Publishing gps data to cloud (NEO6mv)

[ScruffR]

The GPS device continously sends data via the serial connection to the microcontroller but your code needs to read that data and feed it into the library via gps.encode() for the library to parse it. I can't see your code doing any of that.

@lunchboxp

PS Also, is there a way to send the long and lat values in one publish command rather than two?

Yes, the common way to wrap multiple variables into one string goes via snprintf()

Publishing several fields in one event

For float and double input variables snprintf() would require you to use something like "%.1f" instead of "%u". snprintf() uses the same formatting pattern as printf() %u stands for unsigned decimal integer - meaning an integer input type not to be confused with the output format.