if (len(data) > 1024):
raise Exception(f'Data packet too large, data length is {DATA_LEN} (>1024)')
LNH, LNL, SUM = calc_sum(int(res), data)
if (len(data) > 1024):
raise Exception(f'Data packet too large, data length is {DATA_LEN} (>1024)')
LNH, LNL, SUM = calc_sum(int(res), data)