diff --git a/services/tests/servicestests/src/com/android/server/connectivity/IpConnectivityEventBuilderTest.java b/services/tests/servicestests/src/com/android/server/connectivity/IpConnectivityEventBuilderTest.java
index 84f0f90..011e505 100644
--- a/services/tests/servicestests/src/com/android/server/connectivity/IpConnectivityEventBuilderTest.java
+++ b/services/tests/servicestests/src/com/android/server/connectivity/IpConnectivityEventBuilderTest.java
@@ -16,6 +16,17 @@
 
 package com.android.server.connectivity;
 
+import static com.android.server.connectivity.MetricsTestUtil.aBool;
+import static com.android.server.connectivity.MetricsTestUtil.aByteArray;
+import static com.android.server.connectivity.MetricsTestUtil.aLong;
+import static com.android.server.connectivity.MetricsTestUtil.aString;
+import static com.android.server.connectivity.MetricsTestUtil.aType;
+import static com.android.server.connectivity.MetricsTestUtil.anInt;
+import static com.android.server.connectivity.MetricsTestUtil.anIntArray;
+import static com.android.server.connectivity.MetricsTestUtil.b;
+import static com.android.server.connectivity.MetricsTestUtil.describeIpEvent;
+import static com.android.server.connectivity.metrics.IpConnectivityLogClass.IpConnectivityLog;
+
 import android.net.ConnectivityMetricsEvent;
 import android.net.metrics.ApfProgramEvent;
 import android.net.metrics.ApfStats;
@@ -28,24 +39,13 @@
 import android.net.metrics.NetworkEvent;
 import android.net.metrics.RaEvent;
 import android.net.metrics.ValidationProbeEvent;
-import com.google.protobuf.nano.MessageNano;
+import android.test.suitebuilder.annotation.SmallTest;
 import java.util.Arrays;
 import junit.framework.TestCase;
 
-import static com.android.server.connectivity.metrics.IpConnectivityLogClass.IpConnectivityLog;
-import static com.android.server.connectivity.MetricsTestUtil.aBool;
-import static com.android.server.connectivity.MetricsTestUtil.aByteArray;
-import static com.android.server.connectivity.MetricsTestUtil.aLong;
-import static com.android.server.connectivity.MetricsTestUtil.aString;
-import static com.android.server.connectivity.MetricsTestUtil.aType;
-import static com.android.server.connectivity.MetricsTestUtil.anInt;
-import static com.android.server.connectivity.MetricsTestUtil.anIntArray;
-import static com.android.server.connectivity.MetricsTestUtil.b;
-import static com.android.server.connectivity.MetricsTestUtil.describeIpEvent;
-import static com.android.server.connectivity.MetricsTestUtil.ipEv;
-
 public class IpConnectivityEventBuilderTest extends TestCase {
 
+    @SmallTest
     public void testDefaultNetworkEventSerialization() {
         ConnectivityMetricsEvent ev = describeIpEvent(
                 aType(DefaultNetworkEvent.class),
@@ -58,6 +58,8 @@
         String want = joinLines(
                 "dropped_events: 0",
                 "events <",
+                "  time_ms: 1",
+                "  transport: 0",
                 "  default_network_event <",
                 "    network_id <",
                 "      network_id: 102",
@@ -70,13 +72,13 @@
                 "    transport_types: 2",
                 "    transport_types: 3",
                 "  >",
-                "  time_ms: 1",
                 ">",
                 "version: 2");
 
         verifySerialization(want, ev);
     }
 
+    @SmallTest
     public void testDhcpClientEventSerialization() {
         ConnectivityMetricsEvent ev = describeIpEvent(
                 aType(DhcpClientEvent.class),
@@ -87,19 +89,20 @@
         String want = joinLines(
                 "dropped_events: 0",
                 "events <",
+                "  time_ms: 1",
+                "  transport: 0",
                 "  dhcp_event <",
                 "    duration_ms: 192",
-                "    error_code: 0",
                 "    if_name: \"wlan0\"",
                 "    state_transition: \"SomeState\"",
                 "  >",
-                "  time_ms: 1",
                 ">",
                 "version: 2");
 
