Checkin can be used

... but resulting android id is probably unusable as it's not providing features :)

AndroidManifest.xml

@@ -84,6 +84,24 @@
 
         <!-- Device Checkin -->
 
+        <service android:name="org.microg.gms.checkin.CheckinService" />
+
+        <receiver android:name="org.microg.gms.checkin.TriggerReceiver">
+            <intent-filter>
+                <action android:name="android.server.checkin.CHECKIN" />
+            </intent-filter>
+            <intent-filter>
+                <action android:name="com.google.android.c2dm.intent.RECEIVE" />
+                <category android:name="android.server.checkin.CHECKIN" />
+            </intent-filter>
+            <intent-filter>
+                <action android:name="android.provider.Telephony.SECRET_CODE" />
+                <data
+                    android:host="2432546"
+                    android:scheme="android_secret_code" />
+            </intent-filter>
+        </receiver>
+
         <!-- Cloud Messaging -->
         <service
             android:name="org.microg.gms.gcm.PushRegisterService"

src/org/microg/gms/checkin/CheckinClient.java

@@ -126,11 +126,9 @@ public class CheckinClient {
                 .deviceConfiguration(deviceConfig)
                 .digest(checkinInfo.digest)
                 .esn(deviceIdent.esn)
-                .fragment((Integer) TODO)
+                .fragment(0)
                 .locale((String) TODO)
                 .loggingId((Long) TODO)
-                .macAddress(Arrays.asList(deviceIdent.wifiMac))
-                .macAddressType(Arrays.asList("wifi"))
                 .meid(deviceIdent.meid)
                 .otaCert((List<String>) TODO)
                 .serial((String) TODO)
@@ -138,7 +136,14 @@ public class CheckinClient {
                 .userName((String) TODO)
                 .userSerialNumber((Integer) TODO)
                 .version(3);
-        if (checkinInfo.securityToken != 0) builder.securityToken(checkinInfo.securityToken);
+        if (deviceIdent.wifiMac != null) {
+            builder.macAddress(Arrays.asList(deviceIdent.wifiMac))
+                    .macAddressType(Arrays.asList("wifi"));
+        }
+        if (checkinInfo.securityToken != 0) {
+            builder.securityToken(checkinInfo.securityToken)
+                    .fragment(1);
+        }
         return builder.build();
 
     }

src/org/microg/gms/checkin/CheckinManager.java

@@ -19,6 +19,9 @@ package org.microg.gms.checkin;
 import android.content.ContentResolver;
 import android.content.Context;
 
+import org.microg.gms.common.DeviceConfiguration;
+import org.microg.gms.common.DeviceIdentifier;
+import org.microg.gms.common.PhoneInfo;
 import org.microg.gms.common.Utils;
 import org.microg.gms.gservices.GServices;
 
@@ -30,7 +33,7 @@ public class CheckinManager {
     public static synchronized LastCheckinInfo checkin(Context context) throws IOException {
         LastCheckinInfo info = LastCheckinInfo.read(context);
         if (info.lastCheckin > System.currentTimeMillis() - MIN_CHECKIN_INTERVAL) return null;
-        CheckinRequest request = CheckinClient.makeRequest(Utils.getBuild(context), null, null, null, info); // TODO
+        CheckinRequest request = CheckinClient.makeRequest(Utils.getBuild(context), new DeviceConfiguration(), new DeviceIdentifier(), new PhoneInfo(), info); // TODO
         return handleResponse(context, CheckinClient.request(request));
     }
 

src/org/microg/gms/checkin/CheckinService.java

@@ -24,7 +24,6 @@ import java.io.IOException;
 
 public class CheckinService extends IntentService {
     private static final String TAG = "GmsCheckinService";
-    public static final String CHECKIN_ACTION = "com.google.android.gsf.checkin.CHECKIN";
 
     public CheckinService() {
         super(TAG);
@@ -32,15 +31,14 @@ public class CheckinService extends IntentService {
 
     @Override
     protected void onHandleIntent(Intent intent) {
-        if (CHECKIN_ACTION.equals(intent.getAction())) {
-            try {
-                LastCheckinInfo info = CheckinManager.checkin(this);
-                if (info != null) {
-                    Log.d(TAG, "Checked in as " + Long.toHexString(info.androidId));
-                }
-            } catch (IOException e) {
-                Log.w(TAG, e);
+        try {
+            LastCheckinInfo info = CheckinManager.checkin(this);
+            if (info != null) {
+                Log.d(TAG, "Checked in as " + Long.toHexString(info.androidId));
             }
+        } catch (Exception e) {
+            Log.w(TAG, e);
         }
+        stopSelf();
     }
 }

src/org/microg/gms/checkin/TriggerReceiver.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2013-2015 µg Project Team
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.microg.gms.checkin;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.util.Log;
+
+public class TriggerReceiver extends BroadcastReceiver {
+    private static final String TAG = "GmsCheckinTrigger";
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        Log.d(TAG, "Trigger checkin: " + intent);
+        context.startService(new Intent(context, CheckinService.class));
+    }
+}