SyncClient: add protocolVersion and protocolVersionServer #159

Author: greenrobot-team

objectbox/lib/src/native/sync.dart

@@ -238,6 +238,13 @@ class SyncClient {
   /// Returns if this sync client is closed and can no longer be used.
   bool isClosed() => _cSync.address == 0;
 
+  /// Returns the protocol version this client uses.
+  static int protocolVersion() => C.sync_protocol_version();
+
+  /// Returns the protocol version of the server after a connection is
+  /// established (or attempted), zero otherwise.
+  int protocolVersionServer() => C.sync_protocol_version_server(_ptr);
+
   /// Gets the current sync client state.
   SyncState state() {
     final state = C.sync_state(_ptr);

objectbox_test/test/sync_test.dart

@@ -99,6 +99,7 @@ void main() {
 
   if (Sync.isAvailable()) {
     // TESTS to run when SYNC is available
+    print("Testing Sync with protocol version ${SyncClient.protocolVersion()}");
 
     test('SyncClient lifecycle', () {
       expect(store.syncClient(), isNull);
@@ -210,6 +211,9 @@ void main() {
       SyncClient c = createClient(store);
       expect(c.isClosed(), isFalse);
 
+      expect(SyncClient.protocolVersion(), greaterThanOrEqualTo(7));
+      expect(c.protocolVersionServer(), 0);
+
       c.setCredentials(SyncCredentials.none());
       c.setCredentials(SyncCredentials.googleAuthString('secret'));
       c.setCredentials(SyncCredentials.sharedSecretString('secret'));