The ParameterMQServer device sends out parameter objects (serialized with TMessage) for incoming requests (parameter name & run ID). The communication is via REQ-REP pattern.

The device executable has to be started with the following command line parameters:

--id <device id> device id (has to match one in the json file).
--mq-config <path/to/device-config> location of the transport config file.
--first-input-name location of the first input file for the FairRuntimeDb.

Optional options are:

--first-input-type arg (="ROOT") first input file type (ROOT/ASCII).
--second-input-name arg (="") location of the second input file.
--second-input-type arg (="ROOT") second input file type (ROOT/ASCII).
--output-name arg (="") location of the output file.
--output-type arg (="ROOT") output file type (ROOT).
--channel-name arg (="data") output channel name.

When both inputs are provided, and a parameter exists in both, first input will be taken.

For further documentation of parameter system check parameter section in FairRoot webpage.

The request for parameters is a string in this form: "ParameterName,RunID".

For an example client device that retrieves the parameters from the ParameterMQServer, take a look at ../examples/MQ/7-parameters/.