reconnect.at

AT_BANNER([reconnect library])

m4_define([__RECONNECT_CHECK],
  [AT_SETUP([$1])
   $2
   AT_KEYWORDS([reconnect])
   AT_DATA([input], [$3])
   AT_CHECK([$4], [0], [$5])
   AT_CLEANUP])

m4_define([RECONNECT_CHECK],
  [__RECONNECT_CHECK(
     [$1 - C],
     [],
     [$2],
     [ovstest test-reconnect < input],
     [$3])
   __RECONNECT_CHECK(
     [$1 - Python],
     [AT_SKIP_IF([test $HAVE_PYTHON = no])],
     [$2],
     [$PYTHON $srcdir/test-reconnect.py < input],
     [$3])])

######################################################################
RECONNECT_CHECK([nothing happens if not enabled],
  [run
timeout
],
  [### t=1000 ###
run
timeout
  no timeout
])

######################################################################
RECONNECT_CHECK([quick connect, idle disconnect],
  [enable

# Connection succeeds.
run
connected

# Send inactivity probe.
timeout
run

# Idle timeout kills connection.
timeout
run
disconnected
],
  [### t=1000 ###
enable
  in BACKOFF for 0 ms (0 ms backoff)

# Connection succeeds.
run
  should connect
connected
  in ACTIVE for 0 ms (0 ms backoff)
  created 1000, last activity 1000, last connected 1000
  1 successful connections out of 1 attempts, seqno 1
  connected
  last connected 0 ms ago, connected 0 ms total

# Send inactivity probe.
timeout
  advance 5000 ms

### t=6000 ###
  in ACTIVE for 5000 ms (0 ms backoff)
run
  should send probe
  in IDLE for 0 ms (0 ms backoff)

# Idle timeout kills connection.
timeout
  advance 5000 ms

### t=11000 ###
  in IDLE for 5000 ms (0 ms backoff)
run
  should disconnect
disconnected
  in BACKOFF for 0 ms (1000 ms backoff)
  1 successful connections out of 1 attempts, seqno 2
  disconnected
  disconnected at 11000 ms (0 ms ago)
])

######################################################################
RECONNECT_CHECK([slow connect, idle disconnect],
  [enable

# Start connecting.
run
connecting

# Connect after 500 ms.
advance 500
run
connected

# Send inactivity probe.
timeout
run

# Idle timeout kills connection.
timeout
run
disconnected
],
  [### t=1000 ###
enable
  in BACKOFF for 0 ms (0 ms backoff)

# Start connecting.
run
  should connect
connecting
  in CONNECTING for 0 ms (0 ms backoff)

# Connect after 500 ms.
advance 500

### t=1500 ###
  in CONNECTING for 500 ms (0 ms backoff)
run
connected
  in ACTIVE for 0 ms (0 ms backoff)
  created 1000, last activity 1000, last connected 1500
  1 successful connections out of 1 attempts, seqno 1
  connected
  last connected 0 ms ago, connected 0 ms total

# Send inactivity probe.
timeout
  advance 5000 ms

### t=6500 ###
  in ACTIVE for 5000 ms (0 ms backoff)
run
  should send probe
  in IDLE for 0 ms (0 ms backoff)

# Idle timeout kills connection.
timeout
  advance 5000 ms

### t=11500 ###
  in IDLE for 5000 ms (0 ms backoff)
run
  should disconnect
disconnected
  in BACKOFF for 0 ms (1000 ms backoff)
  1 successful connections out of 1 attempts, seqno 2
  disconnected
  disconnected at 11500 ms (0 ms ago)
])

######################################################################
RECONNECT_CHECK([connect backs off],
  [enable

# First connection attempt fails after 1000 ms.
run
connecting
run
timeout
run
connect-failed

# Back off for 1000 ms.
timeout
run

# Second connection attempt fails after 1000 ms.
connecting
timeout
run
connect-failed

# Back off for 2000 ms.
timeout
run

# Third connection attempt fails after 2000 ms.
connecting
timeout
run
connect-failed

# Back off for 4000 ms.
timeout
run

# Third connection attempt fails after 4000 ms.
connecting
timeout
run
connect-failed

# Back off for 8000 ms.
timeout
run

# Third connection attempt fails after 8000 ms.
connecting
timeout
run
connect-failed

# Back off for 8000 ms.
timeout
run

# Fourth connection attempt fails after 8000 ms.
connecting
timeout
run
connect-failed
],
  [### t=1000 ###
enable
  in BACKOFF for 0 ms (0 ms backoff)

