The multicast address and port used for incoming and outgoing multicast immediate messages can be set with mim_address (context) and mim_destination_port (context) options.

Attention: MIM reception is disabled by default. If you want an application to be able to receive MIM messages, you must set the configuration option mim_address (context) to the desired multicast group address.

A context may use different multicast addresses and/or ports for incoming and outgoing messages by setting one or more of:

In case of conflict, the most recently set option wins.

As with LBT-RM on multi-homed hosts, the interface UM uses for MIM follows the interface used with multicast topic resolution. See resolver_multicast_interface (context).

Warning: The addresses and ports you configure for MIM traffic should not overlap with any addresses or ports - or address and port ranges - configured for LBT-RM transports or Topic Resolution traffic. For example, do not use the same multicast address for both Topic Resolution (resolver_multicast_address (context)) and MIM (mim_address (context)). Use different addresses and ports for all multicast address options and port options.

See also Multicast Immediate Messaging for general information on MIM.

Reference <-

mim_address (context) <-

: Convenience option to set both the incoming and outgoing multicast addresses for multicast immediate messages.

: See mim_outgoing_address (context) and mim_incoming_address (context) for their respective default values. See Multicast Immediate Messaging for general information about MIM.

Scope:	context
Type:	struct in_addr
Default value:	n.a.
When to Set:	Can only be set during object initialization.

mim_destination_port (context) <-

: The UDP destination port that multicast immediate messages are sent to and received from.

: See Port Assignments for more information about configuring ports. See Multicast Immediate Messaging for general information about MIM.

Scope:	context
Type:	lbm_uint16_t
Default value:	14401
Byte order:	Network
When to Set:	Can only be set during object initialization.

mim_incoming_address (context) <-

: The IP multicast address (or domain name of the multicast address) that multicast immediate messages are received from.

: IMPORTANT: The default value 0.0.0.0 disables reception of multicast immediate messages. See Multicast Immediate Messaging for general information about MIM.

Scope:	context
Type:	struct in_addr
Default value:	0.0.0.0
When to Set:	Can only be set during object initialization.

mim_incoming_destination_port (context) <-

: The UDP destination port that multicast immediate messages are received from.

: See Port Assignments for more information about configuring ports. See Multicast Immediate Messaging for general information about MIM.

Scope:	context
Type:	lbm_uint16_t
Default value:	14401
Byte order:	Network
When to Set:	Can only be set during object initialization.

mim_outgoing_address (context) <-

: The IP multicast address (or domain name of the multicast address) that multicast immediate messages are sent to.

: See Multicast Immediate Messaging for general information about MIM.

Scope:	context
Type:	struct in_addr
Default value:	224.10.10.21
When to Set:	Can only be set during object initialization.

mim_outgoing_destination_port (context) <-

: The UDP destination port that multicast immediate messages are sent to.

: See Port Assignments for more information about configuring ports. See Multicast Immediate Messaging for general information about MIM.

Scope:	context
Type:	lbm_uint16_t
Default value:	14401
Byte order:	Network
When to Set:	Can only be set during object initialization.