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Receive, demodulate and save to file

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I'm trying to receive a RF signal at 868.85 Mhz, demod it, and save the data to a file.

The device sending the signal is a wireless keyboard that connects to a remote display. The keyboard has a Telit LE50 868 transceiver which uses GFSK modulation.
The keyboard send out data at a specific interval when no key is pressed, and also when a key is pressed. I'm pretty sure it sends out the complete display information and not only which key is pressed.
The signal is very short but I am able to detect it using an Airspy mini and SDR#.
As far as I know it should be possible to accomplish what I need with GNU Radio Companion, but I can't seem to figure out how.

Who can help me please ?

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