Sending Float/Double values result in empty payload

[adafruit]

Sending Float/Double values result in empty payload

[ductsoup]

I'm having the same experience with a Feather M0. Here's the problem and the solution I think.

Adapting Sketches to M0

Adafruit_MQTT.cpp

#if defined(ARDUINO_SAMD_ZERO) || defined(ARDUINO_SAMD_MKR1000)
static char *dtostrf (double val, signed char width, unsigned char prec, char *sout) {
  char fmt[20];
  sprintf(fmt, "%%%d.%df", width, prec);
  sprintf(sout, fmt, val);
  return sout;
}
#endif

The library relies on sprintf which compiles fine but doesn't work on Feather M0 for float/double. Just tested the workaround, it looks good.

[stelgenhof]

Thanks! I remember creating a similar workaround but didn't work. Let me try yours :) Anyway would be nice if it could be incorporated in the main source

[ladyada]

this is good now...i tested it and it works on m0+winc1500
plz reopen if not