def buildNmea(aisBits,
prefix='!',
serviceType='AI',
msgType='VDM',
channelSeq=None,
channel='A'):
'''
Create one long oversized nmea string for the bits
@param aisBits: message payload
@type aisBits: BitVector
@param prefix: '!' or '$' what is the difference?
@param serviceType: 'can this be anything other than AI?
@param msgType: VDM. Should not be VDO (own ship)
@param channelSeq: 1-9 or None
@param channel: AIS channel A or B
@todo: sync names of prefix and serviceType to NMEA spec.
@see: reference the appropriate spec documents for all this stuff.
'''
rList = [prefix, serviceType, msgType, ',1,1,']
if None != channelSeq: rList.append(str(channelSeq))
rList.append(',')
rList.append(channel)
rList.append(',')
payloadStr, pad = binary.bitvectoais6(aisBits) #[0]
rList.append(payloadStr)
rList.append(',' + str(pad))
rStr = ''.join(rList)
rStr += '*' + checksumStr(rStr)
return rStr
def buildNmea(aisBits,prefix='!',serviceType='AI',msgType='VDM',channelSeq=None,channel='A'):
'''
Create one long oversized nmea string for the bits
@param aisBits: message payload
@type aisBits: BitVector
@param prefix: '!' or '$' what is the difference?
@param serviceType: 'can this be anything other than AI?
@param msgType: VDM. Should not be VDO (own ship)
@param channelSeq: 1-9 or None
@param channel: AIS channel A or B
@todo: sync names of prefix and serviceType to NMEA spec.
@see: reference the appropriate spec documents for all this stuff.
'''
rList = [prefix,serviceType,msgType,',1,1,']
if None != channelSeq: rList.append(str(channelSeq))
rList.append(',')
rList.append(channel)
rList.append(',')
payloadStr,pad = binary.bitvectoais6(aisBits) #[0]
rList.append(payloadStr)
rList.append(','+str(pad))
rStr = ''.join(rList)
rStr += '*'+checksumStr(rStr)
return rStr
'SeqID3': options.SeqID3Field,
'DestID4': options.DestID4Field,
'SeqID4': options.SeqID4Field,
}
bits = encode(msgDict)
if 'binary' == options.ioType: print str(bits)
elif 'nmeapayload' == options.ioType:
# FIX: figure out if this might be necessary at compile time
#print "bitLen",len(bits)
bitLen = len(bits)
if bitLen % 6 != 0:
bits = bits + BitVector(
size=(6 - (bitLen % 6))) # Pad out to multiple of 6
#print "result:",binary.bitvectoais6(bits)[0]
print binary.bitvectoais6(bits)[0]
# FIX: Do not emit this option for the binary message payloads. Does not make sense.
elif 'nmea' == options.ioType:
nmea = uscg.create_nmea(bits)
print nmea
else:
sys.exit('ERROR: unknown ioType. Help!')
if options.sqlCreate:
sqlCreateStr(outfile, options.fieldList, dbType=options.dbType)
if options.latexDefinitionTable:
latexDefinitionTable(outfile)
# For conversion to word tables
'RAIM': options.RAIMField,
'state_syncstate': options.state_syncstateField,
'state_slottimeout': options.state_slottimeoutField,
'state_slotoffset': options.state_slotoffsetField,
}
bits = encode(msgDict)
if 'binary'==options.ioType: print str(bits)
elif 'nmeapayload'==options.ioType:
# FIX: figure out if this might be necessary at compile time
#print "bitLen",len(bits)
bitLen=len(bits)
if bitLen%6!=0:
bits = bits + BitVector(size=(6 - (bitLen%6))) # Pad out to multiple of 6
#print "result:",binary.bitvectoais6(bits)[0]
print binary.bitvectoais6(bits)[0]
# FIX: Do not emit this option for the binary message payloads. Does not make sense.
elif 'nmea'==options.ioType:
#bitLen=len(bits)
#if bitLen%6!=0:
# bits = bits + BitVector(size=(6 - (bitLen%6))) # Pad out to multiple of 6
import aisutils.uscg as uscg
nmea = uscg.create_nmea(bits)
print nmea
#
#
#sys.exit("FIX: need to implement creating nmea capability")