         verifySerialization(want, ev);
     }
 
+    @SmallTest
     public void testDhcpErrorEventSerialization() {
         ConnectivityMetricsEvent ev = describeIpEvent(
                 aType(DhcpErrorEvent.class),
@@ -109,19 +112,20 @@
         String want = joinLines(
                 "dropped_events: 0",
                 "events <",
+                "  time_ms: 1",
+                "  transport: 0",
                 "  dhcp_event <",
                 "    duration_ms: 0",
-                "    error_code: 50397184",
                 "    if_name: \"wlan0\"",
-                "    state_transition: \"\"",
+                "    error_code: 50397184",
                 "  >",
-                "  time_ms: 1",
                 ">",
                 "version: 2");
 
         verifySerialization(want, ev);
     }
 
+    @SmallTest
     public void testDnsEventSerialization() {
         ConnectivityMetricsEvent ev = describeIpEvent(
                 aType(DnsEvent.class),
@@ -133,6 +137,8 @@
         String want = joinLines(
                 "dropped_events: 0",
                 "events <",
+                "  time_ms: 1",
+                "  transport: 0",
                 "  dns_lookup_batch <",
                 "    event_types: 1",
                 "    event_types: 1",
@@ -162,13 +168,13 @@
                 "    return_codes: 200",
                 "    return_codes: 178",
                 "  >",
-                "  time_ms: 1",
                 ">",
                 "version: 2");
 
         verifySerialization(want, ev);
     }
 
+    @SmallTest
     public void testIpManagerEventSerialization() {
         ConnectivityMetricsEvent ev = describeIpEvent(
                 aType(IpManagerEvent.class),
@@ -179,18 +185,20 @@
         String want = joinLines(
                 "dropped_events: 0",
                 "events <",
+                "  time_ms: 1",
+                "  transport: 0",
                 "  ip_provisioning_event <",
                 "    event_type: 1",
                 "    if_name: \"wlan0\"",
                 "    latency_ms: 5678",
                 "  >",
-                "  time_ms: 1",
                 ">",
                 "version: 2");
 
         verifySerialization(want, ev);
     }
 
+    @SmallTest
     public void testIpReachabilityEventSerialization() {
         ConnectivityMetricsEvent ev = describeIpEvent(
                 aType(IpReachabilityEvent.class),
@@ -200,17 +208,19 @@
         String want = joinLines(
                 "dropped_events: 0",
                 "events <",
+                "  time_ms: 1",
+                "  transport: 0",
                 "  ip_reachability_event <",
                 "    event_type: 512",
                 "    if_name: \"wlan0\"",
                 "  >",
-                "  time_ms: 1",
                 ">",
                 "version: 2");
 
         verifySerialization(want, ev);
     }
 
+    @SmallTest
     public void testNetworkEventSerialization() {
         ConnectivityMetricsEvent ev = describeIpEvent(
                 aType(NetworkEvent.class),
@@ -221,6 +231,8 @@
         String want = joinLines(
                 "dropped_events: 0",
                 "events <",
+                "  time_ms: 1",
+                "  transport: 0",
                 "  network_event <",
                 "    event_type: 5",
                 "    latency_ms: 20410",
@@ -228,13 +240,13 @@
                 "      network_id: 100",
                 "    >",
                 "  >",
-                "  time_ms: 1",
                 ">",
                 "version: 2");
 
         verifySerialization(want, ev);
     }
 
+    @SmallTest
     public void testValidationProbeEventSerialization() {
         ConnectivityMetricsEvent ev = describeIpEvent(
                 aType(ValidationProbeEvent.class),
@@ -247,6 +259,7 @@
                 "dropped_events: 0",
                 "events <",
                 "  time_ms: 1",
+                "  transport: 0",
                 "  validation_probe_event <",
                 "    latency_ms: 40730",
                 "    network_id <",
@@ -261,6 +274,7 @@
         verifySerialization(want, ev);
     }
 
