tests: settings: delay after connection for log flush

When registering settings during the HIL test, we get a flood
of log messages. On some platforms this can overwhelm the log
buffer and lead to dropped messages. If one of those dropped
messages is the connection message that the test scripts wait
for, the test will fail. Adding a small delay between the
connection to Golioth and registering the settings will give time
for the log buffer to flush, ensuring the test script receives the
connection message, and increasing the stability of the test.

Signed-off-by: Sam Friedman <[email protected]>

tests/hil/tests/settings/test.c

@@ -126,6 +126,10 @@ void hil_test_entry(const struct golioth_client_config *config)
 
     golioth_sys_sem_take(connected_sem, GOLIOTH_SYS_WAIT_FOREVER);
 
+    /* Allow log buffer to clear before registering settings */
+
+    golioth_sys_msleep(5 * 1000);
+
     struct golioth_settings *settings = perform_settings_registration(client);
 
     while (1)