The functions wrap_json_pack and wrap_json_vpack
can be used to create json object. These functions
are likely to be compatible in the format with the
packing functions of the library jansson [1].
[1] http://jansson.readthedocs.io/en/2.10/apiref.html#building-values
Change-Id: I2e251bdb9b590ba55707c5a9ed60528cad927fb3
Signed-off-by: José Bollo <jose.bollo@iot.bzh>