+    @SmallTest
     public void testApfProgramEventSerialization() {
         ConnectivityMetricsEvent ev = describeIpEvent(
                 aType(ApfProgramEvent.class),
@@ -273,6 +287,8 @@
         String want = joinLines(
                 "dropped_events: 0",
                 "events <",
+                "  time_ms: 1",
+                "  transport: 0",
                 "  apf_program_event <",
                 "    current_ras: 9",
                 "    drop_multicast: true",
@@ -281,13 +297,13 @@
                 "    lifetime: 200",
                 "    program_length: 2048",
                 "  >",
-                "  time_ms: 1",
                 ">",
                 "version: 2");
 
         verifySerialization(want, ev);
     }
 
+    @SmallTest
     public void testApfStatsSerialization() {
         ConnectivityMetricsEvent ev = describeIpEvent(
                 aType(ApfStats.class),
@@ -303,6 +319,8 @@
         String want = joinLines(
                 "dropped_events: 0",
                 "events <",
+                "  time_ms: 1",
+                "  transport: 0",
                 "  apf_statistics <",
                 "    dropped_ras: 2",
                 "    duration_ms: 45000",
@@ -313,13 +331,13 @@
                 "    received_ras: 10",
                 "    zero_lifetime_ras: 1",
                 "  >",
-                "  time_ms: 1",
                 ">",
                 "version: 2");
 
         verifySerialization(want, ev);
     }
 
+    @SmallTest
     public void testRaEventSerialization() {
         ConnectivityMetricsEvent ev = describeIpEvent(
                 aType(RaEvent.class),
@@ -333,6 +351,8 @@
         String want = joinLines(
                 "dropped_events: 0",
                 "events <",
+                "  time_ms: 1",
+                "  transport: 0",
                 "  ra_event <",
                 "    dnssl_lifetime: -1",
                 "    prefix_preferred_lifetime: 300",
@@ -341,7 +361,6 @@
                 "    route_info_lifetime: -1",
                 "    router_lifetime: 2000",
                 "  >",
-                "  time_ms: 1",
                 ">",
                 "version: 2");
 
@@ -350,9 +369,9 @@
 
     static void verifySerialization(String want, ConnectivityMetricsEvent... input) {
         try {
-            byte[] got = IpConnectivityEventBuilder.serialize(0, Arrays.asList(input));
-            IpConnectivityLog log = new IpConnectivityLog();
-            MessageNano.mergeFrom(log, got);
+            byte[] got = IpConnectivityEventBuilder.serialize(0,
+                    IpConnectivityEventBuilder.toProto(Arrays.asList(input)));
+            IpConnectivityLog log = IpConnectivityLog.parseFrom(got);
             assertEquals(want, log.toString());
         } catch (Exception e) {
             fail(e.toString());
diff --git a/services/tests/servicestests/src/com/android/server/connectivity/IpConnectivityMetricsTest.java b/services/tests/servicestests/src/com/android/server/connectivity/IpConnectivityMetricsTest.java
index aa491bb..450653c 100644
--- a/services/tests/servicestests/src/com/android/server/connectivity/IpConnectivityMetricsTest.java
+++ b/services/tests/servicestests/src/com/android/server/connectivity/IpConnectivityMetricsTest.java
@@ -16,6 +16,9 @@
 
 package com.android.server.connectivity;
 
