#257 TTI: register for ComID100 PD to both valid multicast addresses

[Matthias Mossner]

IEC16375-2-3 defines two possible multicast addresses for grpAll.aVeh.lCst.lClTrn.lTrn depending on the train network "configuration" (only one CN connected to ETB gateway or more). In TTI implementation of TCN-Open stack ComId 100 is configured to listen to 239.255.0.0 which is the case when there is only one CN, but for some projects which have more than one CN connected to ETB gateway we need TTI ComId100 (also) to listen to multicast address 239.194.0.0 which is used generally and especially when there are more consist networks.
Therefore TTI shall register ComID 100 (PD) to listen to both addresses or to be able to configure to which address it shall be listened to.
I made an example implementation where ComID 100 is registered to listen to both addresses (here the change of Ticket #256 - revision r1865 is needed).

[Matthias Mossner]

please see revision r1866 on branch trdp-mm-1.3.1.0 for a possible implementation

[Bernd Löhr]

Ticket #256 refers to MD, but ComId 100 is PD! PD issue has been addressed in Ticket #230. Actually, an additional subscription on 239.194.0.0 should work.

[Bernd Löhr]

ComId 101 needs to be listened to both MCs as well.

[Matthias Mossner]

Yes, you are right of course! I'm going to add that! And you are also right with the duplication to ticket #230! Though my intention was to be more minimalistic and change it only for multicast cause this was the only scenario which came in my mind to that more than one queue entry is really needed! Therefore I asked Stefan Bender if he has another UseCase - just to know other valid scenarios. Nevertheless I will change my code accordingly!