diff --git a/blog/2023-02-27-protos/Logs$AndroidCheckinProto.java b/blog/2023-02-27-protos/Logs$AndroidCheckinProto.java
new file mode 100644
index 0000000..7990e48
--- /dev/null
+++ b/blog/2023-02-27-protos/Logs$AndroidCheckinProto.java
@@ -0,0 +1,308 @@
+package com.google.android.gsf.checkin.proto;
+
+import com.google.protobuf.micro.CodedInputStreamMicro;
+import com.google.protobuf.micro.CodedOutputStreamMicro;
+import com.google.protobuf.micro.MessageMicro;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+/* loaded from: classes.dex */
+public final class Logs$AndroidCheckinProto extends MessageMicro {
+    private boolean hasBuild;
+    private boolean hasCellOperator;
+    private boolean hasLastCheckinMsec;
+    private boolean hasRoaming;
+    private boolean hasSimOperator;
+    private boolean hasUserNumber;
+    private Logs$AndroidBuildProto build_ = null;
+    private long lastCheckinMsec_ = 0;
+    private List<String> requestedGroup_ = Collections.emptyList();
+    private List<Logs$AndroidEventProto> event_ = Collections.emptyList();
+    private List<Logs$AndroidStatisticProto> stat_ = Collections.emptyList();
+    private String cellOperator_ = "";
+    private String simOperator_ = "";
+    private String roaming_ = "";
+    private int userNumber_ = 0;
+    private int cachedSize = -1;
+
+    public boolean hasBuild() {
+        return this.hasBuild;
+    }
+
+    public Logs$AndroidBuildProto getBuild() {
+        return this.build_;
+    }
+
+    public Logs$AndroidCheckinProto setBuild(Logs$AndroidBuildProto value) {
+        if (value == null) {
+            throw new NullPointerException();
+        }
+        this.hasBuild = true;
+        this.build_ = value;
+        return this;
+    }
+
+    public long getLastCheckinMsec() {
+        return this.lastCheckinMsec_;
+    }
+
+    public boolean hasLastCheckinMsec() {
+        return this.hasLastCheckinMsec;
+    }
+
+    public Logs$AndroidCheckinProto setLastCheckinMsec(long value) {
+        this.hasLastCheckinMsec = true;
+        this.lastCheckinMsec_ = value;
+        return this;
+    }
+
+    public List<String> getRequestedGroupList() {
+        return this.requestedGroup_;
+    }
+
+    public Logs$AndroidCheckinProto addRequestedGroup(String value) {
+        if (value == null) {
+            throw new NullPointerException();
+        }
+        if (this.requestedGroup_.isEmpty()) {
+            this.requestedGroup_ = new ArrayList();
+        }
+        this.requestedGroup_.add(value);
+        return this;
+    }
+
+    public List<Logs$AndroidEventProto> getEventList() {
+        return this.event_;
+    }
+
+    public int getEventCount() {
+        return this.event_.size();
+    }
+
+    public Logs$AndroidEventProto getEvent(int index) {
+        return this.event_.get(index);
+    }
+
+    public Logs$AndroidCheckinProto addEvent(Logs$AndroidEventProto value) {
+        if (value == null) {
+            throw new NullPointerException();
+        }
+        if (this.event_.isEmpty()) {
+            this.event_ = new ArrayList();
+        }
+        this.event_.add(value);
+        return this;
+    }
+
+    public List<Logs$AndroidStatisticProto> getStatList() {
+        return this.stat_;
+    }
+
+    public Logs$AndroidCheckinProto addStat(Logs$AndroidStatisticProto value) {
+        if (value == null) {
+            throw new NullPointerException();
+        }
+        if (this.stat_.isEmpty()) {
+            this.stat_ = new ArrayList();
+        }
+        this.stat_.add(value);
+        return this;
+    }
+
+    public String getCellOperator() {
+        return this.cellOperator_;
+    }
+
+    public boolean hasCellOperator() {
+        return this.hasCellOperator;
+    }
+
+    public Logs$AndroidCheckinProto setCellOperator(String value) {
+        this.hasCellOperator = true;
+        this.cellOperator_ = value;
+        return this;
+    }
+
+    public String getSimOperator() {
+        return this.simOperator_;
+    }
+
+    public boolean hasSimOperator() {
+        return this.hasSimOperator;
+    }
+
+    public Logs$AndroidCheckinProto setSimOperator(String value) {
+        this.hasSimOperator = true;
+        this.simOperator_ = value;
+        return this;
+    }
+
+    public String getRoaming() {
+        return this.roaming_;
+    }
+
+    public boolean hasRoaming() {
+        return this.hasRoaming;
+    }
+
+    public Logs$AndroidCheckinProto setRoaming(String value) {
+        this.hasRoaming = true;
+        this.roaming_ = value;
+        return this;
+    }
+
+    public int getUserNumber() {
+        return this.userNumber_;
+    }
+
+    public boolean hasUserNumber() {
+        return this.hasUserNumber;
+    }
+
+    public Logs$AndroidCheckinProto setUserNumber(int value) {
+        this.hasUserNumber = true;
+        this.userNumber_ = value;
+        return this;
+    }
+
+    public final boolean isInitialized() {
+        for (Logs$AndroidEventProto element : getEventList()) {
+            if (!element.isInitialized()) {
+                return false;
+            }
+        }
+        for (Logs$AndroidStatisticProto element2 : getStatList()) {