# First connection attempt fails after 1000 ms.
run
  should connect
connecting
  in CONNECTING for 0 ms (0 ms backoff)
run
timeout
  advance 1000 ms

### t=2000 ###
  in CONNECTING for 1000 ms (0 ms backoff)
run
  should disconnect
connect-failed
  in BACKOFF for 0 ms (1000 ms backoff)
  0 successful connections out of 1 attempts, seqno 0

# Back off for 1000 ms.
timeout
  advance 1000 ms

### t=3000 ###
  in BACKOFF for 1000 ms (1000 ms backoff)
run
  should connect

# Second connection attempt fails after 1000 ms.
connecting
  in CONNECTING for 0 ms (1000 ms backoff)
timeout
  advance 1000 ms

### t=4000 ###
  in CONNECTING for 1000 ms (1000 ms backoff)
run
  should disconnect
connect-failed
  in BACKOFF for 0 ms (2000 ms backoff)
  0 successful connections out of 2 attempts, seqno 0

# Back off for 2000 ms.
timeout
  advance 2000 ms

### t=6000 ###
  in BACKOFF for 2000 ms (2000 ms backoff)
run
  should connect

# Third connection attempt fails after 2000 ms.
connecting
  in CONNECTING for 0 ms (2000 ms backoff)
timeout
  advance 2000 ms

### t=8000 ###
  in CONNECTING for 2000 ms (2000 ms backoff)
run
  should disconnect
connect-failed
  in BACKOFF for 0 ms (4000 ms backoff)
  0 successful connections out of 3 attempts, seqno 0

# Back off for 4000 ms.
timeout
  advance 4000 ms

### t=12000 ###
  in BACKOFF for 4000 ms (4000 ms backoff)
run
  should connect

# Third connection attempt fails after 4000 ms.
connecting
  in CONNECTING for 0 ms (4000 ms backoff)
timeout
  advance 4000 ms

### t=16000 ###
  in CONNECTING for 4000 ms (4000 ms backoff)
run
  should disconnect
connect-failed
  in BACKOFF for 0 ms (8000 ms backoff)
  0 successful connections out of 4 attempts, seqno 0

# Back off for 8000 ms.
timeout
  advance 8000 ms

### t=24000 ###
  in BACKOFF for 8000 ms (8000 ms backoff)
run
  should connect

# Third connection attempt fails after 8000 ms.
connecting
  in CONNECTING for 0 ms (8000 ms backoff)
timeout
  advance 8000 ms

### t=32000 ###
  in CONNECTING for 8000 ms (8000 ms backoff)
run
  should disconnect
connect-failed
  in BACKOFF for 0 ms (8000 ms backoff)
  0 successful connections out of 5 attempts, seqno 0

# Back off for 8000 ms.
timeout
  advance 8000 ms

### t=40000 ###
  in BACKOFF for 8000 ms (8000 ms backoff)
run
  should connect

# Fourth connection attempt fails after 8000 ms.
connecting
  in CONNECTING for 0 ms (8000 ms backoff)
timeout
  advance 8000 ms

### t=48000 ###
  in CONNECTING for 8000 ms (8000 ms backoff)
run
  should disconnect
connect-failed
  in BACKOFF for 0 ms (8000 ms backoff)
  0 successful connections out of 6 attempts, seqno 0
])

######################################################################
RECONNECT_CHECK([connections with no data preserve backoff],
  [enable

# First connect, then idle timeout kills connection.
run
connected
timeout
run
timeout
run
disconnected

# Back off for 1000 ms.
timeout
run

# Second connect, then idle timeout kills connection.
run
connected
timeout
run
timeout
run
disconnected

# Back off for 2000 ms.
timeout
run

# Third connect, then idle timeout kills connection.
run
connected
timeout
run
timeout
run
disconnected

# Back off for 4000 ms.
timeout
], [### t=1000 ###
enable
  in BACKOFF for 0 ms (0 ms backoff)

# First connect, then idle timeout kills connection.
run
  should connect
connected
  in ACTIVE for 0 ms (0 ms backoff)
  created 1000, last activity 1000, last connected 1000
  1 successful connections out of 1 attempts, seqno 1
  connected
  last connected 0 ms ago, connected 0 ms total
timeout
  advance 5000 ms

