It seems that we consistently fail to start the discovery session right after resume on eve. It eventually succeeds, but this adds a lot of delay (> 2s) to the flow.

The proximty auth logs are here:
13:18:54.048
proximity_auth_system.cc:105

Preparing for device suspension.

13:19:17.443
proximity_auth_system.cc:113

Device resumed from suspension.

13:19:17.444
proximity_auth_system.cc:170

User {"account_type":"unknown","email":""} does not have a RemoteDevice.

13:19:17.522
proximity_auth_system.cc:186

Creating RemoteDeviceLifeCycle for focused user:
{"account_type":"google","email":"sacomotosmartlock4@gmail.com","gaia_id":"104253985630965752975"}

13:19:17.525
remote_device_life_cycle_impl.cc:55

Life cycle for A0:91:69:28:41:E6 started.

13:19:17.527
bluetooth_low_energy_connection_finder.cc:85

Finding connection

13:19:17.528
bluetooth_low_energy_connection_finder.cc:182

Adapter ready

13:19:17.529
remote_device_life_cycle_impl.cc:111

Life cycle transition: 0 => 1

13:19:17.530
unlock_manager_impl.cc:159

RemoteDeviceLifeCycle state changed: 1

13:19:17.530
unlock_manager_impl.cc:427

Updating screenlock state from 0 to 2

13:19:17.708
unlock_manager_impl.cc:427

Updating screenlock state from 2 to 1

13:19:17.709
bluetooth_low_energy_connection_finder.cc:100

Adapter powered: 0

13:19:17.713
bluetooth_low_energy_connection_finder.cc:195

Error starting discovery session, restarting in 2 seconds.

13:19:18.099
unlock_manager_impl.cc:427

Updating screenlock state from 1 to 2

13:19:18.101
bluetooth_low_energy_connection_finder.cc:100

Adapter powered: 1

13:19:18.105
bluetooth_low_energy_connection_finder.cc:190

Discovery session started

13:19:18.383
bluetooth_low_energy_connection_finder.cc:167

Generating EIDs for: 5F:B4:81:BD:29:0A

13:19:18.384
background_eid_generator.cc:70

Generated EIDs: [
  (1503398700000: 0x5f09),
  (1503399600000: 0xd6aa),
  (1503400500000: 0x4960),
  (1503401400000: 0x945e),
  (1503402300000: 0x106b),
]

13:19:18.386
bluetooth_low_energy_connection_finder.cc:173

Found a matching EID: 0x4960

13:19:18.387
bluetooth_low_energy_connection_finder.cc:147

Connecting to device 5F:B4:81:BD:29:0A

13:19:18.389
bluetooth_low_energy_connection_finder.cc:244

OnConnectionStatusChanged: 0 -> 1

13:19:18.390
bluetooth_low_energy_connection_finder.cc:226

Stopping discovery session

13:19:18.393
bluetooth_low_energy_weave_client_connection.cc:186

Creating GATT connection with 5F:B4:81:BD:29:0A

13:19:19.714
bluetooth_low_energy_connection_finder.cc:271

Restarting discovery session.

13:19:19.715
bluetooth_low_energy_weave_client_connection.cc:216

Disconnecting from 5F:B4:81:BD:29:0A

13:19:19.719
bluetooth_low_energy_connection_finder.cc:190

Discovery session started

13:19:20.143
bluetooth_low_energy_connection_finder.cc:167

Generating EIDs for: 5F:B4:81:BD:29:0A

13:19:20.144
background_eid_generator.cc:70

Generated EIDs: [
  (1503398700000: 0x5f09),
  (1503399600000: 0xd6aa),
  (1503400500000: 0x4960),
  (1503401400000: 0x945e),
  (1503402300000: 0x106b),
]

13:19:20.145
bluetooth_low_energy_connection_finder.cc:173

Found a matching EID: 0x4960

13:19:20.145
bluetooth_low_energy_connection_finder.cc:147

Connecting to device 5F:B4:81:BD:29:0A

13:19:20.146
bluetooth_low_energy_connection_finder.cc:244

OnConnectionStatusChanged: 0 -> 1

13:19:20.147
bluetooth_low_energy_connection_finder.cc:226

Stopping discovery session

13:19:20.718
bluetooth_low_energy_weave_client_connection.cc:186

Creating GATT connection with 5F:B4:81:BD:29:0A

13:19:21.968
bluetooth_low_energy_weave_client_connection.cc:281

GATT connection dropped 5F:B4:81:BD:29:0A
device connected: 0
gatt connection: 0

13:19:21.970
bluetooth_low_energy_weave_client_connection.cc:216

Disconnecting from 5F:B4:81:BD:29:0A

13:19:21.972
bluetooth_low_energy_connection_finder.cc:244

OnConnectionStatusChanged: 1 -> 0

13:19:21.974
bluetooth_low_energy_connection_finder.cc:261

Connection failed. Retrying.

