# ------------------------------------------
# BDS 1,7
# Common usage GICB capability report
# ------------------------------------------
from pyModeS import common
[docs]def is17(msg):
"""Check if a message is likely to be BDS code 1,7
Args:
msg (str): 28 hexdigits string
Returns:
bool: True or False
"""
if common.allzeros(msg):
return False
d = common.hex2bin(common.data(msg))
if common.bin2int(d[28:56]) != 0:
return False
caps = cap17(msg)
# basic BDS codes for ADS-B shall be supported
# assuming ADS-B out is installed (2017EU/2020US mandate)
# if not set(['BDS05', 'BDS06', 'BDS08', 'BDS09', 'BDS20']).issubset(caps):
# return False
# at least you can respond who you are
if "BDS20" not in caps:
return False
return True
[docs]def cap17(msg):
"""Extract capacities from BDS 1,7 message
Args:
msg (str): 28 hexdigits string
Returns:
list: list of support BDS codes
"""
allbds = [
"05",
"06",
"07",
"08",
"09",
"0A",
"20",
"21",
"40",
"41",
"42",
"43",
"44",
"45",
"48",
"50",
"51",
"52",
"53",
"54",
"55",
"56",
"5F",
"60",
"NA",
"NA",
"E1",
"E2",
]
d = common.hex2bin(common.data(msg))
idx = [i for i, v in enumerate(d[:28]) if v == "1"]
capacity = ["BDS" + allbds[i] for i in idx if allbds[i] is not "NA"]
return capacity