Setting colors on a Cosna LED speaker

gistfile1.txt

# -*- coding: utf-8 -*-
import bluetooth
import serial
import time
import binascii

# bytes:
# 1 length: 0x0a
# 2 random: r 
# 3 c_-94 xor r
# 4 source xor r (8 for picker, 18 for something else?)
# 5 red xor r
# 6 green xor r
# 7 blue xor r
# 8 0 xor r
# 9 0 xor r
# 10 checksum: 0- (length+r+b3+b4+b6+b7+b8+b9+b10)
def generate_hexstring( r, g, b, random = 0xff, source = 8 ):
	length, rc94, rsource = 0x0a, (256-94)^random, source^random
	rred, rblue, rgreen = r^random, g^random, b^random
	rzero = 0^random
	checksum = (length+random+rc94+rsource+rred+rgreen+rblue+rzero+rzero)%256
	return bytearray( [length, random, rc94, rsource, rred,
			   rgreen, rblue, rzero, rzero, 256-checksum ] )

bt_remote_addr = "00:E0:4C:XX:XX:XX"

print "connecting and sending switch commands"

sockfd = bluetooth.BluetoothSocket(bluetooth.RFCOMM)
sockfd.connect((bt_remote_addr, 1)) # BT Address

print "color"
hex = generate_hexstring( 0xf3, 0xf6, 0xf9 )
sockfd.send( binascii.hexlify(hex).decode('hex') )
sockfd.send('\r')
time.sleep( 3)

sockfd.send(chr(26)) # CTRL+Z
sockfd.close()