+import static org.mockito.Mockito.timeout;
+import static org.mockito.Mockito.verify;
+
 import android.content.Context;
 import android.net.ConnectivityMetricsEvent;
 import android.net.IIpConnectivityMetrics;
@@ -29,9 +32,9 @@
 import android.net.metrics.RaEvent;
 import android.net.metrics.ValidationProbeEvent;
 import android.os.Parcelable;
+import android.test.suitebuilder.annotation.SmallTest;
 import android.util.Base64;
 import com.android.server.connectivity.metrics.IpConnectivityLogClass;
-import com.google.protobuf.nano.MessageNano;
 import java.io.PrintWriter;
 import java.io.StringWriter;
 import java.util.Collections;
@@ -43,10 +46,6 @@
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 
-import static org.mockito.Mockito.timeout;
-import static org.mockito.Mockito.times;
-import static org.mockito.Mockito.verify;
-
 public class IpConnectivityMetricsTest extends TestCase {
     static final IpReachabilityEvent FAKE_EV =
             new IpReachabilityEvent("wlan0", IpReachabilityEvent.NUD_FAILED);
@@ -61,6 +60,7 @@
         mService = new IpConnectivityMetrics(mCtx, (ctx) -> 2000);
     }
 
+    @SmallTest
     public void testLoggingEvents() throws Exception {
         IpConnectivityLog logger = new IpConnectivityLog(mMockService);
 
@@ -74,6 +74,7 @@
         assertEventsEqual(expectedEvent(3), got.get(2));
     }
 
+    @SmallTest
     public void testLoggingEventsWithMultipleCallers() throws Exception {
         IpConnectivityLog logger = new IpConnectivityLog(mMockService);
 
@@ -101,6 +102,7 @@
         }
     }
 
+    @SmallTest
     public void testBufferFlushing() {
         String output1 = getdump("flush");
         assertEquals("", output1);
@@ -113,6 +115,7 @@
         assertEquals("", output3);
     }
 
+    @SmallTest
     public void testRateLimiting() {
         final IpConnectivityLog logger = new IpConnectivityLog(mService.impl);
         final ApfProgramEvent ev = new ApfProgramEvent(0, 0, 0, 0, 0);
@@ -134,6 +137,7 @@
         assertEquals("", output2);
     }
 
+    @SmallTest
     public void testEndToEndLogging() {
         IpConnectivityLog logger = new IpConnectivityLog(mService.impl);
 
@@ -154,22 +158,25 @@
         String want = joinLines(
                 "dropped_events: 0",
                 "events <",
+                "  time_ms: 100",
+                "  transport: 0",
                 "  ip_reachability_event <",
                 "    event_type: 512",
                 "    if_name: \"wlan0\"",
                 "  >",
-                "  time_ms: 100",
                 ">",
                 "events <",
+                "  time_ms: 200",
+                "  transport: 0",
                 "  dhcp_event <",
                 "    duration_ms: 192",
-                "    error_code: 0",
                 "    if_name: \"wlan0\"",
                 "    state_transition: \"SomeState\"",
                 "  >",
-                "  time_ms: 200",
                 ">",
                 "events <",
+                "  time_ms: 300",
+                "  transport: 0",
                 "  default_network_event <",
                 "    network_id <",
                 "      network_id: 102",
@@ -182,18 +189,19 @@
                 "    transport_types: 2",
                 "    transport_types: 3",
                 "  >",
-                "  time_ms: 300",
                 ">",
                 "events <",
+                "  time_ms: 400",
+                "  transport: 0",
                 "  ip_provisioning_event <",
                 "    event_type: 1",
                 "    if_name: \"wlan0\"",
                 "    latency_ms: 5678",
                 "  >",
-                "  time_ms: 400",
                 ">",
                 "events <",
                 "  time_ms: 500",
+                "  transport: 0",
                 "  validation_probe_event <",
                 "    latency_ms: 40730",
                 "    network_id <",
@@ -204,6 +212,8 @@
                 "  >",
                 ">",
                 "events <",
+                "  time_ms: 600",
+                "  transport: 0",
                 "  apf_statistics <",
                 "    dropped_ras: 2",
                 "    duration_ms: 45000",
@@ -214,9 +224,10 @@
                 "    received_ras: 10",
                 "    zero_lifetime_ras: 1",
                 "  >",
-                "  time_ms: 600",
                 ">",
                 "events <",
+                "  time_ms: 700",
+                "  transport: 0",
                 "  ra_event <",
                 "    dnssl_lifetime: -1",
                 "    prefix_preferred_lifetime: 300",
@@ -225,7 +236,6 @@
                 "    route_info_lifetime: -1",
                 "    router_lifetime: 2000",
                 "  >",
-                "  time_ms: 700",
                 ">",
                 "version: 2");
 
