Echelon Neuron C - Manual (Page 134)

122 How Devices Communicate Using Application Messages
the message does not need to be authenticated. The default is FALSE
(that is, not authenticated).
service Specifies one of the following:
ACKD
(the default) - acknowledged service with retries
REQUEST – request/response protocol
UNACKD - unacknowledged service
UNACKD_RPT - repeated service (message sent multiple times)
Note: Do not use unackd or unackd_rpt in combination with
authenticated messages. Use only the ACKD or REQUEST service
type.
dest_addr An optional field in msg_out that explicitly specifies a destination
address. If dest_addr is not set, then the message is sent to the
implicit address associated with the tag, if the tag is bound. See
Explicit Addressing on page 130 for more information.
Note: To use this field, you must include the <addrdefs.h> and
<msg_addr.h> files.
Message Tags
A message tag is a connection point for application messages. Incoming
application messages are always received on a common message tag called
msg_in, but you must declare one or more message tags if
outgoing explicit
messages are used. The incoming tag and each outgoing tag or tags can be
assigned a unique network address by a network tool.
A message tag declaration can optionally include connection information. The
syntax for declaring a message tag is as follows:
msg_tag [ connection - info ] tag - identifier [, tag - identifier ...];
The connection-info field is an optional specification for connection options, in the
following form:
bind_info ( options )
The following connection options apply to message tags:
nonbind
Denotes a message tag that carries no implicit addressing
information and does not consume an address table entry. It is used
as a destination tag when creating explicitly addressed messages.
rate_est ( const-expr ) The estimated sustained message rate, in tenths of
messages per second, that the associated message tag is expected to
transmit. The allowable value range is from 0 to 18780 (0 to 1878.0
messages/second).
max_rate_est ( const-expr ) The estimated maximum message rate, in tenths of
messages per second, that the associated message tag is expected to
transmit. The allowable value range is from 0 to 18780 (0 to 1878.0
messages/second).
tag-identifier A Neuron C identifier for the message tag.