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digraph G {
rankdir=TB
labelloc=t; label="PFCP heartbeat FSM"

peer [label="PFCP CP/UP peer FSM",shape=box3d]
txrx [label="PFCP socket",shape=box]

peer -> IDLE [label="alloc()"]
IDLE -> WAIT_HEARTBEAT_RESP -> IDLE
WAIT_HEARTBEAT_RESP -> term
term [shape="octagon"]

WAIT_HEARTBEAT_RESP -> txrx [label="tx_heartbeat_req()",style=dotted]
txrx -> WAIT_HEARTBEAT_RESP [label="HEARTBEAT_EV_RX_RESP",style=dotted]

term -> peer [label="PEER_EV_HEARTBEAT_FAILURE",style=dotted]

txrx2 [label="PFCP socket",shape=box]
txrx2 -> txrx2 [label="rx Heartbeat Req\ntx Heartbeat Resp",style=dotted]

}