ASN.1 Playground added CAM and DENM definitions to their default schemes. This is an easy and accessible way to determine the size of a CAM and test different payload configurations and, thus, deprecates this repo.
This parses the ASN.1 notation of a Cooperative Awareness Message (CAM) as defined in ETSI ITS-G5.
The code depends on asn1c and libtasn1.
cam_size creates a minimal CAM and outputs its size.
Change this file to create CAMs with different contents, i.e. optional items, low frequency information etc.
Please see http://www.bastibl.net/etsi-cams/ for the motivation and further information.
$ ./cam_size
CAM ::= {
header: ItsPduHeader ::= {
protocolVersion: 0
messageID: 0
stationID: 0
}
cam: CoopAwareness ::= {
generationDeltaTime: 0
camParameters: CamParameters ::= {
basicContainer: BasicContainer ::= {
stationType: 0
referencePosition: ReferencePosition ::= {
latitude: 0
longitude: 0
positionConfidenceEllipse: PosConfidenceEllipse ::= {
semiMajorConfidence: 0
semiMinorConfidence: 0
semiMajorOrientation: 0
}
altitude: Altitude ::= {
altitudeValue: 0
altitudeConfidence: 0
}
}
}
highFrequencyContainer: BasicVehicleContainerHighFrequency ::= {
heading: Heading ::= {
headingValue: 0
headingConfidence: 1
}
speed: Speed ::= {
speedValue: 0
speedConfidence: 1
}
driveDirection: 0
vehicleLength: VehicleLength ::= {
vehicleLengthValue: 1
vehicleLengthConfidenceIndication: 0
}
vehicleWidth: 1
longitudinalAcceleration: LongitudinalAcceleration ::= {
longitudinalAccelerationValue: 0
longitudinalAccelerationConfidence: 0
}
curvature: Curvature ::= {
curvatureValue: 0
curvat
5187
ureConfidence: 0
}
curvatureCalculationMode: 0
yawRate: YawRate ::= {
yawRateValue: 0
yawRateConfidence: 0
}
}
}
}
}
Total size: 327 bits 41 bytes