10 10 10 Community

Hi,
I’ve been trying to use the subscription ”SUB_RECEIVED_CAM_INFO”, but I keep getting this error message:

STEP 4 – SETUP PHASE
Error: Invalid argument: Storage::readChar(): invalid position
iCS –> #Error while receiving response from Application: tcpip::Socket::receive() @ recv: Success

I added some similar code to Server::LookForNewSubscriptions:

bool
Server::LookForNewSubscriptions() {
int timestep = myInputStorage.readInt();
int nodeId = myInputStorage.readInt();

// create reply message
writeStatusCmd(CMD_ASK_FOR_SUBSCRIPTION, APP_RTYPE_OK, ””);

if (!ApplicationLogic::m_camAreaIsSet) {
Area area = ApplicationLogic::GetCamArea();
SubsSetCamArea(myOutputStorage, nodeId, timestep, area);
} else if (!ApplicationLogic::m_returnCarAreaIsSet) {
Area area = ApplicationLogic::GetReturningCarArea();
SubsReturnCarsInZone(myOutputStorage, nodeId, timestep, area);
} else if (!ApplicationLogic::m_returnCamMessagesInfoIsSet) {
bool flag = ApplicationLogic::SetCamInfoFlagToTrue();
SubsReceivedCamInfo(myOutputStorage, nodeId, timestep);
} else if (ApplicationLogic::m_camAreaIsSet && ApplicationLogic::m_returnCarAreaIsSet && ApplicationLogic::m_returnCamMessagesInfoIsSet) {
StopAskingForSubscription(myOutputStorage, nodeId, timestep);
}

return true;
}

and here’s the function that forms the second primitive of the reply:

bool
Server::SubsReceivedCamInfo(Storage& myOutputStorage, int nodeId, int timestep) {
// command length
myOutputStorage.writeUnsignedByte(1 + 1 + 1);
// command type
myOutputStorage.writeUnsignedByte(CMD_ASK_FOR_SUBSCRIPTION);
// subscription type
myOutputStorage.writeUnsignedByte(SUB_RECEIVED_CAM_INFO);

return true;
}

I can’t see where I went wrong.. I even checked how iCS receives this primitive, and it was just three unsigned bytes.

please help me,

Kind Regards,
Muhammad

Hi,
we are currently studying the patch for the ns-3 simulator, on the one hand to get a better understanding of the system as a whole, but also because we would like to run some simulations using the patched ns-3 separately, i.e. just the C2C protocol stack. Unfortunately, it`s not easy to get an idea of how the protocol stack works, there are some examples anyway, but e.g. the doxygen documentation is far from being complete. So i wanted to ask if maybe there`s some additional documentation available ? Thanks in advance,

Best regards,
Manfred