In order to encode RO data into BUFR, there needs to be a mapping between the satellite character code (usually a 4-chr string) in the UCAR or ROPP netCDF or dsc/dat GFZ files, and the numeric Satellite Identifier code in BUFR (and reverse on decode). The character code is also used when there is a need to process different satellites in different ways (e.g. in the ROPP pre-processor).

WMO have recently approved the BUFR codes for the COSMIC-2 constellation as follows:

From: Jeff Ator - NOAA Federal [mailto:jeff.ator@noaa.gov] 
Sent: 26 January 2015 14:40
To: dhunt@ucar.edu
Cc: Offiler, Dave; ector@ucar.edu; schrein@ucar.edu; William Kuo;
Lidia Cucurull - NOAA Affiliate; Bradley Mabe - NOAA Federal;
Shucai Guan - NOAA Federal
Subject: Re: Fwd: BUFR sat id code for COSMIC-2

Hi Everyone,

Just to close the loop on this, the following is what was approved
by the codes team during the December review period:

750  COSMIC-2 E1
751  COSMIC-2 E2
752  COSMIC-2 E3
753  COSMIC-2 E4
754  COSMIC-2 E5
755  COSMIC-2 E6

724  COSMIC-2 P1
725  COSMIC-2 P2
726  COSMIC-2 P3
727  COSMIC-2 P4
728  COSMIC-2 P5
729  COSMIC-2 P6
As you can surmise, "E" means equatorial and "P" means polar.
These new entries will get published in Common Code Table C-5 
in the next table update in early May.
-Jeff

In addition, UCAR confirm the character codes that they will included in their netCDF files:

From: Doug Hunt
Re: Fwd: BUFR sat id code for COSMIC-2	
Sent: Mon 26/01/2015 17:41
To: Offiler, Dave

Hi Dave:  You read my mind!  COSMIC-2 equatorial will be named

C2E1-6

We haven't got round to putting in the code for COSMIC-2 polar yet,
but I'm sure it will be C2P1-6 as well.

Take care,
   Doug

Hence the mappings:

Constellation  Orbit          netCDF          BUFR
-----------------------------------------------------
COSMIC-2 E1-6  Equatorial  'C2E1-C2E6' <--> 750-755
COSMIC-2 P1-6  Polar       'C2P1-C2P6' <--> 724-729

need to be included in ropp_io/bufr as new array entries in: (a) namelist file roppbufrcodes.nl (b) source code file convertcodes.f90 recalling that (a) has precedence over (b) which is a fall-back default list, so that should COSMIC-2 support be needed for ROPP-8, only a new namelist file need be given to users.