Hi
TDMA is itself a broadcast protocl, is there any function that allows multiple station applications to receive the packet sent by the transmitting station i.e. transfering the packet to its upper layers?
To clarify: TDMA is not part of the payload transportation process, it just manages when a normal UDP/IP or a raw Ethernet packet can be exchanged - as unicast or broadcast.
How would it be done if i would like to send a packet to all nodes on the RTnet network? My understanding is currently, i would need to wait till the succeeding cycles?
If you want to transmit a packet from one node to all others and there is only a single application listening on the destination protocol/port, you can do it the standard way: create a raw Ethernet packet with broadcast destination address or a UDP/IP packet with a broadcast IP. And current TDMA will allow you to send one of such packets per station per cycle, thus when every station does it, all will receive a packet from eachother in a single cycle.
What you cannot do, due to the real-time optimised design of RTnet, is to listen with several applications on a single destination port or raw Ethernet protocol. RTnet implements a strict buffer budgeting for incoming and outgoing packets. This budgeting works fine by exchanging a full with an empty buffer between the owners, it will become much more complicated (and slower) with multiple receivers of a single data buffer. This is also one reason why multicasting is not yet implemented - it typically also requires a shared reception of messages on the same host.
Jan
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