### t=6000 ###
  in ACTIVE for 5000 ms (0 ms backoff)
run
  should send probe
  in IDLE for 0 ms (0 ms backoff)
timeout
  advance 5000 ms

### t=11000 ###
  in IDLE for 5000 ms (0 ms backoff)
run
  should disconnect
disconnected
  in BACKOFF for 0 ms (1000 ms backoff)
  1 successful connections out of 1 attempts, seqno 2
  disconnected
  disconnected at 11000 ms (0 ms ago)

# Back off for 1000 ms.
timeout
  advance 1000 ms

### t=12000 ###
  in BACKOFF for 1000 ms (1000 ms backoff)
  last connected 11000 ms ago, connected 10000 ms total
run
  should connect

# Second connect, then idle timeout kills connection.
run
  should connect
connected
  in ACTIVE for 0 ms (1000 ms backoff)
  created 1000, last activity 1000, last connected 12000
  2 successful connections out of 2 attempts, seqno 3
  connected
  last connected 0 ms ago, connected 10000 ms total
timeout
  advance 5000 ms

### t=17000 ###
  in ACTIVE for 5000 ms (1000 ms backoff)
run
  should send probe
  in IDLE for 0 ms (1000 ms backoff)
timeout
  advance 5000 ms

### t=22000 ###
  in IDLE for 5000 ms (1000 ms backoff)
run
  should disconnect
disconnected
  in BACKOFF for 0 ms (2000 ms backoff)
  2 successful connections out of 2 attempts, seqno 4
  disconnected
  disconnected at 22000 ms (0 ms ago)

# Back off for 2000 ms.
timeout
  advance 2000 ms

### t=24000 ###
  in BACKOFF for 2000 ms (2000 ms backoff)
  last connected 12000 ms ago, connected 20000 ms total
run
  should connect

# Third connect, then idle timeout kills connection.
run
  should connect
connected
  in ACTIVE for 0 ms (2000 ms backoff)
  created 1000, last activity 1000, last connected 24000
  3 successful connections out of 3 attempts, seqno 5
  connected
  last connected 0 ms ago, connected 20000 ms total
timeout
  advance 5000 ms

### t=29000 ###
  in ACTIVE for 5000 ms (2000 ms backoff)
run
  should send probe
  in IDLE for 0 ms (2000 ms backoff)
timeout
  advance 5000 ms

### t=34000 ###
  in IDLE for 5000 ms (2000 ms backoff)
run
  should disconnect
disconnected
  in BACKOFF for 0 ms (4000 ms backoff)
  3 successful connections out of 3 attempts, seqno 6
  disconnected
  disconnected at 34000 ms (0 ms ago)

# Back off for 4000 ms.
timeout
  advance 4000 ms

### t=38000 ###
  in BACKOFF for 4000 ms (4000 ms backoff)
  last connected 14000 ms ago, connected 30000 ms total
])

######################################################################
RECONNECT_CHECK([brief connection preserves backoff],
  [enable

# First connection attempt fails after 1000 ms.
run
connecting
run
timeout
run
connect-failed

# Back off for 1000 ms.
timeout
run

# Second connection attempt fails after 1000 ms.
connecting
timeout
run
connect-failed

# Back off for 2000 ms.
timeout
run

# Third connection attempt succeeds after 500 ms.
connecting
advance 500
run
connected

# Connection drops after another 250 ms.
advance 250
disconnected
run

# Back off for 4000 ms.
timeout
run
], [### t=1000 ###
enable
  in BACKOFF for 0 ms (0 ms backoff)

# First connection attempt fails after 1000 ms.
run
  should connect
connecting
  in CONNECTING for 0 ms (0 ms backoff)
run
timeout
  advance 1000 ms

### t=2000 ###
  in CONNECTING for 1000 ms (0 ms backoff)
run
  should disconnect
connect-failed
  in BACKOFF for 0 ms (1000 ms backoff)
  0 successful connections out of 1 attempts, seqno 0

# Back off for 1000 ms.
timeout
  advance 1000 ms

### t=3000 ###
  in BACKOFF for 1000 ms (1000 ms backoff)
run
  should connect

# Second connection attempt fails after 1000 ms.
connecting
  in CONNECTING for 0 ms (1000 ms backoff)
timeout
  advance 1000 ms

