digraph {
        /*
        "connected": NL_connected
        "rx": NL_rx_nameplates
        "refresh": NL_refresh_nameplates
        */
        {rank=same; NL_title NL_S0A NL_S0B}
        NL_title [label="Nameplate\nLister" style="dotted"]

        NL_S0A [label="S0A:\nnot wanting\nunconnected"]
        NL_S0B [label="S0B:\nnot wanting\nconnected" color="orange"]

        NL_S0A -> NL_S0B [label="connected"]
        NL_S0B -> NL_S0A [label="lost"]

        NL_S0A -> NL_S1A [label="refresh"]
        NL_S0B -> NL_P_tx [label="refresh" color="orange"]

        NL_S0A -> NL_P_tx [style="invis"]

        {rank=same; NL_S1A NL_P_tx NL_S1B NL_C_notify}

        NL_S1A [label="S1A:\nwant list\nunconnected"]
        NL_S1B [label="S1B:\nwant list\nconnected" color="orange"]

        NL_S1A -> NL_P_tx [label="connected"]
        NL_P_tx [shape="box" label="C.tx_list()" color="orange"]
        NL_P_tx -> NL_S1B [color="orange"]
        NL_S1B -> NL_S1A [label="lost"]

        NL_S1A -> foo [label="refresh"]
        foo [label="" style="dashed"]
        foo -> NL_S1A

        NL_S1B -> foo2 [label="refresh"]
        foo2 [label="" style="dashed"]
        foo2 -> NL_P_tx

        NL_S0B -> NL_C_notify [label="rx"]
        NL_S1B -> NL_C_notify [label="rx"]
        NL_C_notify [shape="box" label="W.got_nameplates()"]
        NL_C_notify -> NL_S0B

        {rank=same; foo foo2 legend}
        legend [shape="box" style="dotted"
                label="connected: NL_connected()\nlost: NL_lost()\nrefresh: NL_refresh_nameplates()\nrx: NL_rx_nameplates()"]
}