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RMR Configuration and Delpoyment 
============================================================================================ 
 
The RIC Message Router (RMR) is a library which applications 
use to send and receive messages where the message routing, 
endpoint selection, is based on the message type rather than 
on traditional DNS names or IP addresses. This document 
contains information regarding the configuration of RMR when 
it is embedded by a *user application* . RMR itself is not a 
deployable entity. 
 
Configuration 
-------------------------------------------------------------------------------------------- 
 
Several aspects of RMR behaviour is controlled via 
environment variables which are set at the time that a user 
application invokes the RMR initialisation function. This 
allows these variables to be set before the application is 
started as a function of the true environment, or set by the 
application as a means for the application to influence RMR's 
behaviour. The following is a list of RMR variables which RMR 
recognises (see the main RMR manual page in the development 
package for more details). 
 
 
RMR_ASYNC_CONN 
   
  Allows the async connection mode to be turned off (by 
  setting the value to 0. When set to 1, or missing from the 
  environment, RMR will invoke the connection interface in 
  the transport mechanism using the non-blocking (async) 
  mode. This will likely result in many "soft failures" 
  (retry) until the connection is established, but allows 
  the application to continue unimpeeded should the 
  connection be slow to set up. 
   
 
RMR_BIND_IF 
   
  This provides the interface that RMR will bind listen 
  ports to allowing for a single interface to be used rather 
  than listening across all interfaces. This should be the 
  IP address assigned to the interface that RMR should 
  listen on, and if not defined RMR will listen on all 
  interfaces. 
   
 
RMR_CTL_PORT 
   
  This variable defines the port that RMR should open for 
  communications with Route Manager, and other RMR control 
  applications. If not defined, the port 4561 is assumed. 
   
  Previously, the RMR_RTG_SVC (route table generator service 
  port) was used to define this port. However, a future 
  version of Route Manager will require RMR to connect and 
  request tables, thus that variable is now used to supply 
  the Route Manager well known address and port. 
   
  To maintain backwards compatablibility with the older 
  Route Manager versions, the presence of this variable in 
  the environment will shift RMR's behaviour with respect to 
  the default value used when RMR_RTG_SVC is **not** 
  defined. 
   
  When RMR_CTL_PORT is **defined:** RMR assumes that Route 
  Manager requires RMR to connect and request table updates 
  is made, and the default well known address for Route 
  manager is used (routemgr:4561). 
   
  When RMR_CTL_PORT is **undefined:** RMR assumes that Route 
  Manager will connect and push table updates, thus the 
  default listen port (4561) is used. 
   
  To avoid any possible misinterpretation and/or incorrect 
  assumptions on the part of RMR, it is recommended that 
  both the RMR_CTL_PORT and RMR_RTG_SVC be defined. In the 
  case where both variables are defined, RMR will behave 
  exactly as is communicated with the variable's values. 
   
 
RMR_RTG_SVC 
   
  The value of this variable depends on the Route Manager in 
  use. 
   
  When the Route Manager is expecting to connect to an xAPP 
  and push route tables, this variable must indicate the 
  port which RMR should use to listen for these connections. 
   
  When the Route Manager is expecting RMR to connect and 
  request a table update during initialisation, the variable 
  should be the host of the Route Manager process. 
   
  The RMR_CTL_PORT variable (added with the support of 
  sending table update requests to Route manager), controls 
  the behaviour if this variable is not set. See the 
  description of that variable for details. 
   
 
RMR_HR_LOG 
   
  By default RMR writes messages to standard error 
  (incorrectly referred to as log messages) in human 
  readable format. If this environment variable is set to 0, 
  the format of standard error messages might be written in 
  some format not easily read by humans. If missing, a value 
  of 1 is assumed. 
   
 
RMR_LOG_VLEVEL 
   
  This is a numeric value which corresponds to the verbosity 
  level used to limit messages written to standard error. 
  The lower the number the less chatty RMR functions are 
  during execution. The following is the current 
  relationship between the value set on this variable and 
  the messages written: 
   
 
0 
   
  Off; no messages of any sort are written. 
   
 
1 
   
  Only critical messages are written (default if this 
  variable does not exist) 
   
 
2 
   
  Errors and all messages written with a lower value. 
   
 
3 
   
  Warnings and all messages written with a lower value. 
   
 
4 
   
  Informational and all messages written with a lower 
  value. 
   
 
5 
   
  Debugging mode -- all messages written, however this 
  requires RMR to have been compiled with debugging 
  support enabled. 
 
 
 
RMR_RTG_ISRAW 
   
  **Deprecated.** Should be set to 1 if the route table 
  generator is sending "plain" messages (not using RMR to 
  send messages, 0 if the rtg is using RMR to send. The 
  default is 1 as we don't expect the rtg to use RMR. 
   
  This variable is only recognised when using the NNG 
  transport library as it is not possible to support NNG 
  "raw" communications with other transport libraries. It is 
  also necessary to match the value of this variable with 
  the capabilities of the Route Manager; at some point in 
  the future RMR will assume that all Route Manager messages 
  will arrive via an RMR connection and will ignore this 
  variable. 
 
RMR_SEED_RT 
   
  This is used to supply a static route table which can be 
  used for debugging, testing, or if no route table 
  generator process is being used to supply the route table. 
  If not defined, no static table is used and RMR will not 
  report *ready* until a table is received. The static route 
  table may contain both the route table (between newrt 
  start and end records), and the MEID map (between meid_map 
  start and end records) 
 
RMR_SRC_ID 
   
  This is either the name or IP address which is placed into 
  outbound messages as the message source. This will used 
  when an RMR based application uses the rmr_rts_msg() 
  function to return a response to the sender. If not 
  supplied RMR will use the hostname which in some container 
  environments might not be routable. 
   
  The value of this variable is also used for Route Manager 
  messages which are sent via an RMR connection. 
 
RMR_VCTL_FILE 
   
  This supplies the name of a verbosity control file. The 
  core RMR functions do not produce messages unless there is 
  a critical failure. However, the route table collection 
  thread, not a part of the main message processing 
  component, can write additional messages to standard 
  error. If this variable is set, RMR will extract the 
  verbosity level for these messages (0 is silent) from the 
  first line of the file. Changes to the file are detected 
  and thus the level can be changed dynamically, however RMR 
  will only suss out this variable during initialisation, so 
  it is impossible to enable verbosity after startup. 
 
RMR_WARNINGS 
   
  If set to 1, RMR will write some warnings which are 
  non-performance impacting. If the variable is not defined, 
  or set to 0, RMR will not write these additional warnings.