implemented getTransactionToApprove command request

src/main/java/jota/IotaAPIProxy.java

@@ -8,9 +8,11 @@ import java.util.Arrays;
 import java.util.Collection;
 import java.util.Optional;
 import java.util.Properties;
+import java.util.concurrent.TimeUnit;
 
 import jota.dto.request.*;
 import jota.dto.response.*;
+import okhttp3.OkHttpClient;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -51,9 +53,15 @@ public class IotaAPIProxy {
 
         final String nodeUrl = protocol + "://" + host + ":" + port;
 
+        final OkHttpClient client = new OkHttpClient.Builder()
+                .readTimeout(120, TimeUnit.SECONDS)
+                .connectTimeout(120, TimeUnit.SECONDS)
+                .build();
+
         final Retrofit retrofit = new Retrofit.Builder()
                 .baseUrl(nodeUrl)
                 .addConverterFactory(GsonConverterFactory.create())
+                .client(client)
                 .build();
 
         service = retrofit.create(IotaAPIService.class);
@@ -148,6 +156,10 @@ public class IotaAPIProxy {
         return wrapCheckedException(res).body();
     }
 
+    public GetTransactionsToApproveResponse getTransactionsToApprove(String milestone) {
+        final Call<GetTransactionsToApproveResponse> res = service.getTransactionsToApprove(IotaGetTransactionsToApproveRequest.createIotaGetTransactionsToApproveRequest(milestone));
+        return wrapCheckedException(res).body();
+    }
 
 
     protected static <T> Response<T> wrapCheckedException(final Call<T> call) {

src/main/java/jota/IotaAPIService.java

@@ -140,11 +140,19 @@ public interface IotaAPIService {
     @Headers({ CONTENT_TYPE_HEADER, USER_AGENT_HEADER })
     @POST("./")
     Call<PrepareTransfersResponse> prepareTransfers(@Body IotaPrepareTransfersRequest request);
+    */
 
+    /**
+     * Tip selection which returns trunkTransaction and branchTransaction. The input value is the latest coordinator milestone, as provided through the getNodeInfo API call.
+     *
+     * curl http://localhost:14265 -X POST -H 'Content-Type: application/json'
+     * -d '{"command": "getTransactionsToApprove", "milestone": "SMYMAKKPSUKCKDRUEYCGZJTYCZ9HHDMDUWBAPXARGURPQRHTAJDASRWMIDTPTBNDKDEFBUTBGGAFX9999"}'
+     */
     @Headers({ CONTENT_TYPE_HEADER, USER_AGENT_HEADER })
     @POST("./")
     Call<GetTransactionsToApproveResponse> getTransactionsToApprove(@Body IotaGetTransactionsToApproveRequest request);
 
+    /*
     @Headers({ CONTENT_TYPE_HEADER, USER_AGENT_HEADER })
     @POST("./")
     Call<GetAttachToTangleResponse> attachToTangle(@Body IotaAttachToTangleRequest request);

src/main/java/jota/dto/request/IotaGetTransactionsToApproveRequest.java

@@ -0,0 +1,17 @@
+package jota.dto.request;
+
+import jota.IotaAPICommands;
+
+public class IotaGetTransactionsToApproveRequest extends IotaCommandRequest {
+
+    private String milestone;
+
+    private IotaGetTransactionsToApproveRequest(final String milestone) {
+        super(IotaAPICommands.GET_TRANSACTIONS_TO_APPROVE);
+        this.milestone = milestone;
+    }
+
+    public static IotaGetTransactionsToApproveRequest createIotaGetTransactionsToApproveRequest(String milestone) {
+        return new IotaGetTransactionsToApproveRequest(milestone);
+    }
+}

src/main/java/jota/dto/response/GetTransactionsToApproveResponse.java

@@ -0,0 +1,14 @@
+package jota.dto.response;
+
+public class GetTransactionsToApproveResponse extends AbstractResponse {
+
+    private String trunkTransaction;
+    private String branchTransaction;
+
+    public String getBranchTransaction() {
+        return branchTransaction;
+    }
+    public String getTrunkTransaction() {
+        return trunkTransaction;
+    }
+}