diff --git a/ports/android/app/src/main/java/com/zerotier/libzt/ZeroTier.java b/ports/android/app/src/main/java/com/zerotier/libzt/ZeroTier.java
index c53b40c..8eccfd8 100644
--- a/ports/android/app/src/main/java/com/zerotier/libzt/ZeroTier.java
+++ b/ports/android/app/src/main/java/com/zerotier/libzt/ZeroTier.java
@@ -90,6 +90,16 @@ public class ZeroTier
 	public static int  EVENT_PEER_RELAY                = 97;
 	public static int  EVENT_PEER_UNREACHABLE          = 98;
 
+	//////////////////////////////////////////////////////////////////////////////
+	// ZeroTier Constants                                                       //
+	//////////////////////////////////////////////////////////////////////////////
+
+	public static int  ZT_MAX_PEER_NETWORK_PATHS       = 16;
+
+	//////////////////////////////////////////////////////////////////////////////
+	// Socket API Constants                                                     //
+	//////////////////////////////////////////////////////////////////////////////
+
 	// Socket protocol types
 	public static int SOCK_STREAM     = 0x00000001;
 	public static int SOCK_DGRAM      = 0x00000002;
@@ -166,8 +176,8 @@ public class ZeroTier
 	// ZeroTier Service Controls                                                //
 	//////////////////////////////////////////////////////////////////////////////
 
-	public static native void start(String path, ZeroTierEventListener callbackClass, int port);
-	public static native void stop();
+	public static native int start(String path, ZeroTierEventListener callbackClass, int port);
+	public static native int stop();
 	public static native int join(long nwid);
 	public static native int leave(long nwid);
 	public static native long get_node_id();
diff --git a/src/Controls.cpp b/src/Controls.cpp
index 5719f28..4ffc118 100644
--- a/src/Controls.cpp
+++ b/src/Controls.cpp
@@ -576,7 +576,7 @@ zts_err_t zts_start(const char *path, void (*callback)(struct zts_callback_msg*)
 }
 
 #ifdef SDK_JNI
-JNIEXPORT void JNICALL Java_com_zerotier_libzt_ZeroTier_start(
+JNIEXPORT int JNICALL Java_com_zerotier_libzt_ZeroTier_start(
 	JNIEnv *env, jobject thisObj, jstring path, jobject callback, jint port)
 {
 	if (!path) {
@@ -595,8 +595,9 @@ JNIEXPORT void JNICALL Java_com_zerotier_libzt_ZeroTier_start(
 	objRef = env->NewGlobalRef(callback); // Reference used for later calls
 	_userCallbackMethodRef = eventListenerCallbackMethod;
 	const char* utf_string = env->GetStringUTFChars(path, NULL);
-	zts_start(utf_string, NULL, port); // using _userCallbackMethodRef
+	int retval = zts_start(utf_string, NULL, port); // using _userCallbackMethodRef
 	env->ReleaseStringUTFChars(path, utf_string);
+	return retval;
 }
 #endif