[Discuss-gnuradio] demodulate a CPFSK modulated file - how to

[Arturo Rinaldi]

i'm trying to demodulate a cpfsk modulation implemented through the block

gr.cpfsk_bc( )

my scheme is :

bytes_source (a byte vector_source with one byte of stuffing inserted as first element of the vector)
gr.packed_to_unpacked_bb(1,  gr.GR_MSB_FIRST )
gr.cpfsk_bc(10,1,200)
file_sink (complex type)

then after different un-succeeded attempts to demodulate the modulated file through the quadrature demodulator and converting the float output to byte i was wondering a different approach to demodulate the file by using the block

gr.constellation_decoder_bc( )

and then removing the stuffing byte to obtain the original file. My question so is which are , if possible,  the parameters to pass to the constellation decoder in order to demodulate the CPFSK.

thx in advance

    Arturo