### t=4000 ###
  in CONNECTING for 1000 ms (1000 ms backoff)
run
  should disconnect
connect-failed
  in BACKOFF for 0 ms (2000 ms backoff)
  0 successful connections out of 2 attempts, seqno 0

# Back off for 2000 ms.
timeout
  advance 2000 ms

### t=6000 ###
  in BACKOFF for 2000 ms (2000 ms backoff)
run
  should connect

# Third connection attempt succeeds after 500 ms.
connecting
  in CONNECTING for 0 ms (2000 ms backoff)
advance 500

### t=6500 ###
  in CONNECTING for 500 ms (2000 ms backoff)
run
connected
  in ACTIVE for 0 ms (2000 ms backoff)
  created 1000, last activity 1000, last connected 6500
  1 successful connections out of 3 attempts, seqno 1
  connected
  last connected 0 ms ago, connected 0 ms total

# Connection drops after another 250 ms.
advance 250

### t=6750 ###
  in ACTIVE for 250 ms (2000 ms backoff)
disconnected
  in BACKOFF for 0 ms (4000 ms backoff)
  1 successful connections out of 3 attempts, seqno 2
  disconnected
  disconnected at 6750 ms (0 ms ago)
run

# Back off for 4000 ms.
timeout
  advance 4000 ms

### t=10750 ###
  in BACKOFF for 4000 ms (4000 ms backoff)
  last connected 4250 ms ago, connected 250 ms total
run
  should connect
])

######################################################################
RECONNECT_CHECK([brief connection with data preserves backoff],
  [enable

# First connection attempt fails after 1000 ms.
run
connecting
run
timeout
run
connect-failed

# Back off for 1000 ms.
timeout
run

# Second connection attempt fails after 1000 ms.
connecting
timeout
run
connect-failed

# Back off for 2000 ms.
timeout
run

# Third connection attempt succeeds after 500 ms.
connecting
advance 500
run
connected

# Connection receives 3 chunks of data spaced 250 ms apart.
advance 250
run
activity
advance 250
run
activity
advance 250
run
activity

# Connection drops.
disconnected
run

# Back off for 4000 ms.
timeout
run
],
  [### t=1000 ###
enable
  in BACKOFF for 0 ms (0 ms backoff)

# First connection attempt fails after 1000 ms.
run
  should connect
connecting
  in CONNECTING for 0 ms (0 ms backoff)
run
timeout
  advance 1000 ms

### t=2000 ###
  in CONNECTING for 1000 ms (0 ms backoff)
run
  should disconnect
connect-failed
  in BACKOFF for 0 ms (1000 ms backoff)
  0 successful connections out of 1 attempts, seqno 0

# Back off for 1000 ms.
timeout
  advance 1000 ms

### t=3000 ###
  in BACKOFF for 1000 ms (1000 ms backoff)
run
  should connect

# Second connection attempt fails after 1000 ms.
connecting
  in CONNECTING for 0 ms (1000 ms backoff)
timeout
  advance 1000 ms

### t=4000 ###
  in CONNECTING for 1000 ms (1000 ms backoff)
run
  should disconnect
connect-failed
  in BACKOFF for 0 ms (2000 ms backoff)
  0 successful connections out of 2 attempts, seqno 0

# Back off for 2000 ms.
timeout
  advance 2000 ms

### t=6000 ###
  in BACKOFF for 2000 ms (2000 ms backoff)
run
  should connect

# Third connection attempt succeeds after 500 ms.
connecting
  in CONNECTING for 0 ms (2000 ms backoff)
advance 500

### t=6500 ###
  in CONNECTING for 500 ms (2000 ms backoff)
run
connected
  in ACTIVE for 0 ms (2000 ms backoff)
  created 1000, last activity 1000, last connected 6500
  1 successful connections out of 3 attempts, seqno 1
  connected
  last connected 0 ms ago, connected 0 ms total

# Connection receives 3 chunks of data spaced 250 ms apart.
advance 250

### t=6750 ###
  in ACTIVE for 250 ms (2000 ms backoff)
run
activity
  created 1000, last activity 6750, last connected 6500
advance 250

### t=7000 ###
  in ACTIVE for 500 ms (2000 ms backoff)
run
activity
  created 1000, last activity 7000, last connected 6500
advance 250

### t=7250 ###
  in ACTIVE for 750 ms (2000 ms backoff)
run
activity
  created 1000, last activity 7250, last connected 6500

