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You need a networking stack. There are some good examples out there; I remember the RadioHead library from years back. I think someone said it sucks and use this other thing instead but I can't remember what the other thing was. You'd write a driver that performs modulation with the HackRF, then use the rest of the stack to do the packetizing and retransmission and stuff.
This one is excellent, you can transmit and receive data as audio OFDM : https://github.com/romanz/amodem You will probably need to pipe it to a modulator for RF transmission.