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# RTIG

The CERTI RunTime Infrastructure Gateway (RTIG) is a process which coordinate the HLA simulation with CERTI, there should be at least one rtig process for each federation. More...

However a single RTIG may be used for several federations. The command line usage of the RTIG is following:

rtig [-v 2]

  - -v (optional) verbosity level
    - 0 -> no output
    - 1 -> small amount
    - 2 -> show fed parse

Once the RTIG is launched an HLA Federate may interact with the RTI. In fact a federate does not talk to the RTIG directly but it uses its RTIA. RTIG is listening to RTIA connection on TCP port:

1. 60400 or,
2. the value of environment variable CERTI_TCP_PORT if it is defined

The RTIG exchange messages with the RTIA in order to satify HLA request coming from the Federate. In particular RTIG is responsible for giving to the Federate (through its RTIA) the FOM file needed to create or join the federation.