# Connection drops.
disconnected
  in BACKOFF for 0 ms (4000 ms backoff)
  1 successful connections out of 3 attempts, seqno 2
  disconnected
  disconnected at 7250 ms (0 ms ago)
run

# Back off for 4000 ms.
timeout
  advance 4000 ms

### t=11250 ###
  in BACKOFF for 4000 ms (4000 ms backoff)
  last connected 4750 ms ago, connected 750 ms total
run
  should connect
])

######################################################################
RECONNECT_CHECK([long connection resets backoff],
  [enable

# First connection attempt fails after 1000 ms.
run
connecting
run
timeout
run
connect-failed

# Back off for 1000 ms.
timeout
run

# Second connection attempt fails after 1000 ms.
connecting
timeout
run
connect-failed

# Back off for 2000 ms.
timeout
run

# Third connection attempt succeeds after 500 ms.
connecting
advance 500
run
connected

# Connection receives 3 chunks of data spaced 2000 ms apart.
advance 2000
run
activity
advance 2000
run
activity
advance 2000
run
activity

# Connection drops.
disconnected
run

# Back off for 1000 ms.
timeout
run
],
  [### t=1000 ###
enable
  in BACKOFF for 0 ms (0 ms backoff)

# First connection attempt fails after 1000 ms.
run
  should connect
connecting
  in CONNECTING for 0 ms (0 ms backoff)
run
timeout
  advance 1000 ms

### t=2000 ###
  in CONNECTING for 1000 ms (0 ms backoff)
run
  should disconnect
connect-failed
  in BACKOFF for 0 ms (1000 ms backoff)
  0 successful connections out of 1 attempts, seqno 0

# Back off for 1000 ms.
timeout
  advance 1000 ms

### t=3000 ###
  in BACKOFF for 1000 ms (1000 ms backoff)
run
  should connect

# Second connection attempt fails after 1000 ms.
connecting
  in CONNECTING for 0 ms (1000 ms backoff)
timeout
  advance 1000 ms

### t=4000 ###
  in CONNECTING for 1000 ms (1000 ms backoff)
run
  should disconnect
connect-failed
  in BACKOFF for 0 ms (2000 ms backoff)
  0 successful connections out of 2 attempts, seqno 0

# Back off for 2000 ms.
timeout
  advance 2000 ms

### t=6000 ###
  in BACKOFF for 2000 ms (2000 ms backoff)
run
  should connect

# Third connection attempt succeeds after 500 ms.
connecting
  in CONNECTING for 0 ms (2000 ms backoff)
advance 500

### t=6500 ###
  in CONNECTING for 500 ms (2000 ms backoff)
run
connected
  in ACTIVE for 0 ms (2000 ms backoff)
  created 1000, last activity 1000, last connected 6500
  1 successful connections out of 3 attempts, seqno 1
  connected
  last connected 0 ms ago, connected 0 ms total

# Connection receives 3 chunks of data spaced 2000 ms apart.
advance 2000

### t=8500 ###
  in ACTIVE for 2000 ms (2000 ms backoff)
run
activity
  created 1000, last activity 8500, last connected 6500
advance 2000

### t=10500 ###
  in ACTIVE for 4000 ms (2000 ms backoff)
run
activity
  created 1000, last activity 10500, last connected 6500
advance 2000

### t=12500 ###
  in ACTIVE for 6000 ms (2000 ms backoff)
run
activity
  created 1000, last activity 12500, last connected 6500

# Connection drops.
disconnected
  in BACKOFF for 0 ms (1000 ms backoff)
  1 successful connections out of 3 attempts, seqno 2
  disconnected
  disconnected at 12500 ms (0 ms ago)
run

# Back off for 1000 ms.
timeout
  advance 1000 ms

### t=13500 ###
  in BACKOFF for 1000 ms (1000 ms backoff)
  last connected 7000 ms ago, connected 6000 ms total
run
  should connect
])

######################################################################
RECONNECT_CHECK([connection attempt fails quickly],
  [enable

# Connection fails quickly.
run
connect-failed ECONNREFUSED

# Back off for 1000 ms.
run
timeout

# Connection fails quickly again.
run
connect-failed ECONNREFUSED

# Back off for 2000 ms.
run
timeout
],
   [### t=1000 ###
enable
  in BACKOFF for 0 ms (0 ms backoff)

# Connection fails quickly.
run
  should connect
connect-failed ECONNREFUSED
  in BACKOFF for 0 ms (1000 ms backoff)
  0 successful connections out of 1 attempts, seqno 0

