Add bulk MXAccess subscription commands

clients/python/tests/test_client_session.py

@@ -58,6 +58,41 @@ async def test_mxaccess_error_preserves_raw_reply() -> None:
     assert captured.value.raw_reply is failure_reply
 
 
+@pytest.mark.asyncio
+async def test_subscribe_bulk_sends_one_bulk_command_and_returns_results() -> None:
+    stub = FakeGatewayStub()
+    bulk_reply = pb.MxCommandReply(
+        session_id="session-1",
+        kind=pb.MX_COMMAND_KIND_SUBSCRIBE_BULK,
+        protocol_status=pb.ProtocolStatus(code=pb.PROTOCOL_STATUS_CODE_OK),
+        subscribe_bulk=pb.BulkSubscribeReply(
+            results=[
+                pb.SubscribeResult(
+                    server_handle=12,
+                    tag_address="Area001.Pump001.Speed",
+                    item_handle=34,
+                    was_successful=True,
+                ),
+            ],
+        ),
+    )
+    stub.invoke.replies = [bulk_reply]
+    client = await GatewayClient.connect(
+        ClientOptions(endpoint="fake", api_key="mxgw_test_secret", plaintext=True),
+        stub=stub,
+    )
+    session = await client.open_session()
+
+    results = await session.subscribe_bulk(12, ["Area001.Pump001.Speed"])
+
+    assert results[0].item_handle == 34
+    assert len(stub.invoke.requests) == 1
+    assert stub.invoke.requests[0].command.kind == pb.MX_COMMAND_KIND_SUBSCRIBE_BULK
+    assert list(stub.invoke.requests[0].command.subscribe_bulk.tag_addresses) == [
+        "Area001.Pump001.Speed",
+    ]
+
+
 @pytest.mark.asyncio
 async def test_stream_events_cancels_underlying_call_when_closed() -> None:
     stream = FakeStream(