digraph ft_send {
	fontname="Helvetica,Arial,sans-serif"
	node [fontname="Helvetica,Arial,sans-serif"]
	edge [fontname="Helvetica,Arial,sans-serif"]

	//layout=fdp
	//rankdir = LR

	start;
	fail [shape=doublecircle];
	done [shape=doublecircle];

	// peer offline (how)
	start -> fail [label="peer offline"]

	subgraph cluster_init {
		label="Send Init";

		style=filled;
		//color=lightgrey;


		// if it fails
		sent_init1 -> sent_init2 [label="send FT_INIT"]

		// if it fails again
		sent_init2 -> sent_init3 [label="send FT_INIT"]

	}

	start -> sent_init1 [label="send FT_INIT"]

	// peer offline (how)
	sent_init1 -> fail [label="peer offline"]

	// peer offline (how)
	sent_init2 -> fail [label="peer offline"]

	// give up after 3. attempt
	sent_init3 -> fail [label="no ack / peer offline"]

	// got an ack after an init
	sent_init1 -> have_data [label="got init_ack"]
	sent_init2 -> have_data [label="got init_ack"]
	sent_init3 -> have_data [label="got init_ack"]

	subgraph cluster_data {
		label="for each data chunk";
		style=filled;
		//node [style=filled];

		have_data -> data_awaiting_ack [label="send FT_DATA"];
		data_awaiting_ack -> data_wait_for_all [label="get FT_DATA_ACK"];
		data_awaiting_ack -> have_data [label="no FT_DATA_ACK"];

		data_wait_for_all;
	}

	// fail
	have_data -> fail [label="peer offline"]
	data_wait_for_all -> fail [label="peer offline"]

	data_wait_for_all -> done [label="all chunks acked"];
}