@@ -254,8 +264,7 @@
         try {
             byte[] got = Base64.decode(output, Base64.DEFAULT);
             IpConnectivityLogClass.IpConnectivityLog log =
-                    new IpConnectivityLogClass.IpConnectivityLog();
-            MessageNano.mergeFrom(log, got);
+                    IpConnectivityLogClass.IpConnectivityLog.parseFrom(got);
             assertEquals(want, log.toString());
         } catch (Exception e) {
             fail(e.toString());
@@ -283,10 +292,5 @@
     }
 
     static final Comparator<ConnectivityMetricsEvent> EVENT_COMPARATOR =
-        new Comparator<ConnectivityMetricsEvent>() {
-            @Override
-            public int compare(ConnectivityMetricsEvent ev1, ConnectivityMetricsEvent ev2) {
-                return (int) (ev1.timestamp - ev2.timestamp);
-            }
-        };
+        Comparator.comparingLong((ev) -> ev.timestamp);
 }
diff --git a/services/tests/servicestests/src/com/android/server/connectivity/NetdEventListenerServiceTest.java b/services/tests/servicestests/src/com/android/server/connectivity/NetdEventListenerServiceTest.java
index af4a374..97afa60 100644
--- a/services/tests/servicestests/src/com/android/server/connectivity/NetdEventListenerServiceTest.java
+++ b/services/tests/servicestests/src/com/android/server/connectivity/NetdEventListenerServiceTest.java
@@ -16,24 +16,34 @@
 
 package com.android.server.connectivity;
 
-import android.net.ConnectivityManager.NetworkCallback;
 import android.net.ConnectivityManager;
+import android.net.ConnectivityManager.NetworkCallback;
 import android.net.Network;
 import android.net.metrics.DnsEvent;
 import android.net.metrics.INetdEventListener;
 import android.net.metrics.IpConnectivityLog;
 import android.os.RemoteException;
-
+import android.system.OsConstants;
+import android.test.suitebuilder.annotation.SmallTest;
+import com.android.server.connectivity.metrics.IpConnectivityLogClass.IpConnectivityEvent;
+import java.io.FileOutputStream;
+import java.io.PrintWriter;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Comparator;
+import java.util.List;
+import java.util.OptionalInt;
+import java.util.stream.IntStream;
 import junit.framework.TestCase;
 import org.junit.Before;
 import org.junit.Test;
-import static org.junit.Assert.assertArrayEquals;
-import static org.junit.Assert.assertTrue;
-
 import org.mockito.ArgumentCaptor;
 import org.mockito.Mock;
 import org.mockito.Mockito;
 import org.mockito.MockitoAnnotations;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertTrue;
 import static org.mockito.Mockito.any;
 import static org.mockito.Mockito.anyInt;
 import static org.mockito.Mockito.eq;
@@ -41,13 +51,6 @@
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 
-import java.io.FileOutputStream;
-import java.io.PrintWriter;
-import java.util.Arrays;
-import java.util.List;
-import java.util.OptionalInt;
-import java.util.stream.IntStream;
-
 public class NetdEventListenerServiceTest extends TestCase {
 
     // TODO: read from NetdEventListenerService after this constant is read from system property
@@ -67,50 +70,56 @@
         }
     }
 
+    private static final String EXAMPLE_IPV4 = "192.0.2.1";
+    private static final String EXAMPLE_IPV6 = "2001:db8:1200::2:1";
+
     NetdEventListenerService mNetdEventListenerService;
 
