# want_udp_status is a 14-byte string with numbers in little-endian order:
# [0:2] 'St'
# [2:6] Rx tune phase
# [6:10] Tx tune phase
# [10] Tx output level 0 to 255
# [11] Tx control bits:
#   0x01 Enable CW transmit
#   0x02 Enable all other transmit
#   0x04 Use the HiQSDR extended IO pins not present in the 2010 QEX ver 1.0
#   0x08 The key is down (software key)
# [12] Rx control bits. Second stage decimation less one, 1-39, six bits
# [13] zero or firmware version number. The above is used for firmware version 1.0; add eight more bytes for version 1.1:
# [14] X1 connector: Preselect pins 69, 68, 65, 64; Preamp pin 63, Tx LED pin 57
# [15] Attenuator pins 84, 83, 82, 81, 80
# [16] More bits: AntSwitch pin 41 is 0x01
# Remaining five bytes are sent as zero. For version 1.2 include the VNA scan count:
# [17] .. [21] Remaining five bytes are sent as zero.

# want_udp_status is a 14-byte string with numbers in little-endian order: