fix: use HM42 vendor image upload session

tests/test_client.py

@@ -101,10 +101,17 @@ class TestCommands:
         )
         assert result["bytes_bw"] == 15000
         assert result["bytes_red"] == 15000
-        assert len(client._t.epd_writes) == 63 + 63 + 1
-        first_red = client._t.epd_writes[63]
+        assert client._t.epd_writes[:3] == [
+            bytes.fromhex("8001"),
+            bytes.fromhex("0000"),
+            bytes.fromhex("020000"),
+        ]
+        assert len(client._t.epd_writes) == 3 + 63 + 63 + 1
+        first_red = client._t.epd_writes[3 + 63]
         assert first_red[:4] == bytes.fromhex("03000000")
         assert set(first_red[4:]) == {0}
+        assert client._t.epd_writes[-1] == bytes.fromhex("0101")
+        assert client._t.rxtx_writes[-1] == bytes.fromhex("e2")
 
     @pytest.mark.asyncio
     async def test_render_template(self, client):