# Back off for 1000 ms.
run
timeout
  advance 1000 ms

### t=2000 ###
  in BACKOFF for 1000 ms (1000 ms backoff)

# Connection fails quickly again.
run
  should connect
connect-failed ECONNREFUSED
  in BACKOFF for 0 ms (2000 ms backoff)
  0 successful connections out of 2 attempts, seqno 0

# Back off for 2000 ms.
run
timeout
  advance 2000 ms

### t=4000 ###
  in BACKOFF for 2000 ms (2000 ms backoff)
])

######################################################################
RECONNECT_CHECK([max-tries of 1 honored],
  [set-max-tries 1
enable

# Connection succeeds.
run
connected

# Send inactivity probe.
timeout
run

# Idle timeout kills connection.
timeout
run
disconnected
],
  [### t=1000 ###
set-max-tries 1
  1 tries left
enable
  in BACKOFF for 0 ms (0 ms backoff)
  0 tries left

# Connection succeeds.
run
  should connect
connected
  in ACTIVE for 0 ms (0 ms backoff)
  created 1000, last activity 1000, last connected 1000
  1 successful connections out of 1 attempts, seqno 1
  connected
  last connected 0 ms ago, connected 0 ms total

# Send inactivity probe.
timeout
  advance 5000 ms

### t=6000 ###
  in ACTIVE for 5000 ms (0 ms backoff)
run
  should send probe
  in IDLE for 0 ms (0 ms backoff)

# Idle timeout kills connection.
timeout
  advance 5000 ms

### t=11000 ###
  in IDLE for 5000 ms (0 ms backoff)
run
  should disconnect
disconnected
  in VOID for 0 ms (1000 ms backoff)
  1 successful connections out of 1 attempts, seqno 2
  disconnected
  disconnected at 11000 ms (0 ms ago)
])

######################################################################
RECONNECT_CHECK([max-tries of 0 honored],
  [set-max-tries 0
enable
run
timeout
],
  [### t=1000 ###
set-max-tries 0
  0 tries left
enable
run
timeout
  no timeout
])

######################################################################
RECONNECT_CHECK([passive mode],
  [passive
enable

# Start listening.
timeout
run
listening

# Listening never times out.
timeout
run

# Listening failed (accept() returned funny error?).  Back off and try again.
listen-error 0
timeout
run
listening

# Connection accepted.
connected
activity
advance 1000
activity

# Connection times out.
timeout
run
timeout
run
disconnected

# Start listening again.
timeout
run
listening
],
  [### t=1000 ###
passive
enable
  in BACKOFF for 0 ms (0 ms backoff)

# Start listening.
timeout
  advance 0 ms
run
  should connect
listening
  in LISTENING for 0 ms (0 ms backoff)

# Listening never times out.
timeout
  no timeout
run

# Listening failed (accept() returned funny error?).  Back off and try again.
listen-error 0
  in BACKOFF for 0 ms (1000 ms backoff)
timeout
  advance 1000 ms

### t=2000 ###
  in BACKOFF for 1000 ms (1000 ms backoff)
run
  should connect
listening
  in LISTENING for 0 ms (1000 ms backoff)

# Connection accepted.
connected
  in ACTIVE for 0 ms (1000 ms backoff)
  created 1000, last activity 1000, last connected 2000
  1 successful connections out of 1 attempts, seqno 1
  connected
  last connected 0 ms ago, connected 0 ms total
activity
  created 1000, last activity 2000, last connected 2000
advance 1000

### t=3000 ###
  in ACTIVE for 1000 ms (1000 ms backoff)
activity
  created 1000, last activity 3000, last connected 2000

# Connection times out.
timeout
  advance 5000 ms

### t=8000 ###
  in ACTIVE for 6000 ms (1000 ms backoff)
run
  should send probe
  in IDLE for 0 ms (1000 ms backoff)
timeout
  advance 5000 ms

### t=13000 ###
  in IDLE for 5000 ms (1000 ms backoff)
run
  should disconnect
disconnected
  in BACKOFF for 0 ms (0 ms backoff)
  1 successful connections out of 1 attempts, seqno 2
  disconnected
  disconnected at 13000 ms (0 ms ago)

# Start listening again.
timeout
  advance 0 ms
run
  should connect
listening
  in LISTENING for 0 ms (0 ms backoff)
])