WLED.py

#!/usr/bin/python3

import os,time

# {"seg":{"i":[0,"FF0000",1,"00FF00",2,"FFFFFF",3,"FF0000"]}}

led_count = 200
wled_ip = '192.168.10.11'

#curl --header "Content-Type: application/json" \
#--request POST \
#--data "$DATA" \
#http://$IP_ADDRESS/json

color_array = ['"FF0000"', '"00FF00"', '"FFFFFF"']

while True:
    output_prefix = '{"seg":{"i":['
    output_suffix = ']}}'
    output_colors = ''

    for led in range(0,led_count):
        if led > 0:
            output_colors = output_colors+","
        output_colors = output_colors+str(led)+","+color_array[led % 3]

    output_string = (output_prefix+output_colors+output_suffix).replace('"','\\"')

    os.system('curl -s -o /dev/null --header "Content-Type: application/json" --request POST --data "'+output_string+'" http://'+wled_ip+'/json')
    color_array = color_array[1:] + color_array[: 1]
    time.sleep (1)