Add support for "sendheaders" message (BIP130) and use protocol version to 70012.

For now, we're ignoring this message as bitcoinj does not relay blocks.

core/src/main/java/org/bitcoinj/core/BitcoinSerializer.java

@@ -71,6 +71,7 @@ public class BitcoinSerializer extends MessageSerializer {
         names.put(RejectMessage.class, "reject");
         names.put(GetUTXOsMessage.class, "getutxos");
         names.put(UTXOsMessage.class, "utxos");
+        names.put(SendHeadersMessage.class, "sendheaders");
     }
 
     /**
@@ -229,6 +230,8 @@ public class BitcoinSerializer extends MessageSerializer {
             return new UTXOsMessage(params, payloadBytes);
         } else if (command.equals("getutxos")) {
             return new GetUTXOsMessage(params, payloadBytes);
+        } else if (command.equals("sendheaders")) {
+            return new SendHeadersMessage(params, payloadBytes);
         } else {
             log.warn("No support for deserializing message with name {}", command);
             return new UnknownMessage(params, command, payloadBytes);

core/src/main/java/org/bitcoinj/core/NetworkParameters.java

@@ -527,7 +527,7 @@ public abstract class NetworkParameters {
         MINIMUM(70000),
         PONG(60001),
         BLOOM_FILTER(70000),
-        CURRENT(70002);
+        CURRENT(70012);
 
         private final int bitcoinProtocol;
 

core/src/main/java/org/bitcoinj/core/SendHeadersMessage.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2017 Anton Kumaigorodski
+ *
+ * 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.bitcoinj.core;
+
+/**
+ * <p>
+ * A new message, "sendheaders", which indicates that a node prefers to receive new block announcements via a "headers"
+ * message rather than an "inv".
+ * </p>
+ *
+ * <p>
+ * See <a href="https://github.com/bitcoin/bips/blob/master/bip-0130.mediawiki">BIP 130</a>.
+ * </p>
+ */
+public class SendHeadersMessage extends EmptyMessage {
+    public SendHeadersMessage() {
+    }
+
+    // this is needed by the BitcoinSerializer
+    public SendHeadersMessage(NetworkParameters params, byte[] payload) {
+    }
+}

core/src/test/java/org/bitcoinj/core/SendHeadersMessageTest.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2017 Anton Kumaigorodski
+ *
+ * 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.bitcoinj.core;
+
+import org.bitcoinj.params.RegTestParams;
+import org.junit.Test;
+
+import java.nio.ByteBuffer;
+
+import static org.bitcoinj.core.Utils.HEX;
+import static org.junit.Assert.assertTrue;
+
+public class SendHeadersMessageTest {
+    @Test
+    public void decodeAndEncode() throws Exception {
+        byte[] message = HEX
+                .decode("00000000fabfb5da73656e646865616465727300000000005df6e0e2fabfb5da70696e670000000000000000080000009a"
+                        + "65b9cc9840c9729e4502b200000000000000000000000000000d000000000000000000000000000000000000000000000000007ad82"
+                        + "872c28ac782102f5361746f7368693a302e31342e312fe41d000001fabfb5da76657261636b000000000000000000005df6e0e2fabf"
+                        + "b5da616c65727400000000000000a80000001bf9aaea60010000000000000000000000ffffff7f00000000ffffff7ffeffff7f01fff"
+                        + "fff7f00000000ffffff7f00ffffff7f002f555247454e543a20416c657274206b657920636f6d70726f6d697365642c207570677261"
+                        + "6465207265717569726564004630440220653febd6410f470f6bae11cad19c48413becb1ac2c17f908fd0fd53bdc3abd5202206d0e9"
+                        + "c96fe88d4a0f01ed9dedae2b6f9e00da94cad0fecaae66ecf689bf71b50000000000000000000000000000000000000000000000000");
+
+        ByteBuffer buffer = ByteBuffer.wrap(message);
+        RegTestParams params = org.bitcoinj.params.RegTestParams.get();
+        BitcoinSerializer serializer = new BitcoinSerializer(params, false);
+        assertTrue(serializer.deserialize(buffer) instanceof org.bitcoinj.core.SendHeadersMessage);
+    }
+}