Have you ever wondered what all that obscure code means that flies by as stations transmit their connection requests and messages? The following link comes from one of the available software modems, which modulate and demodulate data to transmittable audio.
<RR P/F R1 > - this is a "ready to receive' (RR) packet simply acknowledging receipt of packet #0 and ready to receiver #1.
<REJ P/F R1 > - this is reject (REJ) packet meaning that the packet just received was out of sequence or a duplicate or not received accurately; ready to receive packet #1 instead.
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