test(core): only start Tropic model if the Trezor emulator needs it

diff --git a/core/emu.py b/core/emu.py
index 5c968c20..06bb3feb 100755
--- a/core/emu.py
+++ b/core/emu.py
@@ -143,7 +143,7 @@ def _from_env(name: str) -> bool:
 @click.option("-s", "--slip0014", is_flag=True, help="Initialize device with SLIP-14 seed (all all all...)")
 @click.option("-S", "--script-gdb-file", type=click.Path(exists=True, dir_okay=False), help="Run gdb with an init file")
 @click.option("-t", "--temporary-profile", is_flag=True, help="Create an empty temporary profile")
-@click.option("--tropic-emulator/--no-tropic-emulator", default=True, help="Start Tropic01 model")
+@click.option("--tropic-emulator/--no-tropic-emulator", default=None, help="Start Tropic01 model")
 @click.option("--tropic-emulator-config", type=click.Path(exists=True, dir_okay=False), default=TROPIC_MODEL_CONFIG, help="Tropic01 model configuration file")
 @click.option("-V", "--valgrind", is_flag=True, help="Use valgrind instead of debugger (-D)")
 @click.option("-w", "--watch", is_flag=True, help="Restart emulator if sources change")
@@ -172,7 +172,7 @@ def cli(
     slip0014: bool,
     script_gdb_file: str | Path | None,
     temporary_profile: bool,
-    tropic_emulator: bool,
+    tropic_emulator: bool | None,
     tropic_emulator_config: Path,
     valgrind: bool,
     watch: bool,
@@ -299,6 +299,8 @@ def cli(
         os.environ["TREZOR_MEMPERF"] = "1"
 
     tropic_model = None
+    if tropic_emulator is None:
+        tropic_emulator = emulator.properties().get("tropic", False)
     if tropic_emulator:
         tropic_model = TropicModel(
             profile_dir=str(profile_dir),
diff --git a/tests/conftest.py b/tests/conftest.py
index fdbd432d..04696c97 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -96,8 +96,19 @@ def _get_worker_id(request: pytest.FixtureRequest) -> int:
 
 
 @pytest.fixture(scope="session")
-def tropic_model(request: pytest.FixtureRequest) -> t.Iterator[TropicModel]:
+def tropic_model_port(request: pytest.FixtureRequest) -> t.Iterator[int | None]:
+    """Fixture that starts Tropic01 model and returns the TCP port it's running on.
+    It returns None if the currently tested emulator does not need it."""
     worker_id = _get_worker_id(request)
+
+    emulator_wrapper = EmulatorWrapper(
+        request.session.config.getoption("model") or "core"
+    )
+    if not emulator_wrapper.executable_is_tropic_capable():
+        LOG.debug(f"Not starting tropic model (worker {worker_id})")
+        yield None
+        return
+
     logfile = get_logfile(f"trezor-tropic-model-{worker_id}.log")
     port = get_tropic_model_port(worker_id)
 
@@ -114,18 +125,18 @@ def tropic_model(request: pytest.FixtureRequest) -> t.Iterator[TropicModel]:
             logfile=logfile,
         ) as tropic_model:
             tropic_model.start()
-            yield tropic_model
+            yield tropic_model.port
 
 
 @pytest.fixture
 def core_emulator(
-    tropic_model: TropicModel, request: pytest.FixtureRequest
+    tropic_model_port: int | None, request: pytest.FixtureRequest
 ) -> t.Iterator[Emulator]:
     """Fixture returning default core emulator with possibility of screen recording."""
     with EmulatorWrapper(
         "core",
         main_args=_emulator_wrapper_main_args(),
-        tropic_model_port=tropic_model.port,
+        tropic_model_port=tropic_model_port,
     ) as emu:
         # Modifying emu.client to add screen recording (when --ui=test is used)
         _check_protocol(request, emu.client)
@@ -135,7 +146,7 @@ def core_emulator(
 
 @pytest.fixture(scope="session")
 def emulator(
-    tropic_model: TropicModel, request: pytest.FixtureRequest
+    tropic_model_port: int | None, request: pytest.FixtureRequest
 ) -> t.Generator["Emulator", None, None]:
     """Fixture for getting emulator connection in case tests should operate it on their own.
 
@@ -171,7 +182,7 @@ def emulator(
         headless=True,
         auto_interact=not interact,
         main_args=_emulator_wrapper_main_args(),
-        tropic_model_port=tropic_model.port,
+        tropic_model_port=tropic_model_port,
     ) as emu:
         yield emu
 
diff --git a/tests/emulators.py b/tests/emulators.py
index d1bca6bb..73c9c855 100644
--- a/tests/emulators.py
+++ b/tests/emulators.py
@@ -233,6 +233,10 @@ class EmulatorWrapper:
                 f"Unrecognized gen - {gen} - only 'core' and 'legacy' supported"
             )
 
+    def executable_is_tropic_capable(self) -> bool:
+        """Try running the binary with --emulator-properties to see if it is Tropic capable."""
+        return self.emulator.properties().get("tropic", False)
+
     def __enter__(self) -> Emulator:
         self.emulator.start()
         return self.emulator