+            if (!element2.isInitialized()) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    @Override // com.google.protobuf.micro.MessageMicro
+    public void writeTo(CodedOutputStreamMicro output) throws IOException {
+        if (hasBuild()) {
+            output.writeMessage(1, getBuild());
+        }
+        if (hasLastCheckinMsec()) {
+            output.writeInt64(2, getLastCheckinMsec());
+        }
+        for (Logs$AndroidEventProto element : getEventList()) {
+            output.writeMessage(3, element);
+        }
+        for (Logs$AndroidStatisticProto element2 : getStatList()) {
+            output.writeMessage(4, element2);
+        }
+        for (String element3 : getRequestedGroupList()) {
+            output.writeString(5, element3);
+        }
+        if (hasCellOperator()) {
+            output.writeString(6, getCellOperator());
+        }
+        if (hasSimOperator()) {
+            output.writeString(7, getSimOperator());
+        }
+        if (hasRoaming()) {
+            output.writeString(8, getRoaming());
+        }
+        if (!hasUserNumber()) {
+            return;
+        }
+        output.writeInt32(9, getUserNumber());
+    }
+
+    @Override // com.google.protobuf.micro.MessageMicro
+    public int getCachedSize() {
+        if (this.cachedSize < 0) {
+            getSerializedSize();
+        }
+        return this.cachedSize;
+    }
+
+    @Override // com.google.protobuf.micro.MessageMicro
+    public int getSerializedSize() {
+        int size = 0;
+        if (hasBuild()) {
+            size = CodedOutputStreamMicro.computeMessageSize(1, getBuild()) + 0;
+        }
+        if (hasLastCheckinMsec()) {
+            size += CodedOutputStreamMicro.computeInt64Size(2, getLastCheckinMsec());
+        }
+        for (Logs$AndroidEventProto element : getEventList()) {
+            size += CodedOutputStreamMicro.computeMessageSize(3, element);
+        }
+        for (Logs$AndroidStatisticProto element2 : getStatList()) {
+            size += CodedOutputStreamMicro.computeMessageSize(4, element2);
+        }
+        int dataSize = 0;
+        for (String element3 : getRequestedGroupList()) {
+            dataSize += CodedOutputStreamMicro.computeStringSizeNoTag(element3);
+        }
+        int size2 = size + dataSize + (getRequestedGroupList().size() * 1);
+        if (hasCellOperator()) {
+            size2 += CodedOutputStreamMicro.computeStringSize(6, getCellOperator());
+        }
+        if (hasSimOperator()) {
+            size2 += CodedOutputStreamMicro.computeStringSize(7, getSimOperator());
+        }
+        if (hasRoaming()) {
+            size2 += CodedOutputStreamMicro.computeStringSize(8, getRoaming());
+        }
+        if (hasUserNumber()) {
+            size2 += CodedOutputStreamMicro.computeInt32Size(9, getUserNumber());
+        }
+        this.cachedSize = size2;
+        return size2;
+    }
+
+    @Override // com.google.protobuf.micro.MessageMicro
+    public Logs$AndroidCheckinProto mergeFrom(CodedInputStreamMicro input) throws IOException {
+        while (true) {
+            int tag = input.readTag();
+            switch (tag) {
+                case 0:
+                    return this;
+                case 10:
+                    Logs$AndroidBuildProto value = new Logs$AndroidBuildProto();
+                    input.readMessage(value);
+                    setBuild(value);
+                    break;
+                case 16:
+                    setLastCheckinMsec(input.readInt64());
+                    break;
+                case 26:
+                    Logs$AndroidEventProto value2 = new Logs$AndroidEventProto();
+                    input.readMessage(value2);
+                    addEvent(value2);
+                    break;
+                case 34:
+                    Logs$AndroidStatisticProto value3 = new Logs$AndroidStatisticProto();
+                    input.readMessage(value3);
+                    addStat(value3);
+                    break;
+                case 42:
+                    addRequestedGroup(input.readString());
+                    break;
+                case 50:
+                    setCellOperator(input.readString());
+                    break;
+                case 58:
+                    setSimOperator(input.readString());
+                    break;
+                case 66:
+                    setRoaming(input.readString());
+                    break;
+                case 72:
+                    setUserNumber(input.readInt32());
+                    break;
+                default:
+                    if (parseUnknownField(input, tag)) {
+                        break;
+                    } else {
+                        return this;
+                    }
+            }
+        }
+    }
+}
diff --git a/checkin.go b/checkin.go
index 3298f19..5dc0ebd 100644
--- a/checkin.go
+++ b/checkin.go
@@ -90,6 +90,7 @@ func (c Config) Checkin(native_platform string) (*Response, error) {
    req_body := protobuf.Message{
       4: protobuf.Message{ // checkin
          1: protobuf.Message{ // build
+            // Logs$AndroidBuildProto.java
             // sdkVersion
             // multiple APK valid range 14 - 0x7FFF_FFFF
             // single APK valid range 14 - 28