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1. The default behaviour for bufr_compare without any option is to perform a bit by bit comparison of the two messages. If the messages are found to be bitwise different then bufr_compare switches to a "key based" mode to find out which coded keys are different. To see how bufr_compare works we first set the key bufrHeaderSubCentre=1 in the file syno_1.bufr

   Code Block
   > bufr_set -s bufrHeaderSubCentre=1 data/bufr/syno_1.bufr out.bufr

   Then we can compare the two fields with bufr_compare.

   Code Block
   > bufr_compare data/bufr/syno_1.bufr out.bufr == 1 == DIFFERENCE == long [bufrHeaderSubCentre]: [0] != [1]

   In the output we can see that the only "coded" key with different values in the two messages is bufrHeaderSubCentre . The comparison can be forced to be successful by listing the keys with different values in the -b option.

   Code Block
   > bufr_compare -b bufrHeaderSubCentre data/bufr/syno_1.bufr out.bufr