Double IP_ADDRESS_TIMEOUT to reduce races

Fix an issue where the Fuchsia device takes slightly longer than 15
seconds to acquire an IP address.

Fixed: b/297417918
Change-Id: I2eab9e02dea5483279b3b25fbca535d4d1b33192
Reviewed-on: https://fuchsia-review.googlesource.com/c/antlion/+/906824
Reviewed-by: Karl Ward <karlward@google.com>
Fuchsia-Auto-Submit: Sam Balana <sbalana@google.com>
Reviewed-by: Charles Celerier <chcl@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
Reviewed-by: Marc Khouri <mnck@google.com>

packages/antlion/controllers/fuchsia_device.py

diff --git a/packages/antlion/controllers/fuchsia_device.py b/packages/antlion/controllers/fuchsia_device.py
index abcfd53..f77127a 100644
--- a/packages/antlion/controllers/fuchsia_device.py
+++ b/packages/antlion/controllers/fuchsia_device.py
@@ -86,7 +86,17 @@
 MDNS_LOOKUP_RETRY_MAX = 3
 
 VALID_ASSOCIATION_MECHANISMS = {None, "policy", "drivers"}
-IP_ADDRESS_TIMEOUT = 15
+
+# Duration to wait for the Fuchsia device to acquire an IP address after
+# requested to join a network.
+#
+# Acquiring an IP address after connecting to a WLAN network could take up to
+# 15 seconds if we get unlucky:
+#
+#  1. An outgoing passive scan just started (~7s)
+#  2. An active scan is queued for the newly saved network (~7s)
+#  3. The initial connection attempt fails (~1s)
+IP_ADDRESS_TIMEOUT = 30
 
 
 class FuchsiaDeviceError(signals.ControllerError):