     @Mock ConnectivityManager mCm;
     @Mock IpConnectivityLog mLog;
     ArgumentCaptor<NetworkCallback> mCallbackCaptor;
-    ArgumentCaptor<DnsEvent> mEvCaptor;
+    ArgumentCaptor<DnsEvent> mDnsEvCaptor;
 
     public void setUp() {
         MockitoAnnotations.initMocks(this);
         mCallbackCaptor = ArgumentCaptor.forClass(NetworkCallback.class);
-        mEvCaptor = ArgumentCaptor.forClass(DnsEvent.class);
+        mDnsEvCaptor = ArgumentCaptor.forClass(DnsEvent.class);
         mNetdEventListenerService = new NetdEventListenerService(mCm, mLog);
 
         verify(mCm, times(1)).registerNetworkCallback(any(), mCallbackCaptor.capture());
     }
 
-    public void testOneBatch() throws Exception {
+    @SmallTest
+    public void testOneDnsBatch() throws Exception {
         log(105, LATENCIES);
         log(106, Arrays.copyOf(LATENCIES, BATCH_SIZE - 1)); // one lookup short of a batch event
 
-        verifyLoggedEvents(new DnsEvent(105, EVENT_TYPES, RETURN_CODES, LATENCIES));
+        verifyLoggedDnsEvents(new DnsEvent(105, EVENT_TYPES, RETURN_CODES, LATENCIES));
 
         log(106, Arrays.copyOfRange(LATENCIES, BATCH_SIZE - 1, BATCH_SIZE));
 
-        mEvCaptor = ArgumentCaptor.forClass(DnsEvent.class); // reset argument captor
-        verifyLoggedEvents(
+        mDnsEvCaptor = ArgumentCaptor.forClass(DnsEvent.class); // reset argument captor
+        verifyLoggedDnsEvents(
             new DnsEvent(105, EVENT_TYPES, RETURN_CODES, LATENCIES),
             new DnsEvent(106, EVENT_TYPES, RETURN_CODES, LATENCIES));
     }
 
-    public void testSeveralBatches() throws Exception {
+    @SmallTest
+    public void testSeveralDmsBatches() throws Exception {
         log(105, LATENCIES);
         log(106, LATENCIES);
         log(105, LATENCIES);
         log(107, LATENCIES);
 
-        verifyLoggedEvents(
+        verifyLoggedDnsEvents(
             new DnsEvent(105, EVENT_TYPES, RETURN_CODES, LATENCIES),
             new DnsEvent(106, EVENT_TYPES, RETURN_CODES, LATENCIES),
             new DnsEvent(105, EVENT_TYPES, RETURN_CODES, LATENCIES),
             new DnsEvent(107, EVENT_TYPES, RETURN_CODES, LATENCIES));
     }
 
-    public void testBatchAndNetworkLost() throws Exception {
+    @SmallTest
+    public void testDnsBatchAndNetworkLost() throws Exception {
         byte[] eventTypes = Arrays.copyOf(EVENT_TYPES, 20);
         byte[] returnCodes = Arrays.copyOf(RETURN_CODES, 20);
         int[] latencies = Arrays.copyOf(LATENCIES, 20);
@@ -120,13 +129,14 @@
         mCallbackCaptor.getValue().onLost(new Network(105));
         log(105, LATENCIES);
 
-        verifyLoggedEvents(
+        verifyLoggedDnsEvents(
             new DnsEvent(105, eventTypes, returnCodes, latencies),
             new DnsEvent(105, EVENT_TYPES, RETURN_CODES, LATENCIES),
             new DnsEvent(105, EVENT_TYPES, RETURN_CODES, LATENCIES));
     }
 
-    public void testConcurrentBatchesAndDumps() throws Exception {
+    @SmallTest
+    public void testConcurrentDnsBatchesAndDumps() throws Exception {
         final long stop = System.currentTimeMillis() + 100;
         final PrintWriter pw = new PrintWriter(new FileOutputStream("/dev/null"));
         new Thread() {
@@ -137,26 +147,120 @@
             }
         }.start();
 
-        logAsync(105, LATENCIES);
-        logAsync(106, LATENCIES);
-        logAsync(107, LATENCIES);
+        logDnsAsync(105, LATENCIES);
+        logDnsAsync(106, LATENCIES);
+        logDnsAsync(107, LATENCIES);
 
