def decode_nmea(self, strings):
for msg in strings:
msg_dict = ais_nmea_regex.search(msg).groupdict()
if msg_dict['checksum'] != nmea_checksum_hex(msg):
raise AisUnpackingException('Checksum failed')
try:
msgs = [ais_nmea_regex.search(line).groupdict() for line in strings]
except AttributeError:
raise AisUnpackingException('One or more NMEA lines were malformed (1)')
if None in msgs:
raise AisUnpackingException('Failed to parse message.')
bits = []
for msg in msgs:
msg['fill_bits'] = int(msg['fill_bits'])
bv = binary.ais6tobitvec(msg['body'])
if int(msg['fill_bits']) > 0:
bv = bv[:-msg['fill_bits']]
bits.append(bv)
bits = binary.joinBV(bits)
self.decode_bits(bits)
buf = StringIO.StringIO()
for field in options.fieldList:
buf.write(field + ',')
result = buf.getvalue()
if result[-1] == ',': print result[:-1]
else: print result
if options.doDecode:
if len(args) == 0: args = sys.stdin
for msg in args:
bv = None
if msg[0] in ('$', '!') and msg[3:6] in ('VDM', 'VDO'):
# Found nmea
# FIX: do checksum
bv = binary.ais6tobitvec(msg.split(',')[5])
else: # either binary or nmeapayload... expect mostly nmeapayloads
# assumes that an all 0 and 1 string can not be a nmeapayload
binaryMsg = True
for c in msg:
if c not in ('0', '1'):
binaryMsg = False
break
if binaryMsg:
bv = BitVector(bitstring=msg)
else: # nmeapayload
bv = binary.ais6tobitvec(msg)
params = decode(bv)
#print 'params:',params
printFields(params,
buf = StringIO.StringIO()
for field in options.fieldList:
buf.write(field+',')
result = buf.getvalue()
if result[-1] == ',': print result[:-1]
else: print result
if options.doDecode:
if len(args)==0: args = sys.stdin
for msg in args:
bv = None
if msg[0] in ('$','!') and msg[3:6] in ('VDM','VDO'):
# Found nmea
# FIX: do checksum
bv = binary.ais6tobitvec(msg.split(',')[5])
else: # either binary or nmeapayload... expect mostly nmeapayloads
# assumes that an all 0 and 1 string can not be a nmeapayload
binaryMsg=True
for c in msg:
if c not in ('0','1'):
binaryMsg=False
break
if binaryMsg:
bv = BitVector(bitstring=msg)
else: # nmeapayload
bv = binary.ais6tobitvec(msg)
printFields(decode(bv)
,out=outfile
,format=options.outputType
def decode_aivdm(msg):
bv = binary.ais6tobitvec(msg.split(',')[5])
print decode(bv)
from BitVector import BitVector
import binary
import ais_msg_1, ais_msg_8
import sls.waterlevel
if __name__=='__main__':
# Try to parse some binary message
if False:
#nmeaStr='!BSVDM,1,1,,A,85MwpwQKf22M=5KEn7IONkp9nkF5PtBao=COt6;QOuwk82>:tltI,0*01,r003669717,1165850285'
nmeaStr='!AIVDM,1,1,,A,85OpLV1Kf98p96dWWPLSViUfJlU@SV>cDF2Wq5>`=u8CnEFGCIOq,0*70,r003669983,1165795916'
msgPayload = nmeaStr.split(',')[5]
print 'nmea string: ',nmeaStr
print 'message payload:',msgPayload
bv = binary.ais6tobitvec(msgPayload)
print len(bv), bv
msgDict = ais_msg_8.bin_broadcastDecode(bv)
ais_msg_8.bin_broadcastPrintFields(msgDict)
bv = bv[39:]
print 'dac: ',bv[:10],int(bv[:10])
bv = bv[10:]; print 'fid: ',bv[: 6],int(bv[: 6])
bv = bv[ 6:]; print 'bits:',bv[:16],int(bv[:10])
bv = bv[10:]; print 'len: ',len(bv)
# Position message
if False:
nmeaStr = '!AIVDM,1,1,,B,15Mt9B001;rgAFhGKLaRK1v2040@,0*2A'
def decode_aivdm(msg):
bv = binary.ais6tobitvec(msg.split(',')[5])
print decode(bv)
Run a water level message from NMEA to decoded
'''
import sys
from BitVector import BitVector
import binary
import ais_msg_8
#import sls.header
import sls.waterlevel
if __name__=='__main__':
print 'FIX: broken'
vdm='!AIVDM,1,1,4,A,8030ot1?0@>PSpPPPC<2<oURAU=>T08f@02PSpPPP3C3<oU=d5<U00BH@02PSpPPP3C3EoU:A5<TwPPO@02PSpPPP2hk<oRWU5;si0Pl@02O<0PPPP3D<oPPEU;M418g@02PSpPPP2hlEoRQgU;j@17p@00,2*32'
msg=vdm.split(',')[5]
bvMsg = binary.ais6tobitvec(msg)
msg8 = ais_msg_8.decode(bvMsg)
bvMsg8 = msg8['BinaryData']
del msg8['BinaryData']
ais_msg_8.printFields(msg8)
print
# Now deal with the St Lawrence Seaway Header
slsHdr = sls_header.decode(bvMsg8)
bvHdr = slsHdr['BinaryData']
del slsHdr['BinaryData']
sls_header.printFields(slsHdr)
#print slsHdr.keys()
