Domoticz

Maybe somebody can help to find a solution. I am trying to add a local variable to a json url command without success. The following command is working well and the RBG color will change.
os.execute('curl "http://127.0.0.1:8080/json.htm?type=com ... hite=false"')

but if I replace the hex value by a local variable the curl command end with an error.
os.execute('curl "http://127.0.0.1:8080/json.htm?type=com ... hite=false"')
I tried serveral things to to create first the the http string and store it to a variable but everything will fail.
What am I doing wrong? Please help

Post your lua script code in a codebox </> so we can see exactly what you coded and tell us the error you get.

Edited:
THIS DOES NOT WORK THIS WORK CORRECTLY!

@psubiaco
the first recommended line is not generating any error in the protocol, but it's also not doing anything.
the second one is working well. Thanks you saved me many hours of playing around

Ok, I've edited my post to let people solving this issue quickly.
Have a nice weekend!!