Decode Anova Precision Cooker WiFi Packets

fuckuanova.py

#!/usr/bin/python3

import math

f = open("rawdump.txt", "r")

for l in f.readlines():
    p = 0
    chars = []
    chksum = 0
    for i in range(0, len(l), 2):
        line = l[i:i+2]
        if line != "\n":
            byte = int(line, 16)
            p += 1
            if p == 2:
                print("Len: {}".format(byte))
            if p == math.floor((len(l)/2) - 1):
                chksum = chksum & ((2**8) - 1)
                if byte == chksum:
                    print("Chksum: OK")
                else:
                    print("Chksum: FAIL. Read: {} != calc'd: {}".format(line, chksum))
            if p >= 3 and p < (len(l)/2) - 2:
                chksum += byte
                n = (p - 2) % 7
                byte = byte >> (n) | ((byte & (2**n)-1) << 8-n)
                chars.append(chr(byte))
    print("{}\n".format(''.join(chars)))