btstack/docs/rfcomm-channel.gv

digraph rfcomm_channel {
	// rankdir=LR;
	size="8,5"
    // orientation=landscape;
    // rotate = 90;

    CLOSED  [shape=doublecircle];
	OPEN  [shape=doublecircle];

    // DISC #x or DM

    // rfcomm_create_channel_internal
    CLOSED->W4_MULTIPLEXER [label = "create channel [multiplexer==closed]"];
    CLOSED->SEND_UIH_PN [label = "create channel [multiplexer==open]"];
    W4_MULTIPLEXER->SEND_UIH_PN [label = "multiplexere opened"];
    SEND_UIH_PN->W4_PN_RSP [label="SEND UIH PN"];
        
    // rfcomm_multiplexer_l2cap_packet_handler
    
    // rfcomm_packet_handler
    CLOSED->W4_CLIENT_AFTER_SABM  [label = "RECV SABM#x / inform client"];

    CLOSED->W4_CLIENT_AFTER_PN_CMD [label = "RECV UIH PN CMD/ inform client"];
    W4_SABM_OR_PN_CMD->W4_SABM_OR_PN_CMD [label = "RECV UIH PN CMD / SEND UIH PN RSP"];
    W4_SABM_OR_PN_CMD->SEND_UA [label ="RECV SAMB"];
    
    W4_MSC_CMD_OR_MSC_RSP-> W4_MSC_CMD [label = "RECV MSP RSP"];
    W4_MSC_RSP -> W4_CREDITS [label = "RECV MSP RSP"];
    W4_MSC_RSP -> OPEN [label = "RECV MSP RSP"];
     
    W4_CREDITS -> OPEN [label = "RECV UIH P/F credits > 0"];
        
    // rfcomm_decline_connection_internal
    W4_CLIENT_AFTER_SABM->CLOSED [label = "decline connection / SEND DM"];
    W4_CLIENT_AFTER_PN_CMD->CLOSED [label = "decline connection / SEND DM"];
    
    // rfcomm_run
    SEND_MSC_CMD_W4_MSC_CMD_OR_MSC_RSP->W4_MSC_CMD_OR_MSC_RSP [label="SEND MSC CMD"];
    SEND_MSC_RSP_W4_MSC_RSP->W4_MSC_RSP [label="SEND MSC RSP"];
    SEND_MSC_CMD_SEND_CREDITS->SEND_CREDITS [label="SEND MSC CMD"];
    SEND_CREDITS->OPEN [label="SEND CREDITS#0 && HAVE CREDITS"];
    SEND_CREDITS->W4_CREDITS [label="SEND CREDITS#0 && NO CREDITS"];
    SEND_DM->CLOSED [label="SEND DM_PF"];
    SEND_DISC->CLOSED [label="SEND DISC"];
    SEND_UA->W4_MSC_CMD [label="SEND UA"];
    SEND_PN_RSP_W4_SABM_OR_PN_CMD->W4_SABM_OR_PN_CMD[label="SEND PN RSP"];

    // rfcomm_decline_connection_internal
    W4_CLIENT_AFTER_SABM->SEND_DM[label="decline connection"];
    W4_CLIENT_AFTER_PN_CMD->SEND_DM[label="decline connection"];

    // 
    W4_CLIENT_AFTER_SABM->SEND_UA[label="accept connection"];
    W4_CLIENT_AFTER_PN_CMD->SEND_PN_RSP_W4_SABM_OR_PN_CMD[label="accept connection"];
    
    W4_PN_RSP->SEND_SABM_W4_UA [label="RECV PN RSP"];
    SEND_SABM_W4_UA->W4_UA[label="SEND SABM"];
    W4_UA->SEND_MSC_CMD_W4_MSC_CMD_OR_MSC_RSP[label="RECV UA"];
    W4_MSC_CMD_OR_MSC_RSP->SEND_MSC_RSP_W4_MSC_RSP[label="RECV MSC CMD"];
    SEND_MSC_RSP_MSC_CMD_W4_CREDITS->SEND_MSC_CMD_SEND_CREDITS [label="SEND MSP RSP"];
    W4_MSC_CMD->SEND_MSC_RSP_MSC_CMD_W4_CREDITS [label="RECV MSC CMD"];
}