-        verifyLoggedEvents(500,
+        verifyLoggedDnsEvents(500,
             new DnsEvent(105, EVENT_TYPES, RETURN_CODES, LATENCIES),
             new DnsEvent(106, EVENT_TYPES, RETURN_CODES, LATENCIES),
             new DnsEvent(107, EVENT_TYPES, RETURN_CODES, LATENCIES));
     }
 
-    public void testConcurrentBatchesAndNetworkLoss() throws Exception {
-        logAsync(105, LATENCIES);
+    @SmallTest
+    public void testConcurrentDnsBatchesAndNetworkLoss() throws Exception {
+        logDnsAsync(105, LATENCIES);
         Thread.sleep(10L);
-        // call onLost() asynchronously to logAsync's onDnsEvent() calls.
+        // call onLost() asynchronously to logDnsAsync's onDnsEvent() calls.
         mCallbackCaptor.getValue().onLost(new Network(105));
 
         // do not verify unpredictable batch
         verify(mLog, timeout(500).times(1)).log(any());
     }
 
+    @SmallTest
+    public void testConnectLogging() throws Exception {
+        final int OK = 0;
+        Thread[] logActions = {
+            // ignored
+            connectEventAction(OsConstants.EALREADY, 0, EXAMPLE_IPV4),
+            connectEventAction(OsConstants.EALREADY, 0, EXAMPLE_IPV6),
+            connectEventAction(OsConstants.EINPROGRESS, 0, EXAMPLE_IPV4),
+            connectEventAction(OsConstants.EINPROGRESS, 0, EXAMPLE_IPV6),
+            connectEventAction(OsConstants.EINPROGRESS, 0, EXAMPLE_IPV6),
+            // valid latencies
+            connectEventAction(OK, 110, EXAMPLE_IPV4),
+            connectEventAction(OK, 23, EXAMPLE_IPV4),
+            connectEventAction(OK, 45, EXAMPLE_IPV4),
+            connectEventAction(OK, 56, EXAMPLE_IPV4),
+            connectEventAction(OK, 523, EXAMPLE_IPV6),
+            connectEventAction(OK, 214, EXAMPLE_IPV6),
+            connectEventAction(OK, 67, EXAMPLE_IPV6),
+            // errors
+            connectEventAction(OsConstants.EPERM, 0, EXAMPLE_IPV4),
+            connectEventAction(OsConstants.EPERM, 0, EXAMPLE_IPV4),
+            connectEventAction(OsConstants.EAGAIN, 0, EXAMPLE_IPV4),
+            connectEventAction(OsConstants.EACCES, 0, EXAMPLE_IPV4),
+            connectEventAction(OsConstants.EACCES, 0, EXAMPLE_IPV4),
+            connectEventAction(OsConstants.EACCES, 0, EXAMPLE_IPV6),
+            connectEventAction(OsConstants.EADDRINUSE, 0, EXAMPLE_IPV4),
+            connectEventAction(OsConstants.ETIMEDOUT, 0, EXAMPLE_IPV4),
+            connectEventAction(OsConstants.ETIMEDOUT, 0, EXAMPLE_IPV6),
+            connectEventAction(OsConstants.ETIMEDOUT, 0, EXAMPLE_IPV6),
+            connectEventAction(OsConstants.ECONNREFUSED, 0, EXAMPLE_IPV4),
+        };
+
+        for (Thread t : logActions) {
+            t.start();
+        }
+        for (Thread t : logActions) {
+            t.join();
+        }
+
+        List<IpConnectivityEvent> events = new ArrayList<>();
+        mNetdEventListenerService.flushStatistics(events);
+
+        IpConnectivityEvent got = events.get(0);
+        String want = joinLines(
+                "time_ms: 0",
+                "transport: 0",
+                "connect_statistics <",
+                "  connect_count: 12",
+                "  errnos_counters <",
+                "    key: 1",
+                "    value: 2",
+                "  >",
+                "  errnos_counters <",
+                "    key: 11",
+                "    value: 1",
+                "  >",
+                "  errnos_counters <",
+                "    key: 13",
+                "    value: 3",
+                "  >",
+                "  errnos_counters <",
+                "    key: 98",
+                "    value: 1",
+                "  >",
+                "  errnos_counters <",
+                "    key: 110",
+                "    value: 3",
+                "  >",
+                "  errnos_counters <",
+                "    key: 111",
+                "    value: 1",
+                "  >",
+                "  ipv6_addr_count: 6",
+                "  latencies_ms: 23",
+                "  latencies_ms: 45",
+                "  latencies_ms: 56",
+                "  latencies_ms: 67",
+                "  latencies_ms: 110",
+                "  latencies_ms: 214",
+                "  latencies_ms: 523");
+        verifyConnectEvent(want, got);
+    }
+
+    Thread connectEventAction(int error, int latencyMs, String ipAddr) {
+        return new Thread(() -> {
+            try {
+                mNetdEventListenerService.onConnectEvent(100, error, latencyMs, ipAddr, 80, 1);
+            } catch (Exception e) {
+                fail(e.toString());
+            }
+        });
+    }
+
     void log(int netId, int[] latencies) {
         try {
             for (int l : latencies) {
@@ -168,7 +272,7 @@
         }
     }
 
