Sends binary data to the SigFox’s backend. This data is sent as a byte or series of bytes; to send the characters representing the digits of a number use the print() function instead.
SigFox.write(val)
SigFox.write(str)
SigFox.write(buf, len)
val: a value to send as a single byte
str: a string to send as a series of bytes
buf: an array to send as a series of bytes
len: the length of the buffer