REST API arguments - is there a better way?

[ScruffR]

@Ludocomito

so could you be so kind to post the correct code?

We see ourselves more as enablers and educators not as coder-bots.
I've pointed you in your other thread to some functions.

Read data from xml file

That’s normal string parsing. Scan for TOT=" and take the portion up to ". I’d use strstr() for finding the first part and then again strstr() or strpbrk(). Or, if you want the numeric value, locate the beginning (as above) and then take the string after TOT=" into atof() or strtod() Or you use the way shown in the docs https://docs.particle.io/tutorials/topics/webhooks/#the-firmware-1

You just need to investigate and look at the samples in the provided links.

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One additional hint for above code could be the use of strlen()

void myHandler(const char *event, const char *data) // pointers to so-called c-string arrays 'event' and 'data' are passed to the handler function
{
  char myData[strlen(data)+1] = ""; //create a string array big enough to capture what's pointed to by 'data'
  strncpy(myData, data, sizeof(myData));  // copy whats pointed to by 'data' to 'myData', this function will not overflow the size of myData
  ...
  // parse to get what you need from myData;
  ...
}