-    void logAsync(int netId, int[] latencies) {
+    void logDnsAsync(int netId, int[] latencies) {
         new Thread() {
             public void run() {
                 log(netId, latencies);
@@ -176,15 +280,15 @@
         }.start();
     }
 
-    void verifyLoggedEvents(DnsEvent... expected) {
-        verifyLoggedEvents(0, expected);
+    void verifyLoggedDnsEvents(DnsEvent... expected) {
+        verifyLoggedDnsEvents(0, expected);
     }
 
-    void verifyLoggedEvents(int wait, DnsEvent... expectedEvents) {
-        verify(mLog, timeout(wait).times(expectedEvents.length)).log(mEvCaptor.capture());
-        for (DnsEvent got : mEvCaptor.getAllValues()) {
+    void verifyLoggedDnsEvents(int wait, DnsEvent... expectedEvents) {
+        verify(mLog, timeout(wait).times(expectedEvents.length)).log(mDnsEvCaptor.capture());
+        for (DnsEvent got : mDnsEvCaptor.getAllValues()) {
             OptionalInt index = IntStream.range(0, expectedEvents.length)
-                    .filter(i -> eventsEqual(expectedEvents[i], got))
+                    .filter(i -> dnsEventsEqual(expectedEvents[i], got))
                     .findFirst();
             // Don't match same expected event more than once.
             index.ifPresent(i -> expectedEvents[i] = null);
@@ -193,11 +297,30 @@
     }
 
     /** equality function for DnsEvent to avoid overriding equals() and hashCode(). */
-    static boolean eventsEqual(DnsEvent expected, DnsEvent got) {
+    static boolean dnsEventsEqual(DnsEvent expected, DnsEvent got) {
         return (expected == got) || ((expected != null) && (got != null)
                 && (expected.netId == got.netId)
                 && Arrays.equals(expected.eventTypes, got.eventTypes)
                 && Arrays.equals(expected.returnCodes, got.returnCodes)
                 && Arrays.equals(expected.latenciesMs, got.latenciesMs));
     }
+
+    static String joinLines(String ... elems) {
+        StringBuilder b = new StringBuilder();
+        for (String s : elems) {
+            b.append(s).append("\n");
+        }
+        return b.toString();
+    }
+
+    static void verifyConnectEvent(String expected, IpConnectivityEvent got) {
+        try {
+            Arrays.sort(got.connectStatistics.latenciesMs);
+            Arrays.sort(got.connectStatistics.errnosCounters,
+                    Comparator.comparingInt((p) -> p.key));
+            assertEquals(expected, got.toString());
+        } catch (Exception e) {
+            fail(e.toString());
+        }
+    }
 }