How to write to thingspeak channel from thinghttp?

Hi everybody, I have successfully created a thinghttp that returns a number. It's running with time control. How can I write the number to a thingspeak channel?

[Christopher Stapels]

Do you use a device to get the number fom ThingHTTP? If yes, you can have the device write the number to a ThingSpeak channel.

If your ThingHTTP is interacting with an external website, you can rewrite it in MATLAB analysis using webread or webwrite. Then you can add thingSpeakWrite commands in the script to write it to your channel. You can trigger MATLAB analysis with TimeControl.

[Tobias Wagner]

Thanks for your comment. I'll check it out.

Answer 1

[Christopher Stapels]

If your ThingHTTP is interacting with an external website, you can rewrite it in MATLAB analysis using webread or webwrite. Then you can add thingSpeakWrite commands in the script to write it to your channel. You can trigger MATLAB analysis with TimeControl.

[Tobias Wagner]

Works great

import matlab.io.xml.dom.*

import matlab.io.xml.xpath.*

weboptions('Timeout',60);

data=webread("http://xxx/values.xml");

doc = parseString(Parser,data);

xpExpr = "//device[@id='AI03IV']/v1";

res = evaluate(Evaluator,xpExpr,doc);

b0 = res.getTextContent()

xpExpr = "//device[@id='AI05IV']/v1";

res = evaluate(Evaluator,xpExpr,doc)

lake = res.getTextContent()

xpExpr = "//device[@id='AI04IV']/v1";

res = evaluate(Evaluator,xpExpr,doc)

filtr = res.getTextContent()

data = [str2num(b0),str2num(lake),str2num(filtr)]

response = thingSpeakWrite(xxx,data,'WriteKey','xxx')