13:19:21.976
bluetooth_low_energy_connection_finder.cc:271

Restarting discovery session.

13:19:21.985
bluetooth_low_energy_connection_finder.cc:190

Discovery session started

13:19:22.189
bluetooth_low_energy_connection_finder.cc:167

Generating EIDs for: 5F:B4:81:BD:29:0A

13:19:22.191
background_eid_generator.cc:70

Generated EIDs: [
  (1503398700000: 0x5f09),
  (1503399600000: 0xd6aa),
  (1503400500000: 0x4960),
  (1503401400000: 0x945e),
  (1503402300000: 0x106b),
]

13:19:22.193
bluetooth_low_energy_connection_finder.cc:173

Found a matching EID: 0x4960

13:19:22.194
bluetooth_low_energy_connection_finder.cc:147

Connecting to device 5F:B4:81:BD:29:0A

13:19:22.196
bluetooth_low_energy_connection_finder.cc:244

OnConnectionStatusChanged: 0 -> 1

13:19:22.197
bluetooth_low_energy_connection_finder.cc:226

Stopping discovery session

13:19:22.978
bluetooth_low_energy_weave_client_connection.cc:186

Creating GATT connection with 5F:B4:81:BD:29:0A

13:19:24.525
bluetooth_low_energy_weave_client_connection.cc:476

Sending connection request message.

13:19:24.527
bluetooth_low_energy_weave_client_connection.cc:507

Writing 7 bytes.

13:19:24.561
bluetooth_low_energy_connection_finder.cc:244

OnConnectionStatusChanged: 1 -> 2

13:19:24.562
remote_device_life_cycle_impl.cc:111

Life cycle transition: 1 => 2

13:19:24.563
unlock_manager_impl.cc:159

RemoteDeviceLifeCycle state changed: 2

13:19:24.564
device_to_device_authenticator.cc:136

Sending [Initiator Hello] message.

13:19:24.565
bluetooth_low_energy_weave_client_connection.cc:507

Writing 203 bytes.

13:19:24.883
device_to_device_authenticator.cc:237

Received [Responder Auth] message, payload_size=325

13:19:24.902
device_to_device_authenticator.cc:165

Successfully validated [Responder Auth]! Sending [Initiator Auth]...

13:19:24.907
bluetooth_low_energy_weave_client_connection.cc:507

Writing 255 bytes.

13:19:24.929
device_to_device_authenticator.cc:210

Authentication succeeded!

13:19:24.932
remote_device_life_cycle_impl.cc:111

Life cycle transition: 2 => 3

13:19:24.935
unlock_manager_impl.cc:159

RemoteDeviceLifeCycle state changed: 3

13:19:24.941
proximity_monitor_impl.cc:200

  Rolling RSSI: -42

13:19:24.943
proximity_monitor_impl.cc:203

[Proximity] Updated proximity state: proximate

13:19:24.945
unlock_manager_impl.cc:239

Proximity state changed.

13:19:24.977
unlock_manager_impl.cc:188

Status Update: (user_present=0, secure_screen_lock=0, trust_agent=1)

13:19:24.977
unlock_manager_impl.cc:427

Updating screenlock state from 2 to 10

13:19:25.024
unlock_manager_impl.cc:188

Status Update: (user_present=0, secure_screen_lock=0, trust_agent=1)

13:19:25.190
proximity_monitor_impl.cc:200

  Rolling RSSI: -42

13:19:25.440
proximity_monitor_impl.cc:200

  Rolling RSSI: -42

13:19:25.678
bluetooth_low_energy_weave_client_connection.cc:507

Writing 178 bytes.

13:19:25.690
proximity_monitor_impl.cc:200

  Rolling RSSI: -42

13:19:25.735
unlock_manager_impl.cc:226

Unlock response from remote device: success

13:19:25.739
bluetooth_low_energy_weave_client_connection.cc:507

Writing 198 bytes.

13:19:25.761
unlock_manager_impl.cc:480

Finalizing unlock...

13:19:25.940
proximity_monitor_impl.cc:200

  Rolling RSSI: -42

13:19:26.156
unlock_manager_impl.cc:427

Updating screenlock state from 10 to 0

13:19:26.157
bluetooth_low_energy_weave_client_connection.cc:216

Disconnecting from 5F:B4:81:BD:29:0A