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Technical Support
On-Line Manuals
RL-ARM User's Guide (MDK v4)
RL-RTX
RL-FlashFS
RL-TCPnet
TCP Socket
Opening TCP Connection
TCP Active Open
TCP Passive Open
Sending TCP Data
Example for Sending Data
Multiple TCP Connections
UDP Socket
Opening UDP Connection
Sending UDP Data
When DHCP Enabled
When ARP Cache Empty
Example for Sending Data
IP Multicasting
Multiple UDP Connections
Configuring RL-TCPnet
Static Configuration
System Definitions
Ethernet Network Interface
PPP Network Interface
SLIP Network Interface
UDP Socket
TCP Socket
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Localhost
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FCARM File Converter
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Debugging
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Function Overview
BSD Routines
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RL-CAN
RL-USB
Example Programs
Library Reference
Appendix
IP Multicasting
IP multicasting is the transmission of an IP datagram to a "host group", a set of zero or more hosts identified by a single IP destination address. A multicast datagram is delivered to all the members of its destination host group in the same way as regular unicast datagrams.
A host can receive a multicast datagram when it is a member of a host group a datagram is destined to. To enable reception of multicast packets a host must first join a host group.
A membership of a host group is dynamic. Hosts may join and leave groups at any time.
Host groups are identified by class D IP adresses, those with "1110" as their high-order four bits. Host group addresses range from 224.0.0.0 to 239.255.255.255. The address 224.0.0.0 is reserved and shall not be assigned to any group and 224.0.0.1 is assigned to the permanent group of all IP hosts, including gateways. This group shall also not be used for a dynamic host group.
UDP multicasting
Incoming multicast UDP datagrams are received by UDP socket in the same way as normal, unicast datagrams. The only difference is that the host must first join a host group, before the muticast packets for the selected group can be received.
Outgoing multicast UDP datagrams are sent in the same way as unicast datagrams, only the destination IP address is a group address instead of a host address.
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