import requests

unit_ip = '192.168.0.172'
hex_data = '\x00\x01\x02'

# Flex firmware 21 or earlier
url = 'http://' + unit_ip + '/api/host/modules/1/ports/1/data'
# Global Connect or Flex firmware 22 or later
#url = 'http://' + unit_ip + '/api/host/modules/1/serial/ports/1/data'

#Execute request
requests.post(url,data=hex_data,headers={'Content-Type': 'text/plain; charset=UTF-8'})