ehs new function
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@ -205,6 +205,53 @@ def pbaro(msg):
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return p
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# ------------------------------------------
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# DF 20/21, BDS 4,0
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# ------------------------------------------
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def isBDS44(msg):
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"""Check if a message is likely to be BDS code 4,4
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Meteorological routine air report
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Args:
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msg (String): 28 bytes hexadecimal message string
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Returns:
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bool: True or False
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"""
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# status bit 5, 15, 24, 36, 49
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d = util.hex2bin(data(msg))
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result = True
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result = result & checkbits(d, 5, 6, 14) \
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& checkbits(d, 15, 16, 23) & checkbits(d, 24, 25, 35) \
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& checkbits(d, 36, 37, 47) & checkbits(d, 49, 50, 56)
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return result
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def wind(msg):
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"""reported wind speed and direction
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Args:
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msg (String): 28 bytes hexadecimal message (BDS44) string
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Returns:
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(int, float): speed (kt), direction (degree)
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"""
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d = util.hex2bin(data(msg))
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status = int(d[4])
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if not status:
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return None
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speed = util.bin2int(d[5:14]) # knots
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direction = util.bin2int(d[15:23]) * 180.0 / 128.0 # degree
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return round(speed, 0), round(direction, 1)
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# ------------------------------------------
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# DF 20/21, BDS 5,0
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# ------------------------------------------
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