🙂

[Author]

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